Water management plan support device, water management plan support method, and water management plan support program

Abstract

To re-plan a water operation plan which suppresses a plan change range while considering lowering of residual salt concentration even when a mismatch occurs between the water operation plan and an achievement.SOLUTION: A water operation plan support device includes: a water operation planning unit which creates a water operation plan of a water supply facility on the basis of water demand prediction; a re-planning determination unit which calculates, by pondage prediction simulation for each distribution reservoir, water excess or deficiency in a distribution reservoir where constraint violation of pondage upper or lower limit occurs, and determines that re-planning of a water operation plan is necessary; a water accommodation distribution reservoir selection unit which calculates, for each of distribution reservoirs other than the distribution reservoir, water accommodation surplus capacity according to coordination of water receiving volume, and selects a distribution reservoir which performs water accommodation on the basis of residual salt concentration of each of the distribution reservoirs or the distribution reservoir when water accommodation is performed to the distribution reservoir from among each of distribution reservoirs having water accommodation surplus capacity being the excess or deficiency or more of the water in each of the distribution reservoirs; and a water operation plan correction unit which corrects a planning value of the water operation plan of the water supply facility so that an excess or deficient amount of water in the distribution reservoir is accommodated from the selected distribution reservoir.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water operations planning support device and method for formulating water operations plans such as water supply and distribution in water facilities such as water purification plants and water reservoirs, and supporting the water operations of the water facilities. [Background technology]

[0002] In the operation of water facilities such as water purification plants and distribution reservoirs, it is common to develop appropriate plans for water transmission and distribution (water operation plans) based on water demand forecasts for the distribution area, and to operate equipment such as pumps and valves based on the water operation plans. Water demand forecasts are made using statistical analysis methods such as multiple regression analysis, using data on factors that affect water demand, such as the day of the week and weather. Water operation plans are made using mathematical programming techniques based on the results of the water demand forecasts, so as to satisfy the upper and lower limit constraints of water facilities (upper and lower limit constraints on various water volumes).

[0003] Water management plans may differ from the plan due to errors in water demand forecasts. For example, there may be a discrepancy between the planned and actual water storage volume of a water reservoir, causing the actual water storage volume to deviate from its upper and lower limit constraints. In such cases, the water management plan is re-drafted (re-planned) using the latest water demand forecast results and the latest measured values.

[0004] The following technologies have been disclosed as technologies for replanning water operation plans. For example, Patent Document 1 discloses a technology that predicts water demand and creates a water operation plan based on the prediction, and replans if a deviation of a certain value or more is detected between the planned value and the actual value. Furthermore, the technology described in Patent Document 1 creates condition definition data that specifies which facilities among multiple water facilities are not subject to operation plan creation and which are subject to plan creation, and limits the replanning range based on the condition definition data and performs replanning, thereby limiting the range of plan changes and reducing the burden on operators of changing operations. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-222440 A Summary of the Invention [Problem to be solved by the invention]

[0006] According to the technology described in the above-mentioned Patent Document 1, replanning is performed so as to gradually expand the scope of plan changes based on the above-mentioned condition definition data until a plan proposal that satisfies the constraint conditions is obtained, so that a replan with a limited scope of plan changes may be obtained. However, in the above-mentioned conventional replanning method, since replanning is performed based on fixed condition definition data set in advance, depending on the water operation situation at that time, such as the water receiving volume and storage volume of the water distribution reservoir, a feasible solution may not be obtained even if replanning is performed, and replanning is repeated, that is, the scope of plan changes is expanded, and the scope of plan changes may be greatly expanded in the finally obtained replan proposal, which may increase the burden of operation changes on the operator. Furthermore, when the water operation plan is changed and water is diverted, there is a risk that the cost of adding chlorine increases due to a decrease in the residual salt concentration, but this point is not taken into consideration.

[0007] The present invention aims to provide a water operations planning support device, a water operations planning support method, and a water operations planning support program that are capable of replanning a water operations plan with limited scope of plan changes while taking into account a decrease in residual salt concentration, even if a discrepancy occurs between the water operations plan and actual results. [Means for solving the problem]

[0008] The water management plan support device according to the present invention has a processor and creates a water management plan for a water facility having a water purification plant and a plurality of water reservoirs, and includes a water management plan creation unit that creates a water management plan for the water facility based on a water demand forecast, a replanning determination unit that calculates the amount of water surplus or shortage in a water reservoir where a constraint violation regarding the upper and lower storage limits occurs based on a predicted value of the water storage volume obtained by a water storage volume forecast simulation in each water reservoir and predetermined upper and lower storage volume limits, and determines that replanning of the water management plan is necessary, and and a water operation plan correction unit that corrects the planned values ​​of the water operation plan of the water facility so that the surplus or deficit of water in the water reservoir is accommodated from the selected water reservoir. Effect of the Invention

[0009] According to the present invention, even if a discrepancy occurs between the water management plan and the actual results, it is possible to re-plan the water management plan while taking into account the decrease in residual salt concentration and limiting the scope of plan changes. [Brief description of the drawings]

[0010] [Figure 1] Schematic diagram of the overall configuration of a water supply system including the water operation planning support device [Diagram 2] An example of a water facility connection [Diagram 3] An example of a water purification plant information management table [Figure 4] An example of a water reservoir information management table [Diagram 5] An example of a water distribution area information management table [Figure 6] An example of a pipeline information management table [Figure 7] An example of a measurement data management table [Figure 8]An example of a water demand forecast result management table [Figure 9] An example of a water operation plan management table [Figure 10] An example of a demand forecast and water operation plan display screen [Figure 11] Flowchart of the process for determining the need for replanning the water operation plan [Figure 12] An example of a simulation result of the water storage volume of a water reservoir (when the water storage volume exceeds the upper limit) [Figure 13] An example of a simulation result of the water storage volume of a water reservoir (when the water storage volume falls below the lower limit) [Figure 14] An example of the results of a simulation of the water storage volume of a water reservoir where no constraint violations have occurred [Figure 15] Flowchart of the process for selecting a water reservoir for water exchange [Figure 16] Flowchart of the process for calculating the risk of a decrease in the residual salinity concentration of the receiving water of each water reservoir candidate for water exchange [Figure 17] An example of change in pipeline flow rate due to water supply and demand [Figure 18] Relationship between elapsed time (flow time, residence time) and residual salt concentration [Figure 19] An example of the relationship between residual salt concentration and the risk of reduced residual salt concentration [Figure 20] Flowchart of the process for calculating the risk of a decrease in the residual salinity concentration of each water reservoir that is a candidate for water exchange [Figure 21] Flowchart of the process for calculating the risk of shortage of water reserves in each water reservoir that is a candidate for water sharing [Figure 22] Example of the relationship between available water supply time and risk of water storage shortage [Figure 23] Flowchart of the process for modifying the water operation plan [Figure 24A] An example of how to revise the water management plan when water is exchanged in the target river system [Figure 24B] An example of how to revise the water management plan when water is exchanged in the target river system DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below. The following description and drawings are examples for explaining the present invention, and are omitted and simplified as appropriate for clarity of explanation. The present invention can be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

[0012] In order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

[0013] In the following explanation, various information may be described using expressions such as "table" and "list", but the various information may be expressed in other data structures. To indicate independence of data structure, "XX table", "XX list", etc. may be referred to as "XX information". When describing identification information, when expressions such as "identification information", "identifier", "name", "ID", "number", etc. are used, these are interchangeable.

