JP7209652B2 - River management device, river management support system, river management support method, and river management support program - Google Patents

Description

The present disclosure relates to a river management device, a river management support system, a river management support method, and a river management support program for displaying an image of a river to be monitored and supporting river management.

Rivers are managed by river administrators such as ministries, agencies and local governments to prevent disasters such as floods and storm surges and to maintain public safety. As a means of supporting river management by river administrators, rivers measure water levels at multiple points on rivers to be monitored using water level gauges, aggregate the information in a monitoring center, and display the measurement results in real time on a display device in the monitoring center. A management support system is known (see Patent Literature 1, for example).

In this river management support system, the measured water level of the river is compared with the dangerous water level information to determine whether the water level is dangerous or not. be done.

JP-A-2003-156331

In conventional river management support systems, it is possible to automatically judge the danger of the current water level by comparing the current water level with the water level that serves as a reference for management. It was difficult to predict and grasp in advance what the actual situation around the river would be like, such as the degree of water rise and the condition of the river width, when the water level reached it.

The present disclosure has been made to solve the above-described problems, and includes a river management device, a river management support system, a river management support method, and a river that can easily grasp the situation of a river when the standard water level is reached. Intended to provide administrative support programs.

A river management device according to the present disclosure includes a processing unit that generates a reference water level composite image by superimposing a reference water level line indicating a reference water level on a river image acquired by an image acquisition device capable of changing the imaging range, and a processing unit. and an output unit for outputting the reference water level composite image generated by , and the position of the reference water level line is changed in accordance with the change of the photographing range of the image acquisition device .

A river management support system according to the present disclosure includes an image acquisition device that acquires a river image and is capable of changing the imaging range; A river management device having a processing unit that generates a water level composite image and an output unit that outputs the reference water level composite image generated by the processing unit, and a display device that displays the reference water level composite image output from the river management device. , the position of the reference water line is changed as the imaging range of the image acquisition device is changed .

A river management support method according to the present disclosure includes steps of acquiring a river image with an image acquisition device capable of changing the imaging range, and creating a standard water level composite image in which a standard water level line indicating the standard water level is superimposed on the acquired river image. It comprises a step of generating, a step of displaying the generated reference water level composite image, and a step of changing the position of the reference water level line as the imaging range of the image acquisition device is changed .

A river management support program according to the present disclosure includes a step of generating a reference water level composite image in which a reference water level line indicating the reference water level is superimposed on a river image acquired by an image acquisition device capable of changing the imaging range , in a computer. a step of outputting the generated reference water level composite image; and a step of changing the position of the reference water level line in accordance with the change of the photographing range of the image acquisition device .

According to the present disclosure, since the reference water level line is superimposed on the river image showing the current state of the river to be monitored, it is possible to easily grasp the river situation when the water level of the river reaches the reference water level in the future. becomes possible.

1 is a schematic diagram of a river management support system according to Embodiment 1; FIG. 1 is a schematic diagram of a master station system according to Embodiment 1; FIG. 4 is a diagram showing the data structure of a reference water level table held by the river management device according to Embodiment 1; FIG. 4 is a diagram showing a reference water level image held by the river management device according to Embodiment 1; FIG. 7 is a flowchart of information acquisition processing performed by the slave station management device according to Embodiment 1; 4 is a flow chart of processing for generating a reference water level composite image performed by the river management device according to Embodiment 1. FIG. 4 is a schematic diagram of a main screen displayed by the display device according to Embodiment 1. FIG. 4 is a schematic diagram of a detailed screen displayed by the display device according to Embodiment 1. FIG. FIG. 10 is a schematic diagram of a river management support system according to Embodiment 2; FIG. 10 is a diagram showing the structure and imaging range of an image acquisition device according to Embodiment 2; 10 is a flowchart of information acquisition processing performed by the slave station management device according to Embodiment 2. FIG. 10 is a flow chart of a reference water level composite image generation process performed by the river management device according to Embodiment 2. FIG. FIG. 10 is a diagram showing changes in the reference water level composite image before and after changing the imaging range in Embodiment 2; 13 is a flow chart of a reference water level composite image generation process performed by the river management device according to Embodiment 3. FIG. FIG. 11 is a diagram showing a reference water level composite image displayed by a display device according to Embodiment 3;

Embodiment 1.
<Configuration of river management support system 100>
A configuration of the river management support system 100 according to Embodiment 1 will be described with reference to FIG. FIG. 1 shows a schematic diagram of a river management support system 100. As shown in FIG. A river management support system 100 includes a sub-station system 1 installed at a river observatory located near a river, and a master station system 2 installed at a river administration office where information on each river is collectively managed by a river administrator. and

