JP7630169B2 - Paddy field water level management schedule generation device, generation program, control device, control method, and control program - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. Website address: https://www.naro.affrc.go.jp/project/results/4th_laboratory/niaes/2018/18_062.html Posted on September 26, 2019. Website address: http://agrmet.jp/samj2020/ Posted on March 9, 2020.

The present invention relates to a device, a method, a program, a control device, a control method, and a control program for generating a water level management schedule for paddy fields.

In recent years, with the development of information technology, techniques for remotely controlling water supply and drainage in rice paddies are being put to practical use. For example, Patent Document 1 discloses a technique for computer-controlled water levels in rice paddies. Patent Document 2 discloses a technique for setting appropriate water levels for rice growth and weather conditions. And Patent Document 3 discloses a system for reserving water supply to a group of fields.

JP 2003-265055 A (Published on September 24, 2003) JP 2000-69865 A (published March 7, 2000) JP 2019-179293 A (published on October 17, 2019)

However, the above-mentioned conventional technology has a problem in that the user cannot change or fine-tune the pattern model of the water level setting value that is pre-installed in the system (Patent Documents 1 to 3).

One aspect of the present invention aims to enable users to create and modify water level management schedules for controlling water supply and drainage to rice paddies and managing the water level of the paddy fields.

In order to solve the above problem, a generating device according to one embodiment of the present invention is a generating device that generates a water level management schedule for controlling water supply and drainage to a rice paddy and managing the water level of the rice paddy, and is configured to receive a water level management schedule created by assigning one or more water management elements selected from a plurality of water management elements with different rice paddy water level management patterns to each of a plurality of divided periods into which a management period for managing the water level of the rice paddy is divided, and includes a modification unit that modifies the rice paddy water level management pattern of the water management elements included in the water level management schedule based on input from a user.

In order to solve the above problems, a generation method according to one aspect of the present invention is a method for generating a water level management schedule for controlling water supply and drainage to a rice paddy and managing the water level of the rice paddy, the method including a step of receiving a water level management schedule created by assigning one or more water management elements selected from a plurality of water management elements with different rice paddy water level management patterns to each of a plurality of divided periods into which a management period for managing the water level of the rice paddy is divided, and changing the rice paddy water level management pattern of the water management elements included in the water level management schedule based on input from a user.

According to one aspect of the present invention, a user can easily create and modify a water level management schedule for controlling water supply and drainage to a rice field and managing the water level of the rice field.

FIG. 1 is a functional block diagram showing the configuration of an automatic water management system equipped with a generating device according to a first embodiment of the present invention. FIG. 2 is a diagram showing a schematic example of a water level management schedule created by the generating device according to the first embodiment of the present invention. 5 is a flowchart illustrating an example of a process of the generating device according to the first embodiment of the present invention. FIG. 13 is a diagram showing an example of a water level management schedule creation screen generated by the generation device according to the first embodiment of the present invention. 5 is a functional block diagram showing the configuration of an automatic water management system equipped with a generating device according to a second embodiment of the present invention. FIG. 11 is a diagram illustrating an overview of water demand prediction in a generation device according to a second embodiment of the present invention. 10 is a flowchart illustrating an example of a process of a generating device according to a second embodiment of the present invention. 11 is a functional block diagram showing the configuration of an automatic water management system equipped with a generating device according to a third embodiment of the present invention. FIG. 13 is a diagram showing an example of a lookup table showing the relationship between weather data, rice development stage, paddy field water level, and optimal water supply time. 13 is a flowchart illustrating an example of a process performed by a generating device according to a third embodiment of the present invention. 5 is a flowchart illustrating an example of a process of the control device according to the first embodiment of the present invention.

[Embodiment 1]
<Configuration>
The configuration of the generating device 30 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a functional block diagram showing the configuration of an automatic water management system 1 including the generating device 30 according to the first embodiment. As shown in Fig. 1, the automatic water management system 1 includes a user terminal 10, a generating device 30, a control device 50, and a water level management system 70.

In the automatic water management system 1, the generating device 30 generates a water level management schedule for controlling water supply and drainage to the rice field based on input from the user on the user terminal 10 to manage the water level of the rice field. The control device 50 accepts the water level management schedule generated by the generating device 30, and controls the water level management system 70 to control the amount of water supply and drainage to the target rice field so that the rice field water level management pattern indicated by the water level management schedule is achieved. At least two of the user terminal 10, the generating device 30, the control device 50, and the water level management system 70 may exist in the same device, and the combination is not particularly limited. For example, the generating device 30 and the control device 50 may exist in the same device, and all of the user terminal 10, the generating device 30, the control device 50, and the water level management system 70 may exist in the same device. Note that the "water level of the rice field" or "water level of the rice field" used in this specification refers to the height from the surface of the rice field to the water surface.

The user terminal 10 is a terminal operated by a user who remotely manages water in rice paddies. As an example, the user terminal 10 is an electronic terminal with a communication function. For example, the user terminal 10 is a smartphone terminal, a PDA terminal, a personal computer terminal, or other electronic terminal.

The water level management system 70 comprises a water supply section that supplies water to the target rice field and a drainage section that drains water from the target rice field. The water level management system 70 is the system that actually controls the water supply and drainage of the water level in the rice field.

The user terminal 10 and the control device 50 can communicate with the generating device 30 via a network. The network connecting them can be, for example, the Internet, a wired LAN (Local Area Network), a wireless LAN, a mobile data communication network, or a combination of these. However, the network configuration is not limited to these. The same is true for the network connecting the control device 50 and the water level management system 70. It is also possible for the user terminal 10 itself to function as a generating device. In this case, the user terminal 10 can function as each part of the generating device 30 described below.

<Function>
The function of each unit according to this embodiment will be described with reference to FIG.

(User terminal 10)
1, the user terminal 10 includes a communication unit 11, a display unit 13, and an input unit 15. The communication unit 11 has a function of the user terminal 10 communicating with the generation device 30. The display unit 13 displays a water level management schedule creation screen to the user. The water level management schedule creation screen will be described later.

The input unit 15 accepts input from the user to the water level management schedule creation screen. The input unit 15 may be, for example, a keyboard, a mouse, a touchpad, a microphone, or a combination of these.

(Generation device 30)
1 , the generating device 30 includes a communication unit 31, a control unit 33, and a storage unit 35. The communication unit 31 has a function of the generating device 30 communicating with the user terminal 10 and the control device 50. The control unit 33 has a function of controlling the processing of the generating device 30. The control unit 33 includes a creation unit 331, a change unit 332, a correction unit 333, and a selection unit 334.