[0014] When there are multiple components having the same or similar functions, they may be described by using the same reference numerals with different subscripts. However, when there is no need to distinguish between these multiple components, the subscripts may be omitted.

[0015] In addition, in the following description, processing performed by executing a program may be described, but the program is executed by a processor (e.g., a CPU (Central Processing Unit), a GPU (Graphics Processing Unit)) to perform a defined process using storage resources (e.g., a memory) and / or an interface device (e.g., a communication port) as appropriate, so the subject of the processing may be the processor. Similarly, the subject of the processing performed by executing a program may be a controller, device, system, computer, or node having a processor. The subject of the processing performed by executing a program may be a calculation unit, and may include a dedicated circuit (e.g., an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit)) that performs a specific process.

[0016] A program may be installed in a device such as a computer from a program source. The program source may be, for example, a program distribution server or a computer-readable storage medium. When the program source is a program distribution server, the program distribution server may include a processor and a storage resource for storing a program to be distributed, and the processor of the program distribution server may distribute the program to be distributed to other computers. In the following description, two or more programs may be realized as one program, and one program may be realized as two or more programs.

[0017] FIG. 1 shows a schematic diagram of the overall configuration of a water supply system 102 including a water management plan support device 101 according to one embodiment of the present invention, a monitoring and control system, a water purification plant, a water reservoir, pipelines, a network, and the like.

[0018] Water purified at the water purification plant 103 is transported through water transmission pipes by pumps (not shown) within the water purification plant to distribution reservoirs 105, 106, and 107. An appropriate amount of water is received at each distribution reservoir by a receiving valve (not shown). The received water is temporarily stored in each distribution reservoir, and then distributed by pumps (not shown) within each reservoir via a distribution pipe network or via other distribution reservoirs 108 and 109 to distribution areas 110, 111, 112, and 113, respectively.

[0019] The water purification plant 103 measures the amount of water sent at a predetermined period (for example, every minute), and the water reservoirs 105-109 measure the amount of water received, the amount of water stored, and the amount of water distributed at a predetermined period, and transmit the measured values ​​to a supervisory control and data acquisition (SCADA) system 114. The supervisory control and data acquisition system 114 acquires the measured values ​​of the amount of water sent from the water purification plant 103 and the measured values ​​of the amount of water received, the amount of water stored, and the amount of water distributed from the water reservoirs 105-109, and calculates the sum or average of the measured values ​​for one hour to calculate the amount of water sent, the amount of water received, the amount of water stored, and the amount of water distributed for each hour. The supervisory control and data acquisition system 114 also calculates the amount of water demand for each water distribution area 110-113 for each hour, and saves the calculated measured value data. The water operation plan support device 101 is connected to the supervisory control and data acquisition system 114 via a network 115.

[0020] The water management planning support device 101 is a general computer system consisting of a CPU 1011, a memory device (storage 1012 such as a hard disk, and memory 1013 such as RAM or flash memory), an input unit 121 (keyboard, mouse, etc.) which is an input interface (I / F) 1014, and a display unit 122 (display, printer, etc.) which is an output I / F 1015.

[0021] The memory 1013 of the storage device stores a facility information registration unit 123, a measurement data acquisition unit 124, a water demand forecasting unit 125, a water management planning unit 126, a water management plan presentation unit 127, a water management plan instruction unit 128, a re-planning judgment unit 129, a water exchange adjustment reserve calculation unit 130, a residual salt concentration decline risk judgment unit 131, a stockpiled water shortage risk judgment unit 132, a water exchange reservoir selection unit 133, and a water management plan correction unit 134 as programs, and the CPU 1011 executes these programs.

[0022] In addition, the storage 1012 of the memory device stores a water purification plant information management table 141, a water distribution reservoir information management table 142, a water distribution area information management table 143, a pipeline information management table 144, a measurement data management table 145, a water demand forecast result management table 146, and a water operation plan management table 147 as data, which can be used when executing the above program.

[0023] The facility information registration unit 123 is a program that registers information about the water purification plant and the water reservoir input by the administrator in a predetermined table. The measurement data acquisition unit 124 is a program that acquires each measurement data, such as the water supply amount of each water purification plant, the water receiving amount, storage amount, and distribution amount of each water reservoir, and the water demand amount of the water distribution area, during a predetermined period transmitted from the monitoring and control system 114, and registers it in a predetermined table. The water demand prediction unit 125 is a program that predicts the water demand amount of each water distribution area during a predetermined period. The water operation planning unit 126 is a program that plans the water supply amount of each water purification plant, the water receiving amount, storage amount, and distribution amount of each water reservoir during a predetermined period, i.e., a water operation plan, based on the water demand prediction result. The water operation plan presentation unit 127 is a program that presents the proposed / modified water operation plan, the demand prediction result, and the like on a display device. The water operation plan instruction unit 128 is a program that transmits the proposed / modified water operation plan to the monitoring and control system 114. The re-planning determination unit 129 is a program that uses the latest water demand forecast results and the latest measurement data to calculate the deviation (surplus or shortage) between the planned and predicted values ​​of the water reservoir storage volume, and determines the need for re-planning the water management plan.

[0024] The water transfer adjustment margin calculation unit 130 is a program that calculates the adjustment margin of the amount of water transfer (sending / receiving) that other reservoirs can perform depending on the increase / decrease in the amount of water received by a reservoir where a water surplus or shortage is expected. The residual salinity concentration decrease risk determination unit 131 is a program that determines the risk of a decrease in the amount of water sent or the residual salinity concentration of the reservoir's storage volume when water transfer is performed from another reservoir to a reservoir where a water surplus or shortage is expected. The reserve water volume shortage risk determination unit 132 is a program that determines the risk of a reserve water volume shortage in a reservoir when water transfer is performed from another reservoir to a reservoir where a water surplus or shortage is expected. The water transfer reservoir selection unit 133 is a program that selects a reservoir that will transfer water to a reservoir where a water surplus or shortage is expected. The water operation plan correction unit 134 is a program that corrects the water operation plan by transferring water from another reservoir to a reservoir where a water surplus or shortage is expected.