The sub-station system 1 is provided for each river observation station set at a plurality of observation sites such as bridges, embankments, dams, water gates, drainage pump stations, and retarding basins in wide-area rivers. Each slave station system 1 includes a water gauge 10 , an image acquisition device 11 , and a slave station management device 12 . The slave station system 1 may be installed in each of a plurality of river observation stations installed along the same river, or may be installed in each of multiple observation stations installed in different rivers under the jurisdiction of a river administrator. may

The water level gauge 10 is a device for measuring the water level of the river to be monitored at each observation site, and can automatically transmit measurement data to the slave station management device 12 . As the water level gauge 10, for example, a float type water level gauge, a bubble type water level gauge, a reed switch type water level gauge, a water pressure type water level gauge, an ultrasonic water level gauge, or the like can be used.

The image acquisition device 11 is a device that acquires an image of a river to be monitored at an observation site, and can automatically transmit the acquired image to the slave station management device 12 . As the image acquisition device 11, for example, a fixed CCTV (Closed-Circuit Television) camera can be used. The image acquired by the image acquisition device 11 may be either a still image or a moving image. Examples of still images include formats such as JPEG, PNG, and GIF, and examples of moving images include formats such as AVI, MOV, MPEG-2, MPEG-4, and Motion-JPEG.

The child station management device 12 is communicably connected to the water level gauge 10 and the image acquisition device 11 by a wired or wireless method. The slave station management device 12 manages river water level information and image data acquired by the water level gauge 10 and the image acquisition device 11 at the river observatory.

The master station system 2 includes a river management device 20, a display device 26, and an input device 27, and is installed in a facility of a river manager who performs river flood control, water utilization, environmental improvement planning, construction, maintenance, and the like. ing. Here, the river administrator is, for example, the Minister of Land, Infrastructure, Transport and Tourism or a prefectural governor for first-class and second-class rivers, and the mayor of a municipality for mutatis mutandis applied rivers and ordinary rivers.

The river management device 20 of the master station system 2 is communicably connected to the slave station management device 12 of the slave station system 1 via a network 3 such as a dedicated IP network, optical fiber, wireless LAN, or VPN line. . As a result, the master station system 2 can acquire the river water level information and image data acquired by each slave station system 1 at each river observation station, and can collectively manage the information necessary for monitoring. The river management device 20 is also connected to a display device 26. The display device 26 displays water level information and image data obtained from each river observation station. By checking the display device 26, the person in charge of river monitoring at the river management office can collectively monitor the conditions of each river.

The river management device 20 of the parent station system 2 is communicably connected to a system of a host institution via a network 4 such as a WAN. Higher organizations include, for example, prefectures and the Ministry of Land, Infrastructure, Transport and Tourism in the case of municipalities, and the Ministry of Land, Infrastructure, Transport and Tourism in the case of prefectures. By sharing aggregated river information among organizations such as the national government and local governments, appropriate evacuation measures can be taken when disasters such as heavy rain occur.

Furthermore, the river management device 20 of the master station system 2 is communicably connected to personal computers, mobile phones, tablet devices, etc. owned by general residents via a network 5 such as the Internet. As a result, residents in the neighborhood of the monitored river can check the water level information and image data of the river held by the river management device 20 of the master station system 2 in real time, and the residents themselves can make appropriate evacuation decisions. can.

The configuration of the master station system 2 will be explained in more detail using FIG. FIG. 2 shows a schematic diagram of the master station system 2. As shown in FIG. The master station system 2 includes a river management device 20 , a display device 26 and an input device 27 .

The river management device 20 is a computer that supports the monitoring work of the river administrator in the river management office, and includes a communication unit 21, a processing unit 22, a storage unit 23, an input unit 24, and an output unit 25. ing.

The communication unit 21 is an interface for communicating with the slave station management device 12 of the river observatory via the network 3, and is, for example, a LAN terminal. The communication unit 21 is not limited to a LAN terminal, which is a wired network terminal, and may perform wireless communication by, for example, a wireless LAN system. Further, the communication unit 21 is configured to be able to communicate with the system of the host institution and devices owned by general residents via the network 4 and the network 5 .