The creation unit 331 creates a water level management schedule based on input from the user. Specifically, based on input from the user, the creation unit 331 assigns one or more water management elements selected from a plurality of water management elements having different paddy field water level management patterns to each of a plurality of divided periods into which the management period for managing the paddy field water level is divided, and creates a water level management schedule for the management period. The "water management elements" and the "water level management schedule" will be described later.

The change unit 332 changes the water level management schedule based on input from the user. Specifically, it changes the management pattern of the paddy field water level of the water management element included in the water level management schedule based on input from the user.

The correction unit 333 receives one or more pieces of information (hereinafter sometimes referred to as "correction unit reference information") selected from the group consisting of the transplanting date of the target rice cultivated in the target paddy field, the temperature at the location where the target paddy field is located, the precipitation at the location where the target paddy field is located, the paddy water level of the target paddy field, the reduced water depth of the target paddy field, and growth prediction information of the target rice cultivated in the target paddy field, and corrects the water level management schedule by referring to the correction unit reference information. Specifically, the correction unit 333 corrects the paddy water level management pattern of the water management element included in the water level management schedule by referring to one or more pieces of correction unit reference information. The correction by the correction unit may be performed automatically, or may be performed based on the user's approval. Each correction unit reference information will be described later. Each correction unit reference information may be obtained from a server or may be stored in advance in the storage unit 35.

The selection unit 334 selects one of a number of pre-created water level management schedules based on input from the user. The selection unit 334 will be described later in a modified example of the first embodiment.

The memory unit 35 stores various information referenced by each part of the control unit 33.

Figure 2 is a schematic diagram showing an example of a water level management schedule. The "water level management schedule" shows the correspondence between water management elements and each of the multiple divided periods into which the management period for managing the water level of rice paddies is divided.

The "management period" for managing the water level of paddy fields is not particularly limited, and can be set as a continuous period starting from the rice transplanting date and ending any number of days (e.g., 10 days) after the maturity date, as in the water level management schedule shown in Figure 2. Also, a "divided period" refers to each period obtained by dividing the management period into 2 to 10 periods, preferably 7 to 8 periods. Since 7 to 8 divided periods can reproduce most water level management schedules implemented in Japan, the management period is divided into 7 or 8 divided periods in the water level management schedule shown in Figure 2.

The start and end dates of each division period are not particularly limited, but are preferably determined in association with the developmental stage of rice (e.g., transplantation date, panicle formation date, heading date, maturity date). For example, in the water level management schedule shown in 2001 of FIG. 2, the start date of the division period is associated with the difference in days from each developmental stage. Specifically, the start date of the division period (1) is associated with the transplantation date +0 days, and the start date of the division period (3) is associated with the panicle formation date +0 days. Also, for example, in the water level management schedule shown in 2001 of FIG. 2, the start date of the division period (2) is associated with the transplantation date +10 days, the start date of the division period (4) is associated with the panicle formation date +20 days, the start date of the division period (5) is associated with the heading date -5 days, the start date of the division period (6) is associated with the heading date +15 days, and the start date of the division period (7) is associated with the heading date +30 days. This makes it possible to create a water level management schedule suitable for each developmental stage. The length of the installment period will be automatically determined when the start date of the next installment period is decided.

"Water management elements" represent paddy field water level management patterns (hereinafter referred to as "water level management patterns"). "Water level management patterns" include information such as the water level management method, maximum water level, repetition cycle of the water level management method, and start date of the period of the water level management method. "Water management elements" include water management elements that represent four different water level management patterns, called, for example, "constant flooding," "water fall management," "intermittent irrigation," or "deep water management." Note that the start date of the period of the water level management method indicated by a water management element corresponds to the start date of the divided period to which the water management element is assigned, and the length of the period of the water level management method indicated by a water management element corresponds to the length of the divided period to which the water management element is assigned.

The water management element "constant flooding" represents a water level management method for maintaining the water level of the target paddy field at a set maximum water level over the divided period to which the water management element is assigned. During the period to which "constant flooding" is assigned, in order to keep the water level constant, water is supplied little by little every day, for example, to make up for the drop in water level from the set paddy field level due to evapotranspiration, seepage into the ground, etc.

The water management element "constant flooding" includes, in addition to the water level management method described above, the maximum water level in the divided period to which the water management element is assigned, and information on the start date of the period of the water level management method indicated by the water management element. The maximum water level set in "constant flooding" is usually in the range of 0 to 20 cm, but is not limited to this range and can be set appropriately depending on the height of the banks of the target rice field. For example, the water level management pattern of the water management element "constant flooding" in the water level management schedule can be represented diagrammatically by patterns a1 to a3 assigned respectively to divided periods (1), (2), and (5) shown in 2001 in Figure 2.

"Constant flooding" may further include information on the lower limit water level in the divided period to which the water management element is assigned. The "lower limit water level" is the lower limit of the water level. In "constant flooding", by setting both the maximum water level and the lower limit water level, it is possible to maintain the water level constant with a specified buffer zone. The "buffer zone" is the difference between the maximum water level and the lower limit water level. This makes it possible to manage the water level so that water supply begins when the water level falls below the lower limit water level, rather than starting immediately when the water level falls even slightly below the maximum water level. As a result, the frequency of water supply can be reduced, contributing to water conservation. In addition, by widening the width of the "buffer zone" in "constant flooding", it is possible to accommodate "intermittent irrigation", which will be described later.

The water management element "water fall management" represents a water level management method in which water is not supplied and the drain is opened to forcibly continue to drain the water over the divided period to which the water management element is assigned. During the period to which the water management element "water fall management" is assigned, the drain is kept open, so the groundwater level continues to fall even after the water level reaches 0 cm. As a result, the paddy field water level may fall below 0 cm. In addition to the water level management method described above, the water management element "water fall management" includes information on the start date of the period of the water level management method. For example, the water level management pattern of the water management element "water fall management" in the water level management schedule can be represented diagrammatically by patterns b1 and b2, which are respectively assigned to divided periods (4) and (7) shown in 2001 in Figure 2.

The water management element "intermittent irrigation" refers to a water level management method that performs one or more cycles of a water supply step, in which water is supplied to the target paddy field until the water level reaches a set maximum water level, and a natural drainage step, in which no water is supplied and the drain is left closed to allow the water to drain naturally. The speed at which the water drains in the natural drainage step depends on the receding water depth of the target paddy field, and the water usually drains at a rate that causes the water level to drop by 1 to 2 cm per day.