[0025] The water purification plant information management table 141 is a table for managing information on each water purification plant. The water distribution reservoir information management table 142 is a table for managing information on each water distribution reservoir. The water distribution area information management table 143 is a table for managing information on each water distribution area. The pipeline information management table 144 is a table for managing information on each pipeline. The measurement data management table 145 is a table for managing each actual data such as the amount of water sent from the water purification plant, the amount of water received by the water distribution reservoir, the amount of water stored, the amount of water distributed, and the water demand in the water distribution area, which are obtained from the monitoring and control system 110. The water demand prediction result management table 146 is a table for managing the water demand prediction result data for each water distribution area for a specified period. The water operation plan management table 147 is a table for managing the water operation plan in the water supply system 102.

[0026] In an embodiment of the present invention, the water management plan support system 101 executes the following steps (1) to (8) to modify the water management plan so that even if a deviation in the water management plan (water surplus or shortage) occurs in any of the water reservoirs, water is accommodated (sent / received) from the specified water reservoir to the reservoir where the deviation occurred by increasing or decreasing the amount of water received. This makes it possible to modify the water management plan with a minimum scope of change. (1) Registering facility information (2) Acquisition of measurement data (3) Prediction of water demand in each water distribution area (4) Water management plan (5) Presentation of water demand forecast results and water operation plans (6) Determining the need for replanning (7) Calculation of water exchange adjustment capacity of each water reservoir (8) Selection of reservoirs for water sharing (9) Amendment of water management plan (10) Presentation of revised water management plan

[0027] A method for implementing the processes (1) to (10) will be described below with reference to FIGS.

[0028] First, the facility information registration process (1) will be described. An example of the connection relationship of water facilities to be registered is shown in Fig. 2. The administrator of the water operation plan support device 101 inputs, in advance, from the input unit 121, the names of the water purification plants 103 and 104 and the upper and lower limits of the water supply volume as information on the water purification plants, the names of the water distribution reservoirs 105-109, the upper and lower limits of the received water volume, the upper and lower limits of the stored water volume, and the upper and lower limits of the distributed water volume as information on the distributing reservoirs, the names of the water distribution areas 110-113 and the average demand volume as information on the water distribution areas, and the names, lengths, diameters, and names of the connected facilities of the pipelines 211-226.

[0029] The facility information registration unit 123 of the water management plan support device 101 registers the input information for each of the input entries of the water purification plant, the distributing reservoir, the water distribution area, and the pipeline in the water purification plant information management table 141, the water distribution reservoir information management table 142, the water distribution area information management table 143, and the pipeline information management table 144. Figures 3, 4, 5, and 6 show examples of the water purification plant information management table 141, the water distribution reservoir information management table 142, the water distribution area information management table 143, and the pipeline information management table 144, respectively, registered by the facility information registration unit 123. In the manner described above, the facility information registration process is performed by the facility information registration unit 123.

[0030] Next, the measurement data acquisition process (2) will be described. The monitoring and control system 114 transmits the measurement time and measurement value data to the water management plan support device 101 via the network 115 every time it tallies the water supply volume of each water purification plant, the received water volume, stored water volume, and distributed water volume of each water reservoir, and the water demand volume of each water distribution area in one-hour increments for each hour of the target water system. The measurement data acquisition unit 124 of the water management plan support device 101 sequentially acquires each of the transmitted measurement value data and its measurement time, and registers them in the measurement data management table 145. An example of the measurement data management table 145 registered by the measurement data acquisition unit 124 is shown in FIG. 7. The measurement data acquisition process is performed by the measurement data acquisition unit 124 in the above-mentioned manner.

[0031] Next, the prediction process (3) of the water demand for each water distribution area will be described. This process (3) is basically executed once a day at a predetermined time (for example, 8:00 a.m.), but is also executed when determining whether or not the water management plan needs to be re-planned, as described later. The time series pattern of the daily water demand generally changes depending on the weather, the day of the week (whether it is a weekday or a holiday), the most recent water demand time series data, and the like. The water demand prediction unit 125 of the water management plan support device 101 is equipped with a water demand prediction model for each water distribution area 110 to 113 that has been constructed in advance using statistical analysis technology, machine learning, and the like, and predicts the water demand for each water distribution area using the weather and day of the week on the prediction date and the most recent water demand time series data for each water distribution area as input data, and calculates the prediction result of the water demand for each water distribution area in one-hour increments from the present time to 48 hours ahead. The water demand prediction unit 125 then registers the calculated prediction result of the water demand for each water distribution area in the water demand prediction result management table 146. 8 shows an example of the water demand prediction result management table 146 registered by the water demand prediction unit 125. As described above, the water demand prediction unit 125 performs the process of predicting the water demand in each water distribution area.

[0032] Next, the water management plan creation process (4) will be described. This process (4) is executed after the above process (2) is performed once a day. The water management plan unit 126 of the water management plan support device 101 solves the water management plan problem in the target water system to create plans for the water supply volume of each water purification plant, the water receiving volume, storage volume, and distribution volume of each water reservoir, etc., in one-hour increments from the present time up to 48 hours into the future, i.e., a water management plan.

[0033] A detailed explanation of the water management planning problem is omitted because it is not related to the purpose of the present invention. However, to briefly explain it using the water facility shown in FIG. 2, for example, the water management planning problem is based on the following constraints: Water balance equation for each node 201-205 (for each time 1-48 (however, the time interval is 1 hour), the sum of the inflow to the node = the outflow from the node) Water balance equation for each reservoir 105-109 (for each time 2-48, the change in reservoir water volume from the previous time = received water volume (inflow volume) - distributed water volume (outflow volume), the initial value of the reservoir water volume is set to the measured value) Water balance equation for each water distribution area 110-113 (inflow to water distribution area = water demand forecast result at each time 1-48) Upper and lower limits of water supply volume for each water purification plant 103, 104 (times 1 to 48) Upper and lower limits of the amount of water received, stored, and distributed in each reservoir 105-109 (at each time 1-48) and the following objective function: - Equalization of the water supply volume at each water purification plant 103, 104 (minimization of the sum of the absolute values ​​of the change in the water supply volume from the previous time at each time 2 to 48) (The objective function can be linearized by removing the absolute value symbol.)

[0034] The water management planning unit 126 solves the water management planning problem using numerical analysis software such as MATLAB (registered trademark) or GUROBI to create plans for the water supply volume of each water purification plant, the water receiving volume, storage volume, and distribution volume of each water reservoir in one-hour increments for the next 48 hours from the present time, i.e., a water management plan, and registers the created water management plan in a water management plan management table 147. Figure 9 shows an example of the water management plan management table 147 registered by the water management planning unit 126. In this manner, the water management plan creation process is performed by the water management planning unit 126.