The processing unit 22 is a processor such as a CPU, and is connected to the communication unit 21 , storage unit 23 , input unit 24 and output unit 25 . The processing unit 22 executes a river management support program installed in the storage unit 23, and performs operation control of the communication unit 21, the storage unit 23, the input unit 24 and the output unit 25, arithmetic processing, and the like.

The storage unit 23 is a storage medium that stores the river management support program and various data executed by the processing unit 22. Examples thereof include a hard disk drive (HDD), a solid state drive (SSD), a USB flash memory, and an SD card. be done.

FIG. 3 shows the data structure of the reference water level table 6 held by the river management device 20. As shown in FIG. As shown in FIG. 3, the river management device 20 associates the values of the flood prevention team standby water level, flood warning water level, evacuation determination water level, and flood danger water level with each river observatory as information on the reference water level of each river to be monitored. are stored in the storage unit 23.

The reference water level is, for example, the water level that serves as the standard for the announcement of flood forecasts for designated rivers issued by the Ministry of Land, Infrastructure, Transport and Tourism, etc., so as to serve as a reference for judgments regarding flood control activities against flooding and flooding of rivers, etc., and evacuation behavior for residents. The standby water level of the flood control team is the water level that serves as a guideline for the flood control team to start preparations for flood control activities, and the flood warning water level is the danger of disasters such as law collapse, scouring, and water leakage, and the flood control team will be dispatched. It is the water level that serves as a warning for rivers. In addition, the water level for judgment of evacuation is a guideline for the mayor of a municipality to issue an evacuation advisory, etc., and is a water level that serves as a reference for the judgment of residents to evacuate. is the water level at which there is a risk of

Returning to FIG. 2, the storage unit 23 of the river management device 20 stores three-dimensional landform data around the river to be monitored. The 3D terrain data may be data measured by a 3D movement measuring device such as the Mobile Mapping System (MMS), or provided by public institutions such as the Geospatial Information Authority of Japan or companies that create map databases. may be used.

Furthermore, the storage unit 23 of the river management device 20 stores a reference water level image 7 to be superimposed on the river image captured by the image acquisition device 11 of the slave station system 1 . FIG. 4 shows a reference water level image 7 held by the river management device 20. As shown in FIG. As shown in FIG. 4, the storage unit 23 stores, as the reference water level image 7, a water level image 71 waiting for a flood prevention team, a water level image 72 warning about flooding, an image 73 of water level for evacuation judgment, and an image 74 of flood danger water level for each river observation station. .

In this embodiment, since a fixed CCTV camera is used as the image acquisition device 11, the imaging range monitored by the image acquisition device 11 is fixed. Therefore, the reference water level to be superimposed on the river image acquired by the image acquisition device 11 is also fixed, and the reference water level image can be created in advance. Specifically, the reference water level image 7 specifies the shooting range of the river image acquired by the image acquisition device 11 from information such as the position, posture, angle, angle of view, etc. of the image acquisition device 11 installed at the river observatory. , the reference water level line corresponding to the specified photographing range is created in advance by drawing based on the three-dimensional landform data held by the storage unit 23 .

Here, the three-dimensional topographical data held by the storage unit 23 may include not only topographical data but also three-dimensional data of structures such as bridges, concrete revetments, masonry revetments, buildings, etc., and plants such as trees. preferable. When drawing the reference water level image 7, the water level lines are drawn in consideration of the structures and heights of the buildings and plants, and the invisible water level lines hidden by the structures and plants are deleted, so that the reference water level is close to the actual one. The image 7 can be generated, and the situation around the river when the water level reaches the reference level can be more accurately grasped.

Next, the input unit 24 is an input interface for inputting operator's instructions and data from outside the river management apparatus 20, and is, for example, a USB terminal. The input unit 24 is connected to the input device 27 via a USB cable, and the processing unit 22 receives instructions from the operator from the input device 27 . Here, the input device 27 may be any device as long as it receives input from the operator, and examples thereof include a keyboard, mouse, touch panel, remote camera controller, and the like.

The output unit 25 is an output interface for outputting the data acquired by the processing unit 22, the calculation result, etc. to the outside of the river management device 20. For example, the output unit 25 is an HDMI terminal (HDMI is a registered trademark), a DVI terminal, a D- Sub terminal etc. are mentioned. The output unit 25 is connected to the display device 26 by various cables, and the processing unit 22 displays various information on the display device 26 via the output unit 25 .

The display device 26 is a device for receiving and displaying information transmitted by the river management device 20, and examples thereof include liquid crystal displays, plasma displays, organic EL displays, smart phones, mobile tablet devices, and the like. In addition, since river monitoring is performed by a plurality of river monitoring personnel in the river management office, the display device 26 may be a large multi-screen system combining a plurality of displays to improve visibility.

