JP7102318B2 - Groundwater flow display system - Google Patents

Description

The present invention relates to a technique relating to groundwater, and more specifically, to a groundwater flow display system capable of visualizing the flow of groundwater.

It is said that the 21st century is the century of water, and in recent years, social interest in water or the water cycle as a resource has been increasing. Against this background, the Water Cycle Basic Law came into effect in July 2014, and in July 2015, the Cabinet decided on a water cycle basic plan to put the Water Cycle Basic Law into practice. This Basic Law on the Water Cycle aims to promote the water cycle measures comprehensively and integrally, and to maintain or restore a healthy water cycle to promote the sound development of the economy and society and improve the safety of people's lives, and the importance of the water cycle. The five basic principles are the public nature of water, consideration for a healthy water cycle, comprehensive management of the basin, and international cooperation on the water cycle.

Amid growing interest in water, the Secretariat of the Water Cycle Policy Headquarters of the Cabinet Office has certified activities related to basin management and groundwater management in each region as "basin water cycle plans" (Kumamoto City, Ohno City, Zama City, Hadano City, Azumino). City, etc.), promoting the Water Cycle Basic Law.

The water cycle is defined as "water circulates around the river basin as surface water or groundwater in the process of reaching the sea area by evaporation, descent, flow down or infiltration", and the flow of rivers and surface water. At the same time, the flow of groundwater is also important. However, since groundwater flows underground and in various strata, it is difficult to confirm its movement compared to surface water. Therefore, in order to grasp the flow of groundwater, it is now the mainstream to perform groundwater simulation. For example, Patent Document 1 proposes a technique of modeling a water cycle including groundwater, simulating water behavior by the model, and visualizing the simulation result on a map.

Japanese Unexamined Patent Publication No. 2011-013753

The above-mentioned water cycle basic plan states that "a groundwater council should be established in collaboration with local governments, local branch offices of the country, groundwater users, and other related parties", and "the composition of the groundwater council". The main actors will work together to establish a basic policy regarding grasping the actual condition of groundwater, conservation / utilization, recharge, dissemination and enlightenment, etc., and implement it step by step according to the actual conditions of the region. " In other words, the groundwater council, which is composed of different people, must share information on groundwater with each other. However, it is difficult to properly represent the flow of groundwater, and even if the simulation gives appropriate results, it is not easy to share it within the groundwater council.

Conventionally, to express the flow of groundwater, it is expressed by still images such as groundwater level contour lines, vector diagrams, and trace lines, or videos with time-series changes in groundwater level contour lines and particles moving on the trace lines. Although it was expressed by, none of them was effective enough to share the image.

An object of the present invention is to solve a conventional problem, that is, to provide a groundwater flow display system capable of intuitively grasping the flow of groundwater obtained by groundwater simulation or the like.

The present invention focuses on the point that the flow of groundwater is expressed at each point of interest by a "streamline" composed of a "tip point" indicating the tip of the flow and a "flow line segment" indicating the flow path. It is an invention made based on an idea that has never existed before.

The groundwater flow display system of the present invention is a system that visualizes the flow of groundwater in three dimensions, and includes a streamline creating means and a streamline displaying means. Of these, the streamline creating means is a means for creating a streamline for each of a plurality of points of interest set in the groundwater based on the three-dimensional flow velocity vector distribution, and the streamline displaying means is a means for creating a streamline for each point of interest. Is a means of displaying. The streamline is composed of a tip point and a flow line segment, and this tip point indicates the position of the point of interest at an arbitrary time, and the streamline segment is a point of interest that goes back a predetermined time from the arbitrary time. Shows the flow path.

The groundwater flow display system of the present invention can also be a system that creates a streamline by giving a display color according to the magnitude of the flow velocity.

The groundwater flow display system of the present invention can be a system that creates a streamline for each display time set in advance and outputs the streamline for each display time as a moving image in chronological order.

The groundwater flow display system of the present invention can also be a system further provided with a specific point of interest input means. This specific point of interest input means is a means for the operator to specify a desired point as a specific point of interest. In this case, the streamline display means creates the streamline of the specific point of interest based on the three-dimensional flow velocity vector distribution, and imparts a display color different from the streamline of the other point of interest to the streamline of the specific point of interest. ..

The groundwater flow display system of the present invention has the following effects.
(1) The flow of groundwater can be intuitively confirmed, and therefore information on groundwater can be shared among many people.
(2) For example, by sharing the flow of groundwater at the groundwater council, it is possible to find out the problems of the water cycle in the area and take effective countermeasures.
(3) By providing a function that allows the flow of three-dimensional groundwater to be viewed from an arbitrary viewpoint, the flow of groundwater can be confirmed in more detail.