[0035] Next, the presentation of the water demand forecast results and the water management plan (5) will be described. This process (5) is executed after the water demand forecast process (3) and the water management plan formulation process (4) have been performed. The water management plan presentation unit 127 of the water management plan support device 101 acquires the water demand forecast results for each of the water distribution areas 110-113 from the water demand forecast result management table 146, and also acquires the planned values ​​of the water supply volume of each of the water purification plants 103 and 104, and the received water volume, stored water volume, and distributed water volume of each of the water distribution reservoirs 105-109 from the water management plan management table 147, creates a demand forecast and water management plan display screen that displays the above data in graphs, and displays it on the display unit 122. FIG. 10 shows an example of the demand forecast and water management plan display screen created by the water management plan presentation unit 127.

[0036] The administrator of the water operations plan support device 101 checks the demand forecast and water operations plan display screens, and if it is determined that there are no problems with the demand forecast results and the water operations plan, inputs the execution of the water operations plan from the input unit 121. The water operations plan instruction unit 128 of the water operations plan support device 101 transmits the latest water operations plan to the monitoring and control system 114 via the network 115. The monitoring and control system 114 receives the water operations plan, and operates equipment such as pumps and valves in each water purification plant and reservoir based on the water operations plan. In this manner, the water operations plan presentation unit 127 presents the water demand forecast results and the water operations plan.

[0037] Next, the process (6) for determining the need for replanning will be described. This process (6) is executed periodically (e.g., every six hours) while the water management plan formulation process (4) is being performed and equipment such as pumps and valves at each water purification plant and reservoir are operating based on the water management plan. Figure 11 shows a flowchart of the process for determining the need for replanning the water management plan.

[0038] In step S1101, the water demand prediction unit 125, like the water demand prediction process (3) above, uses the latest weather and the most recent water demand time-series data for each water distribution area as input data and predicts the water demand for each water distribution area for the remaining time from the current time in the water management plan (for example, 48-6=42 hours in the case of a judgment made 6 hours after the water management plan was created). The water demand prediction unit 125 then registers the calculated prediction results of the latest water demand for each water distribution area in the water demand prediction result management table 146.

[0039] In step S1102, the re-planning determination unit 129 of the water management plan support device 101 performs a water storage volume simulation in each of the distributing reservoirs 105-107, 109 distributing water to each water distribution area when the latest water demand forecast result is used. That is, the latest actual value (Fig. 7) is used as the initial value of each distributing reservoir, the planned value (Fig. 9) is used for the inflow volume to the distributing reservoir (received water volume), and the latest demand forecast result (Fig. 8) is used for the outflow volume from the distributing reservoir (distributed water volume), and a water storage volume forecast simulation for the remaining time is performed by water balance calculation.

[0040] In step S1103, the re-planning determination unit 129 determines whether the predicted water volume in any of the reservoirs deviates from the upper or lower limit of the water volume based on the simulation results. If the predicted water volume deviates, the process proceeds to step S1104. If the predicted water volume deviates, the process proceeds to step S1105.

[0041] In step S1104, the re-planning determination unit 129 determines that re-planning is not necessary, and the process proceeds to step S1101. Then, the processes of steps S1101 to S1103 are periodically repeated.

[0042] In step S1105, the re-planning determination unit 129 determines that re-planning is necessary. An example of the results of the simulation of the water storage volume of a water reservoir is shown in Fig. 12 and Fig. 13. When the planned value and predicted value of the water storage volume are as shown in Fig. 12, that is, when the predicted water storage volume value deviates from (exceeds) its upper limit value, there is an excess of water. When the planned value and predicted value of the water storage volume are as shown in Fig. 13, that is, when the predicted water storage volume value deviates from (falls below) its lower limit value, there is a shortage of water. The re-planning determination unit 129 calculates the deviation of the predicted water storage volume value from the upper and lower limits, and calculates the amount of water surplus or shortage in the water reservoir that will cause a constraint violation and the time when the violation will occur.

[0043] As described above, the water demand forecasting unit 125 and the re-planning determination unit 129 perform the process of determining whether re-planning is necessary.

[0044] Next, the calculation process (7) of the water transfer adjustment capacity of each reservoir will be described. This process (7) is executed after the process (6) of determining the necessity of replanning has been performed. When there is a shortage of water in reservoir A, which causes a constraint violation, the amount of water received by reservoir B is reduced and the amount of water received by reservoir A is increased to resolve the water shortage, so the water transfer adjustment capacity is the amount of water that can be sent when the amount of water received is reduced as much as possible. When there is an excess of water in reservoir A, the amount of water received by reservoir B is increased and the amount of water received by reservoir A is reduced to resolve the excess of water, so the water transfer adjustment capacity is the amount of water that can be accepted when the amount of water received is increased as much as possible.

[0045] The water exchange adjustment capacity calculation unit 130 of the water management plan support device 101 calculates the water exchange adjustment capacity for the reservoirs 105-107, 109 for which a storage capacity simulation was performed in the above process (6) based on the results of the storage capacity simulation for each reservoir. FIG. 14 shows an example of the results of the storage capacity simulation for each reservoir for which no constraint violations have occurred. The amount of water that can be sent out is calculated as the difference between the minimum value of the predicted storage capacity during the simulation period and the lower limit of the storage capacity. The amount of water that can be accepted is calculated as the difference between the upper limit of the storage capacity and the maximum value of the predicted storage capacity. For the reservoir 108 for which a storage capacity simulation was not performed (a reservoir that does not directly distribute water to the distribution area), the water exchange adjustment capacity is calculated based on the latest water management plan.

[0046] Similar to the method for calculating the water transfer adjustment capacity based on the simulation results above, the amount of water that can be sent is calculated as the difference between the minimum planned water storage volume for the remaining planning period and the lower limit of the water storage volume. The amount of water that can be accepted is calculated as the difference between the upper limit of the water storage volume and the maximum planned water storage volume. However, water transfer is to be carried out as early and as quickly as possible within the range permitted by the upper and lower limit constraints on the amount of water received (maximum or minimum amount of water received). If water transfer is carried out as early and as quickly as possible but is not completed by the time the violation occurs (if the amount of water that can be sent / accepted does not reach the amount that can be sent / accepted by the time the violation occurs), the actual amount of water transfer adjustment capacity is calculated as the amount of water that can be sent / accepted by the time the violation occurs.

[0047] In the manner described above, the water interchange adjustment reserve capacity calculation unit 130 performs the calculation process of the water interchange adjustment reserve capacity of each water reservoir.