<Information Acquisition Processing in Slave Station System 1>
The acquisition process of river water level information and image data in the slave station system 1 installed at the river observatory will be described with reference to FIG.

FIG. 5 shows a flowchart of information acquisition processing performed by the child station management device 12 of the child station system 1 . The child station management device 12 acquires the river image captured by the image acquisition device 11 in step S101. Subsequently, the child station management device 12 acquires the water level information of the river measured by the water level gauge 10 in step S102. In step S103, the slave station management device 12 transmits the river image captured by the image acquisition device 11 and the water level information of the river measured by the water level gauge 10 to the river management device 20 of the master station system 2 via the network 3. . In this embodiment, the slave station management device 12 simultaneously transmits the acquired river image and water level information to the river management device 20 of the master station system 2. You may send.

<Generation processing of reference water level composite image in master station system 2>
Next, a process of generating a reference water level composite image in the master station system 2 will be described with reference to FIG.

FIG. 6 shows a flow chart of the reference water level composite image generation processing performed by the river management device 20 of the master station system 2 . The river management device 20 receives the river image and water level information transmitted from the slave station management device 12 in step S201. Subsequently, in step S202, the river management device 20, based on the received water level information and the reference water level of the reference water level table 6 stored in the storage unit 23 of the master station system 2, draws images to be combined with the river image. Determine the target standard water level.

Specifically, the drawing target standard water level is the water level measured by the water level gauge 10 among the flood prevention team standby water level, flood warning water level, evacuation determination water level, and flood danger water level associated with the standard water level table 6 of the river corresponding to the river image. The drawing target is the reference water level higher than the current water level. That is, the river management device 20 superimposes the reference water level line indicating the reference water level higher than the current water level of the river on the river image, and does not superimpose the reference water level line indicating the reference water level lower than the current water level of the river on the river image. .

For example, referring to the reference water level table 6 in FIG. 3, if the current water level at the XX bridge of the A river is 1.90 m, the evacuation judgment water level of 2.00 m and the flood danger water level of 2.80 m are combined with the river image. 1.30m standby water level and 1.80m overflow warning water level are not drawn. As a result, the reference water level, which is lower than the current water level and is unnecessary for monitoring, is no longer combined with the river image, making it easier to grasp the situation around the river when the water level rises.

In the present embodiment, the drawing target standard water level is determined based on the current water level measured by the water level gauge 10, but this is not limiting. All the reference water levels may be drawn and combined with the river image. In this case, there is no need to determine the object to be drawn based on the current water level of the river, and rapid image display on the display device 26 is possible.

Next, in step S203, the river management device 20 superimposes the reference water level line determined to be drawn on the river image received from the child station management device 12 to generate a reference water level composite image. For example, when the evacuation judgment water level and the flood danger water level are the reference water levels to be drawn, the river management device 20 reads the evacuation judgment water level image 73 and the flood danger water level image 74 shown in FIG. 12 to generate a reference water level composite image.

Subsequently, in step S204, the river management device 20 outputs the generated reference water level composite image to the display device 26, and the reference water level composite image is displayed on the display device 26. FIG. The output destination of the generated reference water level composite image is not limited to the display device 26, and may be output to the display device 26 of the system of the host institution shown in FIG. 1 and the equipment owned by general residents.

<Display screen in master station system 2>
Display screens displayed on the display device 26 of the master station system 2 will be described with reference to FIGS. 7 and 8. FIG.

FIG. 7 shows a schematic diagram of the main screen 8 displayed by the display device 26 of the master station system 2. As shown in FIG. The main screen 8 includes a river observatory display area 81 that indicates each river observatory managed by the river management support system 100, and a river image display area 82 that displays river images acquired by the image acquisition device 11 of the child station management device 12. and a water level graph display area 83 for displaying a graph of the water level acquired by the water level gauge 10 of the slave station management device 12 .

In the river observation station display area 81, the name of each river observation station managed by the river management support system 100 is displayed on a simplified map. Further, under each river observatory name, the current water level information received from the slave station management device 12 of each river observatory is displayed. By checking this water level information, the person in charge of river monitoring at the river management office can roughly grasp the general condition of the river under their jurisdiction.