(A) is an overall perspective view showing the flow of groundwater three-dimensionally displayed by the groundwater flow display system of the present invention, and (b) is a partial enlargement showing the flow of groundwater three-dimensionally displayed by the groundwater flow display system of the present invention. Perspective view. A model diagram showing a streamline consisting of a tip point and a flow line segment. The block diagram which shows the main structure of the groundwater flow display system of this invention. The flow chart which shows the main processing flow of the groundwater flow display system of this invention. A model diagram showing a streamline created with a short flow line segment due to a low flow velocity and a streamline created with a long flow line segment due to a high flow velocity. A model diagram schematically showing a moving image of a specific streamline with a display color (line thickness) different from the others moving from a starting point (specific point of interest) to a well.

An example of the embodiment of the groundwater flow display system of the present invention will be described with reference to the drawings.

First, the outline of the present invention will be described. The groundwater flow display system of the present invention is a system that displays the flow of groundwater (hereinafter referred to as “groundwater flow”) in three dimensions as shown in FIG. 1A and 1B are views showing a groundwater flow displayed by the groundwater flow display system of the present invention, where FIG. 1A is an overall perspective view and FIG. 1B is a partially enlarged perspective view.

Generally, groundwater flow is calculated from the analysis results of groundwater simulation (3D groundwater level distribution, 3D flow velocity vector distribution, 3D inter-small region flow amount) calculated based on hydraulic conditions such as water permeability coefficient and boundary conditions. Will be done. As the groundwater flow calculation method, various conventionally used methods can be used. For example, MODFLOW-2005, which is a lattice-centered three-dimensional difference method model by the United States Geological Survey (USGS), is used. It can be used in groundwater simulations, and the groundwater flow can be represented by particles, and then the movement of the particles can be calculated using the MODEPATH method also by the USGS. The groundwater flow analysis process can be incorporated into the groundwater flow display system of the present invention, or can be specified by using the results of separate analysis without incorporating it into the groundwater flow display system of the present invention. can.

The analyzed groundwater flow is displayed based on the "streamline 200" shown in FIG. As shown in this figure, the streamline 200 includes a "tip point 210" indicating the tip of the flow and a "flow line segment 220" indicating the flow path, and is formed in a shape like a so-called tadpole. More specifically, a streamline 200 is created for each of a plurality of points of interest set in the groundwater, and the position of the point of interest at the tip point 210 of the streamline 200 is shown, and the flow line is shown. Minute 220 shows a part of the flow path that has been followed so far.

Hereinafter, the groundwater flow display system of the present invention will be described in detail.

FIG. 3 is a block diagram showing a main configuration of the groundwater flow display system 100 of the present invention. As shown in this figure, the groundwater flow display system 100 includes a streamline creating means 101 and a streamline displaying means 102, and further includes a three-dimensional flow velocity vector distribution storage means 103 and a specific point of interest input hand 104. You can also do it.

The groundwater flow display system 100 can be manufactured as a dedicated one, or a general-purpose computer device can be used. This computer device can be configured by a personal computer (PC), a tablet-type PC, a mobile terminal including a smartphone, or the like. The computer device includes a processor such as a CPU and a memory such as a ROM and a RAM, and some computer devices further include an input means such as a mouse and a keyboard and a display. Further, the three-dimensional flow velocity vector distribution storage means 103 can be constructed on a database server, for example, can be placed on a local network (LAN: Local Area Network), or can be a cloud server that stores the data via the Internet.

FIG. 4 is a flow chart showing the main processing flow of the groundwater flow display system 100 of the present invention. The processing to be performed is shown in the center column, the input information required for the processing is shown in the left column, and the input information required for the processing is shown in the right column. Shows the output information generated from the processing. Hereinafter, the main processing flow of the groundwater flow display system 100 will be described with reference to this figure.

First, a large number (n in this case) points of interest are set within the groundwater range to be displayed (Step 10). The groundwater flow display system 100 creates a streamline 200 for each point of interest set here, and therefore the number and arrangement of points of interest may be appropriately set according to the purpose. When the point of interest is set, the streamline creating means 101 reads out the three-dimensional flow velocity vector distribution from the three-dimensional flow velocity vector distribution storage means 103, and creates a streamline 200 for each point of interest (Step 20). Here, the "three-dimensional flow velocity vector distribution" is obtained from the analysis result by the groundwater simulation and the actual measurement result of the groundwater flow, and is a three-dimensional distribution of the water flow (direction) for each time. In other words, the "three-dimensional flow velocity vector distribution" is a set of data composed of a combination of time, water flow, and three-dimensional coordinates, and the water flow is determined by specifying an arbitrary time and arbitrary coordinates.

The streamline creating means 101 that reads out the three-dimensional flow velocity vector distribution indicates the point of interest at that time as the tip point 210 based on the three-dimensional flow velocity vector distribution, and further flows from the point of interest that goes back a predetermined time from that time. The route is shown as the flow line segment 220. That is, the flow path that moves from the point of interest at a predetermined time is the flow line segment 220, and the tip point 210 is indicated at the tip thereof. Therefore, as shown in FIG. 5, the point of interest with a smaller flow velocity shows the flow line segment 220 shorter, and the point of interest with a higher flow velocity shows the flow line segment 220 longer. Alternatively, the streamline 200 can be created after dividing the flow velocity into a plurality of ranges and giving a display color to each range in advance and giving a display color of a range corresponding to the flow velocity. The "predetermined time", which is the moving time of the point of interest for obtaining the flow line segment 220, can be appropriately set according to the situation of confirming the groundwater flow.