[0048] Next, the process (8) of selecting a reservoir to which water will be transferred will be described. This process (8) is executed after the process (7) of calculating the water transfer adjustment margin of each reservoir. Figure 15 shows a flowchart of the process of selecting a reservoir to which water will be transferred for reservoir A, which has a constraint violation (water surplus or shortage).

[0049] In step 1501, the water exchange reservoir selection unit 133 of the water management plan support device 101 selects multiple reservoirs with water exchange adjustment capacity (the amount that can be sent in the case of water shortage, and the amount that can be accepted in the case of water excess) that is greater than the water surplus or shortage of reservoir A, which causes a constraint violation, as candidates for reservoirs that will exchange water with reservoir A. The processes of steps 1502, 1503, and 1504 described below may be performed by the water exchange reservoir selection unit 133.

[0050] In step 1502, the residual salinity reduction risk determination unit 131 of the water management plan support device 101 calculates the residual salinity of the received water of all distributing reservoirs that has decreased due to a change in the flow of water sent from the water purification plant (increase in flow arrival time) when each distributing reservoir C of the water exchange candidate exchanges water with the distributing reservoir A, and calculates the risk of a decrease in the received water residual salinity of each distributing reservoir C of the water exchange candidate. The process performed in step 1502 will now be described in detail using a flowchart. Figure 16 shows a flowchart of the process performed in step S1502 to calculate the risk of a decrease in the received water residual salinity of each distributing reservoir C of the water exchange candidate.

[0051] As described below, the residual salt concentration decrease risk assessment unit 131 (or the reservoir selection unit 133) selects a reservoir based on the level of the residual salt concentration in the receiving water of the reservoir, which changes with the change in the flow of water when water is transferred from the selected reservoir to the reservoir where the constraint violation occurs. This makes it possible to select a reservoir to which water is transferred, taking into account the residual salt concentration in the receiving water that occurs with an increase in the flow time.

[0052] In step S1601, the residual salt concentration decrease risk determination unit 131 assumes one distributing reservoir D to which water will be exchanged from among the distributing reservoirs C that are candidates for water exchange.

[0053] In step S1602, the residual salt concentration reduction risk assessment unit 131 calculates the changed pipeline flow rates when water is accommodated (sent / received) from reservoir D to reservoir A where a constraint violation occurs, via the shortest route. At this time, water accommodation is performed in the shortest time (within one hour, if possible), but if it takes multiple hours to complete the water accommodation due to upper and lower limit constraints on the amount of water received by each reservoir, the changed pipeline flow rates for multiple hours are calculated. Figure 17 shows an example of changes in pipeline flow rates due to water accommodation. Figure 17(1) shows the planned value of the amount of water to be sent from the water purification plant 103 to the reservoirs 105-107 at a specified time. Here, if a water supply of 200m is required for reservoir 106, 3 of water excess occurs, and 200m 3 When water is transferred (accepted) from the reservoir 105, which has the above-mentioned water transfer adjustment capacity (available), to the reservoir 106, the flow rate of each pipeline changes as shown in FIG. 17(2).

[0054] In step S1603, the residual salt concentration reduction risk determination unit 131 calculates the time it takes for the water to reach all of the reservoirs from the water purification plant based on the changed flow rate of each pipeline when water is accommodated. 3 The flow rate (= flow rate / cross-sectional area of ​​pipeline) and the flow time (= length / flow rate) of each pipeline can then be calculated using the flow rate (= flow rate / cross-sectional area of ​​pipeline), the length of the pipeline (m), and the diameter (mm), and the sum of the flow times of each pipeline can be used to calculate the flow time of water from the water purification plant to each distribution reservoir.

[0055] Then, the residual salt concentration reduction risk determination unit 131 uses the flow time calculated above and the initial residual salt concentration of the water delivered from the water purification plant to calculate the residual salt concentration using the following formula: Residual salt concentration Z(mg / L)=Z0·exp(-k·t) where Z0 is the initial residual salt concentration, k is a coefficient, and t is the elapsed time (time to reach the target). Based on this, the residual salinity of the receiving water of all the distribution reservoirs is calculated. Figure 18 shows the relationship between elapsed time (flow time, retention time) and residual salinity. As time passes, the residual salinity of the water decreases.

[0056] Therefore, in the example of FIG. 17(2), the flow rate of the pipeline 217 is set to the planned value of 4000 m 3 / h to 3800m 3 / h, the time it takes for the water to reach the pipeline 217 will be extended, and there is a possibility that the residual salt concentration in the downstream water reservoirs 106 and 107 will be lower than planned.

[0057] In step 1604, the residual salt concentration reduction risk determination unit 131 finds the minimum value of the residual salt concentration of the receiving water of all the distributing reservoirs calculated above, and calculates the risk of a reduction in the receiving water residual salt concentration of distributing reservoir D based on a predetermined relationship between the residual salt concentration of the receiving water and the risk of a reduction in the receiving water residual salt concentration. An example of the relationship between the residual salt concentration and the risk of a reduction in the residual salt concentration is shown in Figure 19. As shown in Figure 19, it can be seen that the relationship between the two is set so that the smaller the value of the residual salt concentration, the higher the risk of a reduction in the residual salt concentration.

[0058] In step S1605, the residual salinity concentration decrease risk determination unit 131 repeats the above steps S1601 to S1604 to calculate the received water residual salinity concentration decrease risk for each of the distributing reservoirs C of all the water exchange candidates.

[0059] Returning to the explanation of the process for selecting a reservoir from which water will be exchanged.

[0060] In step 1503, the residual salinity drop risk determination unit 131 of the water management plan support device 101 calculates the residual salinity of the reservoir C that has dropped with an increase in the amount of water received (increase in the amount of water stored, increase in retention time) when each reservoir C of the water exchange candidate exchanges water with the reservoir A (accepting excess water from the reservoir A) in the case where excess water is expected in the reservoir A, and calculates the risk of drop in the residual salinity of the reservoir C of the water exchange candidate. In step 1503, in the case where a shortage of water is expected in the reservoir A, the amount of water stored in the reservoir C does not increase, so the risk of drop in the residual salinity of the reservoir may be set to 0. Here, the process performed in step 1503 will be described in detail using a flowchart. FIG. 20 shows a flowchart of the process performed in step 1503 to calculate the risk of drop in the residual salinity of the reservoir C of the water exchange candidate.

[0061] As described below, the residual salt concentration decrease risk determination unit 131 (or the reservoir selection unit 133) selects a reservoir based on the level of the residual salt concentration of the reservoir when water is transferred from the selected reservoir to the reservoir where the constraint violation occurs. This makes it possible to select a reservoir to which water is transferred, taking into account the residual salt concentration of the reservoir that increases with the amount of stored water and the retention time.