The river image of the river observatory selected in the river observatory display area 81 is displayed in the river image display area 82 . In FIG. 7, the XX bridge is selected, and a real-time image of the river captured by the image acquisition device 11 installed at the observation station of the XX bridge is displayed. By checking this real-time image, the person in charge of river monitoring at the river management office can see the current situation of the distant river.

The water level graph display area 83 displays the water level information of the river observation station selected in the river observation station display area 81 . In FIG. 7, the ○○ bridge is selected, and the water level of the river measured by the water level gauge 10 installed at the observation station of the ○○ bridge is displayed in a graph. In addition to the current water level, this water level graph also shows the values of the water level for the flood defense team, the water level for warning of flooding, the water level for judging evacuation, and the water level for flooding danger. By checking this water level graph, the person in charge of river monitoring at the river management office can roughly grasp how much water will rise from now on until it reaches the standard water level.

FIG. 8 shows a schematic diagram of the detailed screen 9 displayed by the display device 26 of the master station system 2. As shown in FIG. A transition from the main screen 8 to the detailed screen 9 is made by pressing the river image display area 82 on the main screen 8 by operating the input device 27 . The detailed screen 9 includes a reference water level composite image display area 91 for displaying the reference water level composite image, a reference water level line display switching button 92 for switching whether or not to display the reference water level line, and a return button 93 for transitioning to the main screen 8. It has

A reference water level composite image display area 91 displays a reference water level composite image in which the reference water level image 7 is superimposed on the river image received from the slave station management device 12 . The reference water level composite image superimposes each reference water level on the real-time image of the river. It is possible to visually recognize to which area on the river image the water of the river reaches when . Therefore, even an inexperienced person in charge of river monitoring can easily grasp the condition of the river when the water level reaches the standard water level.

Here, in the reference water level composite image display area 91, each reference water level is preferably displayed in a different color. The color of each standard water level line is not particularly limited. You can grasp the degree intuitively. Further, in the present embodiment, the reference water level composite image is displayed in the reference water level composite image display area 91 of the detailed screen 9, but the present invention is not limited to this. A reference water level composite image showing the reference water level line may be displayed.

The reference water level line display switching button 92 is a button for accepting an input for switching whether or not to display the reference water level line in the river image displayed in the reference water level combined image display area 91 . The person in charge of river monitoring at the river management office presses the standard water level line display switching button 92 by operating the input device 27 to arbitrarily erase or display the standard water level line from the river image in the standard water level composite image display area 91 . can be switched to As a result, it is possible to easily confirm the portion hidden by the reference water level line, and it is possible to further improve the usability.

According to the configuration of this embodiment, a reference water level composite image obtained by superimposing a reference water level line indicating the reference water level on a river image obtained from an image acquisition device 11 installed at a river observatory or the like is installed at a river management office or the like. can be displayed on the displayed display device 26. As a result, by checking the display device 26, the person in charge of river monitoring at the river management office can easily grasp the state of the river when it reaches the standard water level due to an increase in water level, etc. becomes.

Embodiment 2.
<Configuration of river management support system 100>
The configuration of the river management support system 100 according to Embodiment 2 will be described using FIG. FIG. 9 shows a schematic diagram of the river management support system 100. As shown in FIG. In FIG. 9, the configurations with the same reference numerals as those in FIG. 1 indicate configurations that are the same as or correspond to those of the first embodiment. Here, while the image acquisition device 11 in the slave station system 1 of Embodiment 1 is a fixed CCTV camera, in the slave station system 1 of Embodiment 2, the image acquisition device 11 is a movable type I am using a camera. The configuration of the image acquisition device 11, the information acquisition processing performed by the slave station management device 12, and the reference water level composite image generation processing performed by the river management device 20 are the same as those in the first embodiment.

Examples of movable cameras include a PTZ (Pan-Tilt-Zoom) camera that can change the direction of the lens and zoom ratio by remote control, an on-vehicle camera installed on the roof of a car, and a camera installed at the bottom of a drone. A camera for aerial photography and the like can be mentioned. When a river image is acquired while moving by an on-vehicle camera or an aerial camera, the river image acquired by the image acquisition device 11 is transferred to the river of the master station system 2 without going through the slave station management device 12 of the slave station system 1 . The information may be directly transmitted to the management device 20 and the information acquisition processing may be performed by the river management device 20 .