In addition to the water level management method described above, the water management element "intermittent irrigation" includes information on the maximum water level in the divided period to which the water management element is assigned, the start date of the period of the water level management method indicated by the water management element, and the period per cycle (repetition period). The maximum water level set in "intermittent irrigation" is the maximum water level in the water supply step, which is usually in the range of 0 to 20 cm, but is not limited to this range and can be set appropriately depending on the height of the banks of the target rice field. The repetition period can be set appropriately, for example, a specific period (7 days, etc.) may be set by the user, or the next water supply step may be set to start depending on the dryness of the soil. The dryness of the soil can be grasped by using the measured values of the groundwater level and soil moisture content, or the calculated value of the water reduction depth. There are no particular limitations on the method of checking the groundwater level and soil moisture content, and for example, the groundwater level can be checked using a water level sensor 77 (Figure 1) described later. In addition, the soil moisture content can be checked using a soil moisture sensor (not shown) or by estimation using a model, etc. The method for calculating the reduced water depth will be described later. For example, the water level management pattern of "intermittent irrigation" in the water level management schedule can be represented diagrammatically by pattern c1 assigned to the divided period (6) shown in 2001 in FIG. 2.

The water management element "intermittent irrigation" can also accommodate "saturation management," a water level management method that keeps the soil moist with minimal flooding by adjusting the maximum water level and repetition cycle in the water supply step. The pattern assigned to the division period (5) shown in 2003 in Figure 2 corresponds to "saturation management."

The water management element "deep water management" represents a water level management method in which water is supplied so that the water level of the target paddy field rises at a constant rate over the divided period to which the water management element is assigned until the water level reaches a set maximum water level. For example, water is supplied so that the water level rises by 1 cm per day in line with the growth speed of the young panicles. After the water level of the target paddy field reaches the maximum water level, the drop in the water level due to evapotranspiration, seepage into the ground, etc. is compensated for by, for example, supplying a little water every day in order to maintain the maximum water level.

In addition to the above-mentioned water level management method, the water management element "deep water management" includes information on the maximum water level in the divided period to which the water management element is assigned, the amount of water level rise per day, and the start date of the period of the water level management method indicated by the water management element. The maximum water level set in the water management element "deep water management" is usually in the range of 0 to 20 cm, but is not limited to this range and can be set appropriately depending on the height of the bank of the target paddy field. In addition, the amount of water level rise per day set in the water management element "deep water management" can be set appropriately by the user. In addition, since the water level management method indicated by the water management element "deep water management" is particularly suitable for low temperature countermeasures during the young panicle formation period, it is preferable that the start date of the period of the water level management method set in the water management element "deep water management" is associated with the young panicle formation date + 0 days. For example, the water level management pattern of the water management element "deep water management" in the water level management schedule can be represented diagrammatically by the pattern d1 assigned to the divided period (3) shown in 2001 in FIG. 2.
(Control device 50)
As shown in Fig. 1, the control device 50 includes a communication unit 51, a water level management schedule receiving unit 53, and a water supply and drainage unit control unit 55. The communication unit 51 has a function of the control device 50 communicating with the generating device 30. The water level management schedule receiving unit 53 receives the water level management schedule generated by the generating device 30. The water supply and drainage unit control unit 55 refers to the water level management schedule received by the water level management schedule receiving unit 53 and controls the water supply unit 73 and drainage unit 75 of the water level management system 70 so that the water level is the water level indicated by the water level management schedule. Specifically, the water supply and drainage unit control unit 55 controls the opening and closing of the valves of the water supply unit 73 or drainage unit 75 of the water level management system 70 to control the water supply or drainage to the rice paddy.

(Water Level Management System 70)
As shown in Fig. 1, the water level management system 70 includes a communication unit 71, a water supply unit 73, a drainage unit 75, and a water level sensor 77. The communication unit 71 has a function of allowing the water level management system 70 to communicate with the control device 50. The water supply unit 73 supplies water to the target paddy field. The drainage unit 75 drains water from the target paddy field. The water level sensor 77 measures the water level of the target paddy field.

<Processing of Generation Device 30>
The flow of processing by the generating device 30 will be described with reference to Fig. 1, Fig. 3, and Fig. 4. Fig. 3 is a flowchart showing an example of processing by the generating device 30. Fig. 4 is a diagram showing an example of a water level management schedule creation screen 4001 generated by the generating device 30.

As shown in FIG. 4, the water level management schedule creation screen 4001 includes a transplant date input area 4002, a water level management schedule input area 4004, a schedule creation button 4005, a water level management schedule display area 4006, and a water supply time management schedule display area 4007.

The transplanting date input area 4002 is an area for inputting the transplanting date of rice in the target paddy field. The transplanting date input area 4002 includes a list display button 4008, so pressing the list display button 4008 can switch between displaying and hiding the candidate transplanting date list display area (not shown). Candidate transplanting dates are displayed in the candidate transplanting date list display area, and the user can input the transplanting date by selecting a date displayed in the candidate transplanting date list display area. When the transplanting date is input in the transplanting date input area 4002, the heading date is automatically calculated based on the rice growth model and the accumulated temperature.

The water level management schedule input area 4004 is an area for inputting a water level management schedule. The management period is divided into seven sub-periods, and for each sub-period, the development stage, water level management method, maximum water level, and water supply time can be set. In the example shown in Figure 4, the management period is divided into seven sub-periods, but this is not limited to this and can be adjusted as appropriate.

Each cell in the water level management schedule input area 4004 includes a list display button, so pressing the list display button can toggle between displaying and hiding the candidate list display area (not shown) for the setting items in each cell. For example, pressing the list display button 4003 included in a developmental stage cell displays developmental stage candidates (e.g., "transplantation date + 0 days") in the candidate list display area, and the user can input the developmental stage by selecting a developmental stage displayed in the candidate list display area.

The water level management schedule display area 4006 is an area in which the water level management schedule is displayed. When the user presses the schedule creation button 4005, the water level management schedule corresponding to the input in the water level management schedule input area 4004 is displayed in the water level management schedule display area 4006.

The water supply time management schedule display area 4007 is an area where the water supply time management schedule is displayed. When the user presses the schedule creation button 4005, the water supply time management schedule corresponding to the input in the water level management schedule input area 4004 is displayed in the water supply time management schedule display area 4007.

As shown in FIG. 3, first, in step S101, the creation unit 331 accepts input from the user and creates a water level management schedule based on the input (water level management schedule creation step). Specifically, the user operates the user terminal 10, inputs the necessary information in the water level management schedule input area 4004 of the water level management schedule creation screen 4001 displayed on the display unit 13, and presses the schedule creation button 4005. The creation unit 331 accepts the user's input in the water level management schedule input area 4004, and creates a water level management schedule within the management period based on this by assigning one or more water management elements to each of the multiple divided periods. The water level management schedule created by the creation unit 331 is displayed in the water level management schedule display area 4006.