When the streamline creation means 101 creates streamlines 200 for each point of interest, the streamline display means 102 displays these streamlines 200 as still images at an arbitrary time (designated time) (Step 30). At this time, the streamline 200 can be displayed by the flow line segment 220 having a length corresponding to the flow velocity, or the streamline 200 can be displayed by the display color according to the flow velocity. When the streamline 200 is displayed in the display color according to the flow velocity, both the tip point 210 and the flow line segment 220 may be displayed in the display color, or either the tip point 210 or the flow line segment 220 may be displayed. It may be displayed in the display color.

Since the three-dimensional flow velocity vector distribution has a time as a parameter, the groundwater flow can be displayed as a moving image by updating the still image according to the elapsed time. In this case, a display time is set in advance, and a large number of still images showing streamlines 200 are continuously displayed for each display time to display the images as a moving image (Step 50). In this case as well, the streamline 200 can be displayed with the flow line segment 220 having a length corresponding to the flow velocity, or the streamline 200 can be displayed with the display color according to the flow velocity, as in the display of the still image. When the streamline 200 is displayed in the display color according to the flow velocity, both the tip point 210 and the flow line segment 220 may be displayed in the display color, or either the tip point 210 or the flow line segment 220 may be displayed. It may be displayed in the display color.

This moving image represents a large number of points of interest shown in FIG. 1, that is, the movement of the streamline 200. By the way, among these many streamlines 200, it may be desired to confirm the movement of a specific streamline 200. For example, there may be a case where it is desired to confirm information such as what kind of flow path the liquid permeated from a certain point moves as a groundwater flow, or to what extent it spreads. In this case, it is preferable to use the specific point of interest input means 104. Hereinafter, the process of confirming the movement of the specific streamline 200 by using the specific point of interest input means 104 will be described in detail.

First, the operator designates a desired point of interest as a "specific point of interest" using the specific point of interest input means 104 (Step 40). By this operation, the specific point of interest designated by the operator is recognized, and the streamline display means 102 gives the specific point of interest a display color different from that of the other streamline 200 (hereinafter, "specification"). "Streamline") is created, and a moving image is displayed together with other streamlines 200 (Step 50). FIG. 6 is a model diagram schematically showing a moving image in which a specific streamline having a display color different from the others moves from a start point (that is, a position where a special focus point is specified) to a well (however, for convenience, it is displayed). The specific streamline is emphasized by the thickness of the line, not the color). As shown in this figure, a specific streamline having a display color different from that of the other streamlines 200 is particularly conspicuous (distinguishable from others), so that the movement of the specific streamline can be easily confirmed. .. In addition to changing the display color, the movement of a specific streamline is emphasized by changing the shape of the tip point 210, changing the line type of the flow line segment 220, and changing the line thickness of the flow line segment 220. You can also.

The groundwater flow display system of the present invention can be particularly effectively implemented when taking measures such as the water balance of groundwater and groundwater pollution. Considering that the invention of the present application contributes to the sharing of information and, by extension, to the maintenance or restoration of a sound water cycle, it can be said that the invention of the present application is not only industrially usable but also can be expected to make a great contribution to society.

100 Groundwater flow display system 101 (Groundwater flow display system) Streamline creation means 102 (Groundwater flow display system) Streamline display means 103 (Groundwater flow display system) 3D flow velocity vector distribution storage means 104 (Groundwater flow display system) ) Specific point of interest input hand 200 Streamline 210 (Consists of streamline) Tip point 220 (Constructs streamline) Flowline

Claims (4)

In a system that visualizes the flow of groundwater in three dimensions
A streamline creation means that creates a streamline for each of a plurality of points of interest set in the groundwater based on the three-dimensional flow velocity vector distribution.
A streamline display means for displaying the streamline for each point of interest is provided.
The streamline is composed of a tip point and a flow line segment.
The tip point indicates the position of the point of interest at an arbitrary time.
The flow line segment indicates a flow path of the point of interest that is traced back by a predetermined time from an arbitrary time.
The groundwater flow display system is characterized by this. The streamline creating means creates the streamline by giving a display color according to the magnitude of the flow velocity.
The groundwater flow display system according to claim 1, wherein the groundwater flow display system is characterized in that. The streamline creating means creates the streamline for each preset display time, and creates the streamline.
The streamline display means outputs the streamline for each display time as a moving image in chronological order.
The groundwater flow display system according to claim 1 or 2, wherein the groundwater flow display system is characterized in that. Further provided with a specific point of interest input means for the operator to specify a desired point as a specific point of interest.
The streamline display means creates the streamline of the specific point of interest based on a three-dimensional flow velocity vector distribution, and displays a display color different from that of the streamline of the other point of interest. Give to the line,
The groundwater flow display system according to any one of claims 1 to 3, wherein the groundwater flow display system is characterized.

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