The structure and operation of the image acquisition device 11 according to the second embodiment will be described with reference to FIG. 10, taking a PTZ camera as an example. FIG. 10 is a diagram showing the structure and imaging range of the image acquisition device 11. As shown in FIG. The image acquisition device 11 performs control (Pan) to move the angle of view in the horizontal direction by swinging the lens in the horizontal direction, and control to move the angle of view in the vertical direction by swinging the lens in the vertical direction. (Tilt) and control (Zoom) for enlarging and reducing the angle of view are possible. As a result, the image acquisition device 11 can arbitrarily change the photographing direction and change the photographing range.
<Information Acquisition Processing in Slave Station System 1>
The acquisition process of river water level information and image data in the slave station system 1 installed at the river observatory will be described with reference to FIG. 11 .

FIG. 11 shows a flowchart of information acquisition processing performed by the slave station management device 12 of the slave station system 1 . The slave station management device 12 acquires the river image captured by the image acquisition device 11 in step S301. Further, slave station management device 12 acquires information indicating the state of image acquisition device 11 from image acquisition device 11 in step S302.

The information indicating the state of the image acquisition device 11 includes, for example, the position (latitude/longitude), posture (pitch angle/roll angle/yaw angle), angle (pan angle/tilt angle), angle of view, etc. of the image acquisition device 11. information. The information indicating the state of the image acquisition device 11 may be at least one of these pieces of information. Since it can be measured and used as a fixed value, it is not necessary to transmit the position information and orientation information of the image acquisition device 11 .

Subsequently, the child station management device 12 acquires the water level information of the river measured by the water level gauge 10 in step S303. In step S304, the slave station management device 12 transmits the river image captured by the image acquisition device 11, the information indicating the state of the image acquisition device 11, and the river water level information measured by the water level gauge 10 to the master station via the network 3. It is transmitted to the river management device 20 of the system 2 . In this embodiment, the slave station management device 12 simultaneously transmits the acquired river image, information indicating the state of the image acquisition device 11, and water level information to the river management device 20 of the master station system 2. Alternatively, the river image, the information indicating the state of the image acquisition device 11, and the water level information may be transmitted separately.

<Generation processing of reference water level composite image in master station system 2>
Next, the reference water level composite image generation processing in the master station system 2 will be described with reference to FIG. 12 .

FIG. 12 shows a flow chart of the reference water level composite image generation processing performed by the river management device 20 of the master station system 2 . The river management device 20 receives the river image, the information indicating the state of the image acquisition device 11, and the water level information transmitted from the child station management device 12 in step S401. Subsequently, in step S402, the river management device 20, based on the received water level information and the reference water level of the reference water level table 6 stored in the storage unit 23 of the master station system 2, draws images to be combined with the river image. Determine the target standard water level. The drawing target reference water level determination process is the same as in the first embodiment.

Next, the river management device 20 generates a reference water level image in step S403. The river management device 20 calculates the shooting direction starting from the position of the image acquisition device 11 based on the position, posture, and angle information of the image acquisition device 11 included in the received information indicating the state of the image acquisition device 11. . As a method of calculating the shooting direction, for example, the rotation matrix shown in the following equation (1) is used to sequentially rotate the yaw angle ψ, pitch angle θ, roll angle φ, pan angle α, and tilt angle β. .

In addition, the river management device 20 stores, in the three-dimensional terrain data around the river stored in the storage unit 23, the water level held by the standard water level table 6, such as the standby water level for the flood fighting team, the flood warning water level, the evacuation determination water level, and the flood danger water level. Calculate the water surface position when the reference water level is reached. The river management device 20 identifies the imaging range of the image acquisition device 11 in the three-dimensional landform data from the imaging direction starting from the position of the image acquisition device 11 and the angle of view information acquired from the image acquisition device 11. By drawing the water surface position of the calculated reference water level in the imaging range, a reference water level image 7 is generated in which a reference water level line corresponding to the reference water surface position in the river image currently being photographed by the image acquisition device 11 is drawn. .

In step S404, the river management device 20 superimposes the reference water level line determined to be drawn in the reference water level image 7 on the river image received from the slave station management device 12 to generate a reference water level composite image. In step S405, the river management device 20 outputs the generated reference water level composite image to the display device 26, and the reference water level composite image is displayed on the display device 26. FIG. Output processing of the reference water level composite image is the same as in the first embodiment.

<Display screen in master station system 2>
A display screen displayed on the display device 26 of the master station system 2 will be described. The reference water level composite image generated by the river management device 20 is displayed in the reference water level composite image display area 91 shown in FIG. 8, as in the first embodiment.