Next, in step S102, the modification unit 332 of the generating device 30 modifies the management pattern of the paddy field water level of the water management element included in the water level management schedule based on the input from the user (modification step). Specifically, the user checks the water level management schedule displayed in the water level management schedule display area 4006 of the water level management schedule creation screen 4001, changes the maximum water level or development stage in the water level management schedule input area 4004 as necessary, and presses the schedule creation button 4005. The modification unit 332 accepts the user's input in the water level management schedule input area 4004, and modifies the management pattern of the paddy field water level of the water management element to be changed based on this. The water level management schedule after the modification made by the modification unit 332 is displayed in the water level management schedule display area 4006.

Next, in step S103, the correction unit 333 of the generating device 30 corrects the paddy field water level management pattern of the water management element included in the water level management schedule by referring to one or more correction unit reference information selected from the group consisting of the transplanting date of the target rice cultivated in the target paddy field, the air temperature at the location where the target paddy field is located, the precipitation at the location where the target paddy field is located, the paddy field water level of the target paddy field, the reduced water depth of the target paddy field, and growth forecast information of the target rice cultivated in the target paddy field (correction step).

The "transplanting date" is the date on which the target rice was planted in the paddy field. Note that in the case of direct seeding, the "transplanting date" can be replaced with the "sowing date." The "sowing date" refers to the date on which the seeds were sown in the paddy field.

"Temperature" may be an actual measurement, an estimated value, or a predicted value at any point in time. There are no particular limitations on the estimated or predicted temperature value, so long as it is information that allows an estimate or prediction of the temperature at a location where a rice paddy is located. For example, it can be obtained from the Mesh Agricultural Weather Data System operated by the National Agriculture and Food Research Organization.

"Precipitation" may be an actual measurement, an estimated value, or a predicted value at any point in time. There are no particular limitations on the estimated or predicted value of precipitation, so long as it is information that allows for an estimate or prediction of the amount of precipitation at a location where a rice paddy is located. For example, it can be obtained from the Mesh Agricultural Weather Data System operated by the National Agriculture and Food Research Organization.

"Rice field water level" is an actual, estimated, or predicted value at any point in time. The estimated or predicted value of rice field water level can be estimated or predicted from the water level management schedule.

The "reduced water depth" can be calculated as the sum of the evapotranspiration rate of water in the target paddy field and the amount of infiltration into the ground (groundwater infiltration rate) using the following formula 1:
Depth of water loss (mm/day) = E + ΔS…(1)
(In the formula, E represents the amount of evapotranspiration, and ΔS represents the amount of underground infiltration.)

The amount of evapotranspiration and the amount of groundwater infiltration can be determined by known methods. Since the amount of evapotranspiration varies seasonally, for example, daily evapotranspiration can be calculated from meteorological data using a micrometeorological model or a simple empirical formula.

The amount of underground infiltration can be set to a default value according to the soil type of the target paddy field, or the value obtained by subtracting the evapotranspiration rate from the reduced water depth can be used as the amount of underground infiltration. The "reduced water depth" can be set to a fixed value for each paddy field, or can be calculated automatically from observed data on the paddy water level.

"Growth prediction information" is the result of predicting the growth of the target rice plant cultivated in the target paddy field, such as the heading date. There are no particular limitations on "growth prediction information" as long as it is information that can predict the growth stage of the target rice plant.

In step S103, the correction unit 333 refers to the "growth prediction information" and makes corrections by advancing or delaying the start date of the period of the water level management method indicated by the water management element. The length of the period of the water level management method indicated by the water management element is automatically determined when the start date of the next period is determined. The length of the period of the water level management method indicated by the water management element corresponds to the length of the divided period to which the water management element is assigned. Since the start and end dates of the divided period are determined in association with the rice growth stage, the correction unit 333 can correct the discrepancy between the growth stage set in the water level management schedule and the growth prediction information by referring to the "growth prediction information". The correction unit 333 also refers to at least one of the "precipitation prediction value" or the "reduced water depth" and makes corrections by raising or lowering the maximum water level of the paddy field specified by the water management element.

<Processing of the control device 50>
The flow of processing by the control device 50 will be described with reference to Fig. 1 and Fig. 11. Fig. 11 is a flowchart showing an example of processing by the control device 50 according to the first embodiment of the present invention.

First, in step S401, the water level management schedule receiving unit 53 of the control device 50 receives the water level management schedule generated by the generation device 30 (water level management schedule receiving step).

Next, in step S402, the water supply and drainage unit control unit 55 of the control device 50 refers to the water level management schedule received by the water level management schedule receiving unit 53 and controls the water supply unit 73 and drainage unit 75 of the water level management system 70 so as to achieve the water level indicated in the water level management schedule (water supply and drainage unit control step).

The paddy field water level is constantly monitored by the water level sensor 77. If the paddy field water level exceeds the paddy field water level specified by the water level management schedule due to water supply or the effects of rain before water supply, the water supply and drainage unit control unit 55 controls the water supply unit 73 to stop water supply, and at the same time controls the drainage unit 75 to automatically drain the water.

<Effects of this embodiment>
In this embodiment, the generating device 30 creates and modifies a water level management schedule based on input from the user, allowing the user to create and modify a water level management schedule as desired.

The inventor discovered that most water level management patterns in rice cultivation can be covered by the four types of "constant flooding," "water fall management," "intermittent irrigation," or "deep water management," and that most water level management schedules implemented in Japan can be reproduced by combining these, leading to the completion of the present invention. With the generation device 30, the user can easily create a water level management schedule by simply selecting a water level management pattern in the water level management schedule from among multiple water management elements including the four types of water management elements and assigning it to a divided period. In addition, by adopting a method of creating a water level management schedule by assigning water management elements to a divided period, when a new water level management pattern becomes necessary, it is possible to create a water level management schedule including a new water level management pattern simply by adding the corresponding new water management element to the water management element options.

In addition, by expressing the water level management schedule as a combination of patterns representing each water management element (e.g., patterns a to d shown in Figure 2), it becomes easier for users to visually grasp the contents of the water level management schedule (e.g., the paddy field water level, repetition cycle, start date of the period, etc., set in each pattern). In addition, because the water level management schedule is linked to the development stage, it can also be applied to other transplanting dates and other regions with different weather conditions.

Furthermore, the created water level management schedule can be corrected according to one or more correction section reference information selected from the group consisting of the transplanting date of the target rice cultivated in the paddy field, the temperature at the location where the paddy field is located, the precipitation at the location where the paddy field is located, the paddy field water level, the paddy field water depth, and growth prediction information of the target rice cultivated in the paddy field, so that an appropriate water level management schedule can be created according to weather conditions and growth.

In addition, the control device 50 controls the water supply section 73 and the drainage section 75 of the water level management system 70 according to the water level management schedule, making it possible to implement water level management as desired by the user.