[0062] In step S2001, the residual salt concentration decrease risk determination unit 131 assumes one distributing reservoir D that will accommodate (accept) water from among the distributing reservoirs C that are candidates for water accommodation.

[0063] In step S2002, the residual salt concentration reduction risk determination unit 131 calculates the retention time of water in the reservoir D that increases due to water accommodation (acceptance). Here, the retention time of water in the reservoir is calculated by the average water volume (m 3 ) / Average amount of water received (m 3 / h). In this case, since reservoir D will take on the excess water from reservoir A in the shortest possible time, and the increased water storage state will continue thereafter, the average water storage volume can be calculated by adding the above-mentioned take-up volume (= excess water from reservoir A) to the average planned water storage volume for the remaining planning period. The average incoming water volume will temporarily increase due to the taking-up of excess water from reservoir A, but will return to the original planned water intake volume value once the taking-up is complete, so the average planned water intake volume value for the remaining period can be used as is.

[0064] Then, the residual salt concentration reduction risk assessment unit 131 uses the calculated retention time and the initial residual salt concentration of the water flowing into the distributing reservoir (assuming that chlorine is injected at the time the water flows into the distributing reservoir, resulting in a predetermined initial residual salt concentration) to calculate the residual salt concentration of the stored water after retention in the distributing reservoir D based on the residual salt concentration calculation formula described above.

[0065] In step S2003, the residual salt concentration reduction risk determination unit 131 calculates the risk of a decrease in the residual salt concentration of the stored water in reservoir D from the residual salt concentration of the stored water in reservoir D calculated above, based on a predetermined relationship between the residual salt concentration and the risk of a decrease in the residual salt concentration as shown in Figure 19.

[0066] In step S2004, the residual salinity concentration decrease risk determination unit 131 repeats the above steps S2001 to S2003 to calculate the received water residual salinity concentration decrease risk for all of the water exchange candidate distributing reservoirs C.

[0067] Returning to the explanation of the process for selecting a reservoir from which water will be exchanged.

[0068] In step 1504, the reserve water shortage risk determination unit 132 of the water management plan support device 101 calculates the time when water can be distributed to the water distribution area of ​​the reservoir C, which has decreased with the decrease in the amount of received water (decrease in the amount of stored water), when each reservoir C of the water exchange candidate exchanges water to the reservoir A (submission of water to the reservoir A for the shortage water), in the case where a water shortage is expected in the reservoir A, and calculates the reserve water shortage risk of each reservoir C of the water exchange candidate. In this step 1504, in the case where an excess of water is expected in the reservoir A, the reserve water shortage risk may be set to 0 because there is no increase in the amount of stored water in the reservoir C. Here, the process performed in step 1504 will be described in detail using a flowchart. FIG. 21 shows a flowchart of the process performed in step 1504 to calculate the reserve water shortage risk of each reservoir C of the water exchange candidate.

[0069] As described below, the reserve water volume shortage risk determination unit 132 (or the reservoir selection unit 133) selects a reservoir based on the amount of water stored in the selected reservoir when water is transferred from the selected reservoir to the reservoir where the constraint violation occurs. This makes it possible to select a reservoir to which water is transferred, taking into account the reserve water volume of the reservoir.

[0070] In step S2101, the reserve water volume shortage risk determination unit 132 assumes one distributing reservoir D to provide water from among the water supply candidate distributing reservoirs C.

[0071] In step S2102, the reserve water shortage risk determination unit 132 calculates the available water supply time for the water supply area of ​​the reservoir D (the duration of water supply to the water supply area when the reservoir's water volume is at its lowest) that is reduced by water supply (supply). 3 ) / average demand (m 3 / h). In this case, since Reservoir D will release the water shortage from Reservoir A in the shortest possible time, and the reduced water volume will continue thereafter, the minimum water storage volume can be calculated by subtracting the release volume (= water shortage from Reservoir A) from the minimum planned water storage volume for the remaining planning period. The average demand can be calculated by the average value of the forecasted demand volume for the remaining period.

[0072] In step S2103, the stockpiled water volume shortage risk determination unit 132 calculates the risk of stockpiled water volume shortage for reservoir D from the above-calculated available water distribution time for reservoir D, based on a predetermined relationship between the available water distribution time and the risk of stockpiled water volume shortage. An example of the relationship between the available water distribution time and the risk of stockpiled water volume shortage is shown in Figure 22. As shown in Figure 22, the relationship between the two is determined so that the risk of stockpiled water volume shortage increases as the available water distribution time value decreases.

[0073] In step S2104, the reserve water volume shortage risk determination unit 132 repeats the above steps S2101 to S2103, and calculates the reserve water volume shortage risk for all of the water exchange candidate water reservoirs C.

[0074] Returning to the explanation of the process for selecting a reservoir from which water will be exchanged.

[0075] In step 1505, the water exchange reservoir selection unit 133 calculates a total risk by adding up the risk of a decrease in the residual salinity concentration in the receiving water, the risk of a decrease in the residual salinity concentration in the stored water, and the risk of a shortage of stored water for each of the water exchange candidate reservoirs C, and selects one of the reservoirs with the smallest total risk as the water exchange reservoir B that will exchange water with water reservoir A.

[0076] As described above, the water exchange reservoir selection unit 133, the residual salt concentration decrease risk determination unit 131, and the stockpile water shortage risk determination unit 132 perform the process of selecting a water exchange reservoir for water exchange.

[0077] Next, the water management plan correction process (9) will be described. This process (9) is executed after the selection process (8) of the reservoir for water management. The water management plan correction unit 134 of the water management plan support device 101 corrects the water management plan so as to eliminate the water surplus or shortage by accommodating water (sending / receiving) from reservoir B selected in the above process (8) to reservoir A where the constraint violation (water surplus or shortage) has occurred. Figure 23 shows a flowchart of the process for correcting the water management plan.

[0078] In step 2301, the water management plan correction unit 134 calculates the amount of water to be transferred (time series) at each time so that water transfer from reservoir B to reservoir A is completed as early as possible and in the shortest time possible within the range permitted by the upper and lower water transfer volume limit constraints (maximum or minimum water transfer volume) as shown in Figures 4 and 6.

[0079] In step 2302, the water management plan correction unit 134 corrects the planned value for the pipeline flow rate of the shortest route from reservoir B to reservoir A by adding or subtracting the above-mentioned interchangeable amount (submission / acceptance amount) to the pipeline flow rate planned value so that the above-mentioned interchangeable amount reaches from reservoir B to reservoir A while maintaining the water balance relationship.

[0080] In step 2303, the water management plan correction unit 134 corrects the planned value for the water storage volume of Reservoir B by adding or subtracting the above-mentioned lending amount from the water storage volume plan value (subtracting if the water lending from Reservoir B is a transfer, and adding if it is an acceptance).