FIG. 13 is a diagram showing changes in the reference water level composite image before and after changing the photographing range of the image acquisition device 11 . In this example, the direction of the lens of the image acquisition device 11 is moved to the left side of the screen and the zoom magnification is increased from before the change of the photographing range to after the change of the photographing range. As shown in the reference water level composite image shown in FIG. 13, the reference water level line displayed in the reference water level composite image has been changed to an appropriate position as the imaging range of the image acquisition device 11 is changed.

According to the configuration of this embodiment, a reference water level composite image obtained by superimposing a reference water level line indicating the reference water level on a river image obtained from an image acquisition device 11 installed at a river observatory or the like is installed at a river management office or the like. The position of the reference water level line is also changed in real time as the imaging range of the image acquisition device 11 is changed. As a result, the person in charge of river monitoring at the river management office can know what kind of situation the river will be in when the standard water level is reached due to an increase in water level, etc., even if the imaging range of the image acquisition device 11 is changed. It becomes possible to grasp easily.

Embodiment 3.
<Generation processing of reference water level composite image in master station system 2>
A reference water level composite image generation process according to the third embodiment will be described with reference to FIG. 14 . FIG. 14 shows a flow chart of the reference water level composite image generation processing performed by the river management device 20 of the master station system 2 . Here, in the master station system 2 of Embodiment 3, it is possible to predict whether or not a river disturbance will occur based on the water level information acquired from the water level gauge 10 and the river image acquired from the image acquisition device 11. there is Except for the generation processing of the reference water level composite image performed by the river management device 20 of the master station system 2 and the display screen displayed on the display device 26, the configuration is the same as that of the first or second embodiment.

The river management device 20 receives the river image and water level information transmitted from the slave station management device 12 in step S501. Subsequently, in step S502, the river management device 20, based on the received water level information and the reference water level of the reference water level table 6 stored in the storage unit 23 of the master station system 2, draws images to be combined with the river image. Determine the target standard water level. The drawing target reference water level determination process is the same as in the first embodiment.

Next, at step 503 , the river management device 20 determines the risk of river disturbance based on the water level information and the river image received from the child station management device 12 . Here, the river disturbance includes, for example, water leakage, scouring, law collapse, bank breakage, and the like. Leakage is the leakage of water from the river due to water pressure caused by rising water levels in the levee and the ground, and scouring is the removal of soil from the levee due to strong river flow and waves. That is. In addition, law collapse means that the slope of the embankment collapses due to the infiltration of rain or the flow of the river, and levee breach means that the embankment collapses and the river water flows out from the embankment.

Here, the storage unit of the river management device 20 holds a river disturbance determination algorithm learned in advance from teacher data including water level information and river images labeled with river disturbance information. The river disturbance determination algorithm is, for example, a machine learning algorithm, preferably a deep learning algorithm with a neural network structure.

The river management device 20 inputs the water level information and the river image received from the slave station management device 12 to the river disturbance determination algorithm, and obtains the determination result regarding the risk of river disturbance. Judgments regarding the risk of river disturbances are made for each of leakage, scouring, law collapse, and levee breach. For example, when it is determined that there is a danger of law collapse by the river obstruction determination algorithm, a flag indicating that there is a danger of law collapse is added to the input river image.

Next, in step S504, the river management device 20 superimposes the reference water level line determined as the drawing target on the river image received from the child station management device 12 to generate a reference water level composite image. Here, in addition to the reference water level line, a warning display 94 is combined with a river image to which a flag indicating that there is a risk of river disturbance is added by the river disturbance determination algorithm. The warning display 94 is, for example, a message "Risk of law collapse" when there is danger of law collapse. The warning display 94 is not limited to a message, and may be displayed as an illustration, an icon, or the like. As a result, a reference water level composite image is generated by combining the river image obtained from the image obtaining device 11 with the reference water level line and the warning display 94 .

Subsequently, in step S505, the river management device 20 outputs the generated reference water level composite image to the display device 26, and the reference water level composite image is displayed on the display device 26. FIG.

<Display screen in master station system 2>
A display screen displayed on the display device 26 of the master station system 2 will be described with reference to FIG. FIG. 15 shows a reference water level composite image on the display device 26. As shown in FIG. The reference water level composite image generated by the river management device 20 is displayed in the reference water level composite image display area 91 shown in FIG. 8, as in the first embodiment.

The reference water level composite image includes a warning display 94 indicating that there is a risk of river disturbance. By checking the warning display 94, the person in charge of river monitoring at the river management office can easily understand what kind of river disturbances are likely to occur in the current river.