[Modifications]
The generating device 30 can also be configured such that the selection unit 334 selects one of a plurality of pre-created water level management schedules based on an input from a user, and the creation unit 331 creates a new water level management schedule by changing the water management elements indicated in the water level management schedule selected by the selection unit 334 and the allocation of the water management elements to the divided periods based on the input from the user. It is preferable that the plurality of pre-created water level management schedules include a water level management schedule showing a customary water management pattern for each region.

Figure 2 shows an example of a water level management schedule that shows conventional water management patterns for each region. The water level management schedules for 2001 to 2004 in Figure 2 are water level management schedules that show conventional water management patterns for regions A to D, respectively. As Figure 2 shows, it can be seen that there are regional differences in water level management schedules.

The multiple water level management schedules created in advance may include a schedule created in advance by the user. The multiple water level management schedules created in advance are stored in the memory unit 35.

<Processing variations>
Instead of step S101 described above, the following steps S101-1 and S101-2 are carried out. First, in step S101-1, the user inputs the name of the region in which the target paddy field is located in the water level management schedule creation screen 4001. Based on the user's input, the selection unit 334 selects a water level management schedule that shows the conventional water management pattern for the specified region from among multiple water level management schedules created in advance and stored in the storage unit 35, and displays the water level management schedule in the water level management schedule display area 4006 (selection step). Information corresponding to the selected water level management schedule is displayed in the water level management schedule input area 4004.

Next, in step S101-2, the user operates the user terminal 10 to change the water management elements assigned to each divided period from the information displayed in the water level management schedule input area 4004, and presses the schedule creation button 4005. The creation unit 331 accepts the user's input in the water level management schedule input area 4004, and creates a new water level management schedule by changing the water management elements assigned to each divided period based on this. The new water level management schedule created by the creation unit 331 is displayed in the water level management schedule display area 4006. Subsequent steps S102 and S103 are as described above.

<Effects of this modified example>
In this modified example, the selection unit 334 selects a water level management schedule corresponding to information specified by the user (e.g., region name, template name, etc.) from a plurality of pre-created water level management schedules stored in the storage unit 35, allowing the user to use the selected existing water level management schedule as a template for a newly created water level management schedule. The user can change information such as water management elements included in the template water level management schedule as desired. This makes it easier for the user to create a desired water level management schedule compared to when the user has to enter information from scratch in the water level management schedule input area 4004 of the water level management schedule creation screen 4001.

[Embodiment 2]
A second embodiment of the present invention will be described below. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the previous embodiment, and the description thereof will not be repeated.

<Configuration>
The configuration of the generating device 30a according to the second embodiment will be described with reference to Fig. 5. Fig. 5 is a functional block diagram showing the configuration of an automatic water management system 1a including the generating device 30a according to the second embodiment. As shown in Fig. 5, the generating device 30a differs from the generating device 30 according to the first embodiment at least in that the control unit 33a further includes a water demand forecast value calculation unit 335 and a water level management schedule execution determination unit 336.

<Function>
The functions of the water demand forecast value calculation unit 335 and the water level management schedule execution decision unit 336 provided in the control unit 33a of the generation device 30a will be described.

The water demand forecast calculation unit 335 refers to the water level management schedule and calculates the forecast value of the water demand for each day within the management period. The method of calculating the forecast value of the water demand for the target day within the management period will be described later.

The water level management schedule execution decision unit 336 refers to the accumulated value of the predicted precipitation and the accumulated value of the predicted water demand for n consecutive days (n is an integer greater than or equal to 1) starting from the target date within the management period, and decides whether to execute water supply and drainage according to the water level management schedule on the target date.

<Processing>
The process flow of the generating device 30a will be described with reference to Fig. 5, Fig. 6, and Fig. 7. Fig. 6 is a diagram for explaining an outline of water demand prediction in the generating device according to the second embodiment of the present invention. As shown in Fig. 6, the generating device 30a predicts the water demand for each day during the management period in the target paddy field based on information of the created water level management schedule.

Figure 7 is a flowchart showing an example of processing by the generating device 30a. The processing flow for creating a water level management schedule by the generating device 30 is the same as that described in embodiment 1, so a description thereof will be omitted.

In step S201, the water demand forecast value calculation unit 335 of the generating device 30a refers to the water level management schedule and calculates the forecast value of the water demand for each day within the management period (water demand forecast value calculation step).

The water demand (W _i ) on the calculation target day during the management period in the target paddy field can be calculated from the paddy field water level on the calculation target day, the paddy field water level on the day after the calculation target day, and the reduced water depth of the target paddy field. Specifically, it can be calculated from the following formula 2:
W _i =D _i+1 −D _i +(E _i +ΔS _i )…(2)
(In the formula, D _i represents the paddy field water level on the calculation date, D _i+1 represents the paddy field water level on the day following the calculation date, and (E _i + ΔS _i ) represents the reduced water depth on the calculation date).

The paddy field water level on the calculation day can be found by referring to the paddy field water level on the calculation day in the water level management schedule. Similarly, the paddy field water level on the day after the calculation day can be found by referring to the paddy field water level on the day after the calculation day in the water level management schedule. The method for calculating the reduced water depth of the target paddy field is as described above. Note that in Equation 2, the reduced water depth uses the value of the reduced water depth on the calculation day, but the reduced water depth may be set to a fixed value for each paddy field, or seasonal changes may be calculated by calculating the amount of evapotranspiration from meteorological data.

Next, in step S202, the water level management schedule execution decision unit 336 of the generating device 30 refers to the accumulated value of the predicted precipitation for n consecutive days (n is an integer equal to or greater than 1) starting from the target day (the target day determined by the water level management schedule execution decision unit 336) within the management period, and the accumulated value of the predicted water demand for n consecutive days (n is an integer equal to or greater than 1) starting from the target day calculated in step S201, and decides whether or not to execute water supply and drainage according to the water level management schedule on the target day (water level management schedule execution decision step). The predicted precipitation is the predicted precipitation at the point where the rice paddy is located. The value of n is not particularly limited, but is usually 1 to 10, preferably 2 to 3.

For example, the water level management schedule execution decision unit 336 can decide whether or not to execute water supply and drainage according to the water level management schedule based on an evaluation value Y calculated from the following formula 3:
The evaluation value Y is the value obtained by multiplying the accumulated value of precipitation P for n consecutive days starting from the target date by a weighting coefficient K (0 to 1) minus the accumulated value of water demand W for n consecutive days starting from the target date.