[0081] In step 2304, the water management plan correction unit 134 corrects the planned value for the water storage volume of reservoir A by adding or subtracting the above-mentioned lending amount from the water storage volume planned value (adding if the water lending from reservoir B is a transfer, and subtracting if it is an acceptance).

[0082] In step 2305, the water management plan correction unit 134 corrects the planned values ​​for the pipeline flow rates to each downstream distribution area that receives water from distribution reservoir A by adding the demand forecast error (time series, latest forecast value - original forecast value) for each water distribution area to each pipeline flow rate planned value (Figure 9).

[0083] Plan modifications are not required for pipeline flow rates and reservoir planned values ​​other than those mentioned above. Figures 24A and 24B show an example of a method for modifying a water management plan when a water shortage occurs in the reservoir 105 of a target water system and water is accommodated (sent) from the reservoir 106. Figure 24A is a diagram showing an example of a water management plan display screen when a water management plan modified from the original water management plan is presented. Figure 24B is a diagram showing an example of data from which the water management plan display screen shown in Figure 24A is output. In Figure 24A, when a water shortage occurs in the reservoir 105 and water is accommodated (sent) from the reservoir 106, the original water management plan is shown by a solid line, and the modified water management plan obtained by the above-mentioned simulation is shown by a dotted line. Also, in Figure 24B, it can be seen that the original water management plan, the results of the above-mentioned simulation, and the modified water management plan obtained by the simulation are associated with each other for each water distribution area and reservoir. The water management plan correction unit 134 then registers the corrected water management plan in the water management plan management table 147. In this manner, the water management plan correction unit 134 performs the water management plan correction process.

[0084] Next, the presentation process (10) of the revised water management plan will be described. This process (10) is executed after the water management plan revision process (9) has been carried out. The water management plan presentation unit 127 acquires the latest water demand forecast results for each of the water distribution areas 110-113 from the water demand forecast result management table 146, and also acquires the above-mentioned revised water management plan (planned values ​​such as the water supply volume of each water purification plant 103, 104, and the received water volume, stored water volume, and distributed water volume of each of the water distribution reservoirs 105-109) from the water management plan management table 147, creates the latest demand forecast and water management plan display screen that displays the above data in graphs, and displays it on the display unit 122.

[0085] The administrator of the water management plan support device 101 checks the demand forecast and water management plan display screens, and if he or she determines that there are no problems with the demand forecast results and the water management plan, inputs the execution of the water management plan from the input unit 121. The water management plan instruction unit 128 of the water management plan support device 101 transmits the latest water management plan to the monitoring and control system 114 via the network 115. The monitoring and control system 114 receives the water management plan, and operates equipment such as pumps and valves at each water purification plant and reservoir based on the water management plan. In this manner, the water management plan presentation unit 127 presents the revised water management plan.

[0086] As described above, according to an embodiment of the present invention, a water management plan support device having a processor and creating a water management plan for a water facility having a water purification plant and a plurality of distributing reservoirs includes a water management plan creation unit (e.g., water management plan unit 126) that creates a water management plan for the water facility based on a water demand forecast, a replanning determination unit (e.g., replanning determination unit 129) that calculates the amount of water surplus or shortage in a distributing reservoir where a constraint violation regarding the upper and lower storage limits occurs based on a predicted value of the water storage volume obtained by a water storage volume forecast simulation in each distributing reservoir and predetermined upper and lower storage volume limits (e.g., the upper and lower limits shown in Figures 12 and 13) and determines that replanning of the water management plan is necessary, and a water management unit (e.g., water management unit 130) that calculates the amount of water surplus or shortage in a distributing reservoir where a constraint violation regarding the upper and lower storage volume limits occurs based on the predicted value of the water storage volume obtained by a water storage volume forecast simulation in each distributing reservoir and predetermined upper and lower storage volume limits (e.g., the upper and lower limits shown in Figures 12 and 13) and determines that replanning of the water management plan is necessary, and The water supply system includes a reservoir selection unit (e.g., a water supply reservoir selection unit 133) that calculates the water supply capacity to the reservoir and selects the reservoir to which the water supply is to be transferred based on the residual salinity of each reservoir or the reservoir when the water supply is transferred to the reservoir from among the reservoirs that have a water supply capacity equal to or greater than the water surplus or shortage of the reservoir, and a water operation plan correction unit (e.g., a water operation plan correction unit 134) that corrects the planned value of the water operation plan of the water facility so that the excess or shortage of water in the reservoir is transferred from the selected reservoir. Even if a discrepancy occurs between the water operation plan and the actual results (violation of the reservoir's storage capacity constraint due to a water surplus or shortage), the water operation plan is corrected by transferring water between multiple reservoirs to eliminate the discrepancy. As a result, it becomes unnecessary to re-plan the water operation plan for the entire water system, and it becomes possible to re-plan the water operation plan with a limited scope of plan changes.

[0087] In addition, in a water operation plan, it is important to ensure a stable supply of water and to conserve energy in equipment such as pumps and valves. According to the embodiment of the present invention, it is possible to re-plan a water operation plan with a limited scope of plan changes, so that unnecessary equipment such as pumps and valves will not be operated, and power consumption can be reduced. As a result, while realizing a stable supply of water, it is possible to realize even greater energy conservation in the above-mentioned equipment compared to the past, reduce the environmental load, and contribute to the realization of a society that is friendly to the global environment. In addition, in recent years, there have been many sudden heavy rains due to the effects of global warming, and there is a tendency for unpredictable changes in precipitation to occur frequently, which can cause frequent changes in the water operation situation in water facilities such as water purification plants and water distribution reservoirs. According to the embodiment of the present invention, even if such unpredictable environmental changes related to water operation occur frequently, it is possible to re-plan the water operation plan without increasing the burden on operators to change operations.

[0088] Although the present invention has been described in detail above using the drawings, it is not limited to the above-mentioned various examples, and various modifications are possible within the scope of the present invention. For example, in the flowchart shown in FIG. 15, a process of calculating a risk of a decrease in the residual salinity concentration in the received water of each of the water reservoirs C of the water exchange candidate in step S1502, and a process of calculating a risk of a decrease in the residual salinity concentration in the received water of each of the water reservoirs C of the water exchange candidate in step 1503 are performed. However, for example, in a site of a certain degree of small scale such as a city or village, the distance from the water purification plant to the water reservoir and the distance between the water reservoirs are short, and even if each of the water reservoirs C of the water exchange candidate exchanges water with the water reservoir A, the change in the flow of the water sent from the water purification plant (increase in the flow arrival time) is unlikely to occur, and there are cases where it is not necessary to consider a decrease in the residual salinity concentration in the received water of the water reservoir.