According to the configuration of this embodiment, a reference water level composite image obtained by superimposing a reference water level line indicating the reference water level on a river image obtained from an image acquisition device 11 installed at a river observatory or the like is installed at a river management office or the like. A warning display 94 indicating the risk of river damage can be added to the reference water level composite image. As a result, for example, even an inexperienced person in charge of river monitoring can easily comprehend the state of the river and the risk of river damage when the standard water level is reached.

As the river management support system 100 shown in each embodiment, a slave station system 1 provided at a river observation station, a master station system 2 provided at a river management office, a system of a higher organization, and a system owned by general residents Although the configuration including a personal computer, etc., has been described, the configuration is not limited to this. For example, the river management support system 100 may be constructed by omitting part or all of the system of the host organization and the personal computers of general residents. Furthermore, the slave station system 1 and the master station system 2 do not need to have all the disclosed configurations, and some or all of them may be omitted.

Moreover, although the river management support system 100 shown in each embodiment is provided in the river management office, it is not limited to this. For example, the river management device 20 is installed in a facility managed by a company that provides a river management support service or a facility managed by a cloud provider, collects and processes information from each river observation station, and outputs the processing results via the network 4. The information may be transmitted to the river management office and necessary information may be displayed on the display device 26 .

The river management support system 100 shown in each embodiment is merely an example, and each embodiment can be appropriately combined, modified, or omitted within the scope of the technical idea shown in the embodiment. include.

11 image acquisition device, 20 river management device, 22 processing unit, 23 storage unit, 25 output unit, 26 display device, 100 river management support system.

Claims (10)

a processing unit that generates a reference water level composite image by superimposing a reference water level line indicating a reference water level on a river image acquired by an image acquisition device capable of changing an imaging range ;
an output unit that outputs the reference water level composite image generated by the processing unit;
with
The river management device, wherein the position of the reference water level line is changed in accordance with the change of the photographing range of the image acquisition device. 2. The river management device according to claim 1, wherein said reference water level is at least one selected from a flood danger water level, an evacuation judgment water level, a flood warning water level, and a water level for a flood fighting team. a processing unit that generates a reference water level composite image by superimposing a reference water level line indicating a reference water level on a river image acquired by the image acquisition device;
an output unit that outputs the reference water level composite image generated by the processing unit;
with
The processing unit superimposes the reference water level line indicating a reference water level higher than the current water level of the river on the river image, and does not superimpose the reference water level line indicating a reference water level lower than the current water level of the river on the river image. , a river management device that generates the reference water level composite image. further comprising a storage unit for storing three-dimensional terrain data of the river,
The river management apparatus according to any one of claims 1 to 3, wherein said processing unit draws said reference water level line corresponding to said river image based on said three-dimensional landform data stored in said storage unit. . The processing unit is
acquiring information indicating the state of the image acquisition device from the image acquisition device;
drawing the reference water level line corresponding to the river image based on the acquired information indicating the state of the image acquisition device and the three-dimensional terrain data;
The river management device according to claim 4. 6. The river management device according to claim 5, wherein the information indicating the state of said image acquisition device is information indicating at least one selected from the position, orientation, angle and angle of view of said image acquisition device. The processing unit analyzes the river image with a machine learning algorithm to generate information indicating predicted river obstacles,
The output unit outputs the information on the disturbance of the river generated by the processing unit.
The river management device according to any one of claims 1 to 6. an image acquisition device that acquires a river image and is capable of changing the imaging range ;
A processing unit for generating a reference water level composite image in which a reference water level line indicating a reference water level is superimposed on the river image obtained by the image obtaining device, and an output for outputting the reference water level composite image generated by the processing unit. a river management device having a section;
a display device for displaying the reference water level composite image output from the river management device;
with
A river management support system , wherein the position of the reference water level line is changed in accordance with the change of the photographing range of the image acquisition device . a step of acquiring a river image with an image acquisition device capable of changing the imaging range ;
generating a reference water level composite image by superimposing a reference water level line indicating a reference water level on the obtained river image;
a step of displaying the generated reference water level composite image;
a step of changing the position of the reference water line as the imaging range of the image acquisition device is changed;
A river management support method comprising: to the computer,
generating a standard water level composite image by superimposing a standard water level line indicating a standard water level on a river image acquired by an image acquisition device capable of changing an imaging range ;
a step of outputting the generated reference water level composite image;
a step of changing the position of the reference water line as the imaging range of the image acquisition device is changed;
A river management support program that runs

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