For example, when the evaluation value Y>0, i.e., when K=1, if the accumulated value of the predicted precipitation for consecutive n days starting from the target date exceeds the predicted value of the water demand , the water level management schedule execution decision unit 336 decides to stop water supply on the target date without following the water level management schedule in order to save water. This allows the paddy field water level indicated in the water level management schedule to be achieved without water supply, leading to water conservation. Also, when the evaluation value Y>100, i.e., when the difference between the accumulated value of the precipitation for consecutive n days starting from the target date and the predicted value of the water demand is 100 mm or more, it decides to perform forced drainage for disaster prevention. The threshold value of the evaluation value Y and the values of K and n in Equation 3 can be set appropriately by the user.

It is preferable to set a threshold value in advance for the number of days during which continuous operation that does not follow the water level management schedule is permitted, and if this threshold is exceeded, the water level management schedule execution decision unit 336 decides to carry out water supply and drainage according to the water level management schedule regardless of the evaluation value Y. This makes it possible to prevent the actual water management operation from deviating significantly from the water level management schedule. The threshold value for the number of days during which continuous operation that does not follow the water level management schedule is permitted can be set by the user as appropriate, but is typically 2 to 3 days.

<Effects of this embodiment>
In this embodiment, the water demand forecast value calculation unit 335 of the generating device 30a calculates the water demand for each day during the management period, and the water level management schedule can be used to grasp the daily water demand for the entire management period. In addition, by grasping the daily water demand for the entire management period, it is possible to compare and consider in advance what kind of water level management schedule can reduce the water demand. Furthermore, the water level management schedule execution decision unit 336 refers to the predicted precipitation and the predicted value of the water demand and determines whether or not to execute water supply and drainage according to the water level management schedule on the target day, so that if it is likely to rain on the day after the target day, water supply can be stopped to save water. In addition, this embodiment can be applied to disaster prevention using rice paddies, and applications such as active drainage to utilize the water storage function of rice paddies when heavy rain is expected on the day after the target day or in the near future can be expected.

[Embodiment 3]
A third embodiment of the present invention will be described below. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the previous embodiment, and the description thereof will not be repeated.

<Configuration>
The configuration of the generating device 30b according to the third embodiment will be described with reference to Fig. 8. Fig. 8 is a functional block diagram showing the configuration of an automatic water management system 1b including the generating device 30b according to the third embodiment. As shown in Fig. 8, the generating device 30b differs from the generating device 30 according to the first embodiment at least in that the control unit 33b further includes a water supply time determination unit 337.

<Function>
The water-supply time determination unit 337 included in the control unit 33b of the generation device 30b determines the optimal water-supply time by referring to the water level management schedule and the weather data on the day of water supply. Here, the "optimum water-supply time" refers to the optimal water-supply time for making the water temperature of the target paddy field the highest (or lowest). The weather data is specifically data on the daily maximum temperature and daily minimum temperature.

<Processing>
The process flow of the generating device 30b will be described with reference to Fig. 8 and Fig. 10. Fig. 10 is a flowchart showing an example of the process by the generating device 30b. The process flow of the water level management schedule creation by the generating device 30 is the same as that described in the first embodiment, and therefore the description will be omitted.

In step S301, the water supply time determination unit 337 of the generation device 30b receives weather data for the day when water supply is to be performed (data reception step).

Next, in step S302, the optimal water supply time is determined by referring to the water level management schedule and the weather data for the water supply day received in S301 (water supply time determination step). For example, by referring to information on the paddy field water level and rice growth stage for the water supply day shown in the water level management schedule, and the daily maximum and minimum temperatures as weather data, the water supply time that maximizes the "daily minimum water temperature" is determined as the optimal water supply time that maximizes the paddy field water temperature through simulation. Alternatively, by referring to information on the paddy field water level and growth stage for the water supply day shown in the water level management schedule, and the daily maximum and minimum temperatures, the water supply time that minimizes the "daily maximum water temperature" is determined as the optimal water supply time that minimizes the paddy field water temperature through simulation.

In addition, for example, by referring to information on the paddy field water level and rice development stage on the day of watering shown in the water level management schedule, and the daily maximum and minimum temperatures, a simulation may be performed to determine the watering time that will make the "daily average water temperature" the highest as the optimal watering time that will make the paddy field water temperature the highest, or the watering time that will make the "daily average water temperature" the lowest as the optimal watering time that will make the paddy field water temperature the lowest.

In the water level management schedule creation screen 4001 shown in FIG. 4, the user can specify a water supply time in the water supply time cell in the water level management schedule input area 4004. The time specified by the user is displayed as a water supply time management schedule in the water supply time management schedule display area 4007. Although not shown, for example, if the user specifies the optimal water supply time that maximizes the water temperature in the paddy field in the water supply time cell in the water level management schedule input area 4004, in S302, the water supply time determination unit 337 refers to the paddy field water level on the water supply implementation day, information on the rice growth stage, and weather data, and determines the optimal water supply time for maximizes the water temperature in the paddy field through simulation. The determined time is displayed on the water supply time management schedule.

The generating device 30b outputs the created water supply time management schedule to the control device 50. The control device 50, which receives the water supply time management schedule, controls the water supply unit 73 of the water level management system 70 to supply water at the times specified in the water supply time management schedule.

<Effects of this embodiment>
In this embodiment, the water supply time determination unit 337 of the generating device 30b determines the optimal water supply time for managing the water temperature in the paddy field, thereby enabling water management that raises (or lowers) the paddy field water temperature as much as possible as a countermeasure against low or high temperatures. In addition, since the water supply time determination unit 337 determines the optimal water supply time by referring to the water level management schedule and the weather data on the day water supply is performed, it is also possible to automatically update the optimal water supply time based on the daily weather forecast.

[Modifications]
FIG. 9 is a diagram showing an example of a lookup table showing the relationship between weather data, the rice growth stage, the paddy field water level, and the optimal water-supply time. In the lookup table shown in FIG. 9, the daily maximum temperature and the daily minimum temperature are used as weather data. "Optimal time 1" shown in FIG. 9 represents the optimal water-supply time at which the daily minimum water temperature is the highest. "Optimal time 2" represents the optimal water-supply time at which the daily maximum water temperature is the lowest. The water-supply time determination unit 337 can also determine the optimal water-supply time from the weather data on the water-supply implementation day, the rice growth stage, and the paddy field water level by referring to a lookup table showing the relationship between weather data, the rice growth stage, the paddy field water level, and the optimal water-supply time (hereinafter referred to as "optimal water-supply time determination lookup table").

The lookup table for determining the optimal water supply time can be created by performing a paddy field water temperature simulation using meteorological data (e.g., daily maximum temperature, daily minimum temperature), rice development stage, and paddy field water level. A publicly known model can be used as the paddy field water temperature simulation model (see, for example, Atsushi Maruyama et. al., "A Water Temperature Simulation Model for Rice Paddies With Variable Water Depths" Water Resources Research, Vol 53, Issue 12, December 2017, p.10065-10084). The lookup table for determining the optimal water supply time is stored in the memory unit 35.