[0089] In such a case, the selection of the reservoir for water transfer may be performed without performing the process of step S1502, on the premise that the increase in the flow arrival time does not increase to a certain degree (for example, the condition that the flow arrival time increases to or above a predetermined threshold value is not satisfied). In other words, the water management plan support device may be controlled so as not to select a reservoir based on the level of the residual salinity of the received water when the change in the flow of the water when the water transfer is performed from the selected reservoir to the reservoir where the constraint violation occurs does not satisfy the above-mentioned predetermined condition. In other words, it may be possible to select whether or not to perform the process of calculating the risk of a decrease in the residual salinity of the received water depending on the size of the site having water facilities such as a water purification plant and a water reservoir to which the system is applied. This makes it possible to provide a system that allows replanning of a water management plan with a limited scope of plan changes while taking into account the processing load according to the size of the business operator performing the water management. [Explanation of symbols]

[0090] 101...Water operation planning support device 102...Water supply system 103, 104…Water purification plant 105, 106, 107, 108, 109...Water reservoir 110, 111, 112, 113... Water distribution area 114…Monitoring and control systems 115…Network 121...Input section 122...Display section 123…Facility Information Registration Department 124…Measurement data acquisition section 125…Water Demand Forecasting Division 126…Water Operations and Planning Division 127…Water Management Plan Presentation Section 128…Water Operation Planning and Instruction Division 129…Replanning Judgment Section 130…Water accommodation adjustment surplus calculation unit 131…Residual salt concentration reduction risk assessment section 132…Water storage shortage risk calculation section 133…Water interchange distribution reservoir selection department 134…Water Management Plan Revision Section 141... Water purification plant information management table 142... Water reservoir information management table 143...Water distribution area information management table 144...Pipeline information management table 145...Measurement data management table 146...Water demand forecast result management table 147...Water operation plan management table

Claims

1. A water operation plan support device having a processor and creating a water operation plan for a water facility having a water purification plant and a plurality of water reservoirs, A water operation plan creation department that creates a water operation plan for water facilities based on the water demand forecast; a replanning determination unit that calculates the amount of water surplus or shortage in the water reservoir where a constraint violation regarding the upper and lower water storage limits occurs based on a predicted value of the water storage volume obtained by a water storage volume prediction simulation in each water reservoir and predetermined upper and lower water storage volume limits, and determines that a replanning of the water operation plan is necessary; a reservoir selection unit that calculates a water transfer capacity for each reservoir other than the reservoir by adjusting the amount of water received, and selects a reservoir to which water will be transferred from among the reservoirs having a water transfer capacity equal to or greater than the amount of water surplus or deficit of the reservoir, based on the residual salt concentration of the reservoir or the reservoir when water is transferred to the reservoir; a water operation plan correction unit that corrects a planned value of a water operation plan of the water facility so that water in an excess or shortage amount in the water reservoir is accommodated from the selected water reservoir; A water management plan support device comprising:

2. The reservoir selection unit selects a reservoir based on a residual salt concentration of the receiving water of the reservoir, the residual salt concentration changing with a change in the flow of the water when water is accommodated from the selected reservoir to the reservoir. The water management plan support device according to claim 1.

3. The water reservoir selection unit selects a water reservoir based on a residual salt concentration of the water stored in the selected water reservoir when water is accommodated from the selected water reservoir to the water reservoir. The water management plan support device according to claim 1.

4. The reservoir selection unit selects a reservoir based on a volume of water stored in the selected reservoir when water is transferred from the selected reservoir to the reservoir. The water management plan support device according to claim 1.

5. The water management plan support device does not select a reservoir based on the residual salt concentration of the receiving water when a change in the flow of water sent from the selected reservoir to the reservoir does not satisfy a predetermined condition. The water management plan support device according to claim 2.

6. A water operation planning support method in which a computer having a processor creates a water operation plan for a water facility having a water purification plant and a plurality of water reservoirs, comprising: The processor, Create water operation plans for water facilities based on water demand forecasts, Based on the predicted water storage volume obtained by the water storage volume prediction simulation in each water reservoir and the predetermined upper and lower water storage volume limits, the amount of water surplus or shortage in the water reservoir where a constraint on the upper and lower water storage volume limits is violated is calculated, and it is determined that a replanning of the water operation plan is necessary. For each of the reservoirs other than the reservoir, the water transfer capacity to the reservoir is calculated by adjusting the amount of water received, and a reservoir to which the water transfer is to be performed is selected from among the reservoirs having a water transfer capacity equal to or greater than the amount of water surplus or deficit of the reservoir, based on the residual salt concentration of the reservoir or the reservoir when the water transfer to the reservoir is performed; A planned value of a water operation plan of the water facility is corrected so that the excess or shortage of water in the water reservoir is accommodated from the selected water reservoir. A water management plan support method comprising:

7. The processor selects a distributing reservoir based on a residual salt concentration of the receiving water of the distributing reservoir, the residual salt concentration being changed with a change in the flow of the receiving water when water is accommodated from the selected distributing reservoir to the distributing reservoir. The water management plan support method according to claim 6 .

8. The processor selects a distributing reservoir based on a residual salt concentration of the water stored in the selected distributing reservoir when water is accommodated from the selected distributing reservoir to the distributing reservoir. The water management plan support method according to claim 6 .

9. The processor selects a distributing reservoir based on a volume of water stored in the selected distributing reservoir when water is accommodated from the selected distributing reservoir to the distributing reservoir. The water management plan support method according to claim 6 .

10. When a change in the flow of water when water is accommodated from the selected reservoir to the reservoir does not satisfy a predetermined condition, the processor does not select a reservoir based on the residual salt concentration of the receiving water. The water management plan support method according to claim 7.

11. A computer having a processor, A process for creating a water operation plan for a water treatment plant and a water facility having multiple distribution reservoirs based on a water demand forecast; A process of calculating the amount of water surplus or shortage in a water reservoir where a constraint violation regarding the upper and lower limits of water storage occurs based on a predicted value of the water storage volume obtained by a water storage volume prediction simulation in each water reservoir and predetermined upper and lower limits of water storage volume, and determining that a re-planning of the water operation plan is necessary; A process of calculating the water transfer capacity of each of the reservoirs other than the reservoir by adjusting the amount of water received, and selecting a reservoir to which the water transfer will be performed from among the reservoirs having a water transfer capacity equal to or greater than the amount of water surplus or deficit of the reservoir, based on the residual salt concentration of the reservoir or the reservoir when the water transfer is performed to the reservoir; A process of correcting a planned value of a water operation plan of the water facility so as to accommodate an excess or shortage of water in the water reservoir from the selected water reservoir; A water management plan support program characterized by executing the above.

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