The optimum water supply time determination lookup table according to the conditions of the target paddy field may be created by executing the paddy field water temperature simulation model while changing the reduced water depth, the water supply time, and the water supply temperature according to the conditions of the target paddy field. Alternatively, the optimum water supply time determination lookup table according to the conditions of the target paddy field may be created by executing the paddy field water temperature simulation model while changing the reduced water depth, the water supply amount, the water supply time, and the water supply temperature according to the conditions of the target paddy field. For example, the optimum water supply time determination lookup table shown in FIG. 9 was created on the assumption that the same amount of water as the reduced water depth is supplied once a day in one hour, but an optimum water supply time determination lookup table may be created that further takes into account the differences in the conditions of the reduced water depth, the water supply amount, the water supply time, and the water supply temperature. By using the latter optimum water supply time determination lookup table, it is possible to determine the optimum water supply time corresponding to "run-on irrigation" in which an amount of water greater than the reduced water depth is supplied over a long period of time. Additionally, the optimal water supply time shown in the lookup table for determining the optimal water supply time may be the time at which the daily average water temperature is highest (or lowest).

<Processing variations>
Instead of steps S301 and S302 described above, the following steps S301-1 and S302-1 are performed. First, in step S301-1, the water-supply time determination unit 337 of the generation device 30b receives meteorological data for the location of the target paddy field on the water-supply day (data receiving step). The meteorological data uses the daily maximum temperature and daily minimum temperature for the location of the target paddy field on the water-supply day.

Next, in step S302-1, the optimal watering time is determined by referring to the weather data received in S301-1, the information on the paddy field water level and rice growth stage on the watering implementation date shown in the water level management schedule, and a lookup table for determining optimal watering times (watering time determination step). In the lookup table for determining optimal watering times, the weather data, rice growth stage, and paddy field water level values are shown in stages, and the closest value is selected (for example, if the water level is 51 mm, the closest value of 60 mm is selected).

<Effects of this modified example>
In this modified example, the water supply time determination unit 337 determines the optimal water supply time by referring to a lookup table for determining the optimal water supply time, thereby improving the processing speed of the water supply time determination unit 337 compared to when the lookup table is not used.

[Software implementation example]
The control blocks of the generation devices 30, 30a, and 30b (particularly the control units 33, 33a, and 33b) and the control device 50 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or by software.

In the latter case, the generating devices 30, 30a, and 30b and the control device 50 are equipped with a computer that executes the instructions of a program, which is software that realizes each function. This computer is equipped with, for example, one or more processors, and a computer-readable recording medium that stores the program. The object of the present invention is achieved by the processor reading the program from the recording medium and executing it in the computer. The processor can be, for example, a CPU (Central Processing Unit). The recording medium can be a "non-transient tangible medium", such as a ROM (Read Only Memory), as well as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, etc. The computer may also be equipped with a RAM (Random Access Memory) that expands the program. The program may be supplied to the computer via any transmission medium (such as a communication network or a broadcast wave) that can transmit the program. Note that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

〔summary〕
A generating device according to aspect 1 of the present invention is a generating device that generates a water level management schedule for controlling water supply and drainage to a rice paddy and managing the water level of the rice paddy, and is configured to receive a water level management schedule created by assigning one or more water management elements selected from a plurality of water management elements having different rice paddy water level management patterns to each of a plurality of divided periods into which a management period for managing the water level of the rice paddy is divided, and to include a modification unit that modifies the rice paddy water level management pattern of the water management elements included in the water level management schedule based on input from a user.

The generating device according to aspect 2 of the present invention may be configured as in aspect 1, further including a correction unit that corrects the paddy field water level management pattern of the water management element included in the water level management schedule by referring to one or more selected from the group consisting of the transplanting date of the target rice plant to be cultivated in the paddy field, the air temperature at the location where the paddy field is located, the precipitation at the location where the paddy field is located, the paddy field water level of the paddy field, the reduced water depth of the paddy field, and growth forecast information of the target rice plant to be cultivated in the paddy field.

The generating device according to aspect 3 of the present invention may be configured in the above-mentioned aspect 1 or 2 to further include a creation unit that assigns one or more water management elements selected from a plurality of water management elements having different paddy field water level management patterns to each of a plurality of divided periods into which a management period for managing the paddy field water level is divided, based on input from a user, and creates a water level management schedule within the management period.

In other words, the generating device according to aspect 3 of the present invention is a generating device that generates a water level management schedule for controlling the water supply and drainage to a paddy field to manage the water level of the paddy field, and may include a generating unit that assigns one or more water management elements selected from a plurality of water management elements having different paddy water level management patterns to each of a plurality of divided periods into which a management period for managing the water level of the paddy field is divided based on input from a user, and creates a water level management schedule within the management period; a changing unit that changes the paddy water level management pattern of the water management element included in the water level management schedule based on input from a user; and a correcting unit that corrects the paddy water level management pattern of the water management element included in the water level management schedule by referring to one or more selected from the group consisting of the transplanting date of the target rice to be cultivated in the paddy field, the air temperature at the location where the paddy field is located, the precipitation at the location where the paddy field is located, the paddy water level of the paddy field, the water reduction depth of the paddy field, and growth forecast information of the target rice to be cultivated in the paddy field.

The generating device according to aspect 4 of the present invention, in any one of aspects 1 to 3, may further include a water demand forecast value calculation unit that calculates a forecast value of water demand for each day within the management period by referring to the water level management schedule, and the water demand forecast value calculation unit may be configured to calculate a forecast value of water demand for the calculation target day from the paddy field water level on the calculation target day within the management period in the target paddy field, the paddy field water level on the day following the calculation target day, and the reduced water depth of the target paddy field by referring to the water level management schedule.

The generating device of aspect 5 of the present invention may be configured in accordance with aspect 4 as described above to further include a water level management schedule execution decision unit which refers to the accumulated value of the predicted precipitation and the accumulated value of the predicted water demand for n consecutive days (n is an integer greater than or equal to 1) starting from a target day within the management period, and determines whether or not to carry out water supply and drainage according to the water level management schedule on the target day.

The generating device according to aspect 6 of the present invention may be configured in any one of aspects 1 to 5 above, further including a water supply time determination unit that determines the optimal water supply time by referring to the water level management schedule and meteorological data for the location of the target paddy field on the water supply implementation day.

In the generating device according to aspect 7 of the present invention, in the above aspect 6, the water supply time determination unit may be configured to determine the optimal water supply time from the weather data for the location where the target rice field is located on the water supply implementation day and the water level management schedule by referring to a lookup table showing the relationship between weather data, the rice development stage, and the paddy field water level and the optimal water supply time.

The generation method according to aspect 8 of the present invention is a method for generating a water level management schedule for controlling the water supply and drainage to a rice paddy and managing the water level of the rice paddy, and includes a step of receiving a water level management schedule created by assigning one or more water management elements selected from a plurality of water management elements with different rice paddy water level management patterns to each of a plurality of divided periods into which a management period for managing the water level of the rice paddy is divided, and changing the rice paddy water level management pattern of the water management elements included in the water level management schedule based on input from a user.

The generation method according to aspect 8 of the present invention is a generation method for generating a water level management schedule for controlling water supply and drainage to a paddy field to manage the water level of the paddy field, and may include the steps of: assigning one or more water management elements selected from a plurality of water management elements having different paddy water level management patterns to each of a plurality of divided periods into which a management period for managing the water level of the paddy field is divided based on an input from a user, and creating a water level management schedule for the management period; changing the paddy water level management pattern of the water management element included in the water level management schedule based on an input from a user; and correcting the paddy water level management pattern of the water management element included in the water level management schedule by referring to one or more selected from the group consisting of the transplanting date of the target rice to be cultivated in the paddy field, the air temperature at the location where the paddy field is located, the precipitation at the location where the paddy field is located, the paddy water level of the paddy field, the water depth of the paddy field, and growth forecast information of the target rice to be cultivated in the paddy field.

The control device according to aspect 10 of the present invention is a control device for controlling a water level management system having a water supply unit that supplies water to a target paddy field and a drainage unit that drains water from the target paddy field, and may be configured to include a water level management schedule receiving unit that receives a water level management schedule generated by a generating device according to any one of aspects 1 to 7, and a water supply and drainage unit control unit that controls the water supply unit and the drainage unit by referring to the water level management schedule received by the water level management schedule receiving unit.

The control method according to aspect 11 of the present invention is a method for controlling a water level management system having a water supply unit that supplies water to a target paddy field and a drainage unit that drains water from the target paddy field, and may include a water level management schedule receiving step for receiving a water level management schedule generated by a generating device of any of aspects 1 to 7, and a water supply/drainage amount adjustment step for adjusting the amount of water supplied from the water supply unit and the amount of water drained from the drainage unit by referring to the water level management schedule received in the water level management schedule receiving step.

The generating device and the control device according to each aspect of the present invention may be realized by a computer. In this case, the control programs of the generating device and the control device that cause the computer to operate as each part (software element) of the generating device and the control device, and the computer-readable recording medium on which the control programs are recorded, also fall within the scope of the present invention.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in different embodiments.

30, 30a, 30b Generation device 50 Control device 53 Water level management schedule reception unit 55 Water supply and drainage unit control unit 70 Water level management system 73 Water supply unit 75 Drainage unit 331 Creation unit 332 Change unit 333 Correction unit 334 Selection unit 335 Water demand forecast value calculation unit 336 Water level management schedule execution decision unit 337 Water supply time decision unit

Claims (10)

A generating device for generating a water level management schedule for controlling water supply and drainage to a rice paddy to manage the water level of the rice paddy,
a change unit that receives a water level management schedule created by assigning one or more water management elements selected from a plurality of water management elements having different paddy field water level management patterns to each of a plurality of divided periods into which a management period for managing the paddy field water level is divided, and changes the paddy field water level management pattern of the water management element included in the water level management schedule based on an input from a user;
A water supply time determination unit that determines an optimal water supply time by referring to the water level management schedule and meteorological data for a location where a target paddy field is located on the water supply implementation day;
Including,
The weather data is a daily maximum temperature and a daily minimum temperature,
The generating device , wherein the water management elements are constant flooding, fallow management, intermittent irrigation, and deep water management . The generating device according to claim 1, further comprising a correction unit that corrects the paddy water level management pattern of the water management element included in the water level management schedule by referring to one or more selected from the group consisting of the transplanting date of the target rice plant to be cultivated in the paddy field, the temperature at the location where the paddy field is located, the precipitation at the location where the paddy field is located, the paddy water level of the paddy field, the paddy water depth, and growth forecast information of the target rice plant to be cultivated in the paddy field. The generating device according to claim 1 or 2, further comprising a creation unit that assigns one or more water management elements selected from a plurality of water management elements having different paddy field water level management patterns based on a user input to each of a plurality of divided periods into which a management period for managing the paddy field water level is divided, and creates a water level management schedule within the management period. A water demand forecast value calculation unit calculates a forecast value of water demand for each day within the management period by referring to the water level management schedule,
A generating device as described in any one of claims 1 to 3, characterized in that the water demand forecast value calculation unit calculates a forecast value of the water demand for the calculation target day from the paddy field water level on the calculation target day within the management period in the target paddy field, the paddy field water level on the day after the calculation target day, and the reduced water depth of the target paddy field, by referring to the water level management schedule. The generating device according to claim 4, further comprising a water level management schedule execution decision unit that refers to the integrated value of the predicted precipitation and the integrated value of the predicted water demand for consecutive n days (n is an integer equal to or greater than 1) starting from a target date within the management period and decides whether or not to execute water supply and drainage according to the water level management schedule on the target date. The generation device described in claim 1, characterized in that the water supply time determination unit determines the optimal water supply time from the weather data for the location where the target rice field is located on the water supply implementation day and the water level management schedule by referring to a lookup table showing the relationship between meteorological data, rice growth stage, and rice field water level and the optimal water supply time. A generation program for causing a computer to function as the generation device according to claim 1, the generation program causing the computer to function as the change unit. A control device for controlling a water level management system including a water supply unit that supplies water to a target paddy field and a drainage unit that drains water from the target paddy field,
a water level management schedule receiving unit that receives a water level management schedule generated by the generating device according to any one of claims 1 to 6 ;
a water supply and drainage unit control unit that controls the water supply unit and the drainage unit by referring to the water level management schedule received by the water level management schedule receiving unit;
A control device comprising: A method for controlling a water level control system having a water supply unit that supplies water to a target paddy field and a drainage unit that drains water from the target paddy field,
a water level management schedule receiving step of receiving a water level management schedule generated by the generating device according to any one of claims 1 to 6 ;
a water supply/drainage amount adjustment step of adjusting the amount of water supplied from the water supply unit and the amount of water drained from the drainage unit by referring to the water level management schedule received in the water level management schedule receiving step;
A control method comprising: A control program for causing a computer to function as the control device according to claim 8 , the control program causing a computer to function as the water level management schedule receiving unit and the water supply and drainage unit control unit.

Images