Water quality control system, water quality control device, water quality control method, and water quality control program

Abstract

To provide a water quality management system capable of accurately predicting changes in water quality in a water area.SOLUTION: A water quality management system 1 includes an imaging device 10, a water quality database storage unit 332, an analysis unit 323, and a prediction unit 325. The imaging device 10 captures images of the water surface in a predetermined water body. The water quality database storage unit 332 stores a water quality database that stores information on the correlation between the flow velocity or flow direction and changes in water quality with respect to the water flow in the water body. The analysis unit 323 analyzes the imaging information captured by the imaging device 10 to calculate the velocity or direction of the water flow in the water body. The prediction unit 325 predicts the water quality in the water body after a predetermined period of time based on the information stored in the water quality database and the information calculated by the analysis unit 323.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water quality control system, a water quality control device, a water quality control method, and a water quality control program. [Background technology]

[0002] In order to properly maintain the natural environment or facility environment around water bodies such as rivers, it is necessary to monitor the water quality of the river. To monitor the water quality of the river, there is a technology in which river water quality measurement data is sent to a management server, and the management server analyzes the acquired measurement data and sends the analysis results to a user's terminal (for example, Patent Document 1).

[0003] Using this technology, users can monitor river water quality data and analysis results on their devices. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-250557 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a change in the water quality of a river is expected to occur, it may be possible to detect this at an early stage, predict the change in water quality, and take measures to maintain the natural environment or facility environment around the river in an appropriate manner. However, the above-mentioned technology has the problem of being unable to predict changes in river water quality in advance.

[0006] Therefore, an object of the present invention is to provide a water quality management system, a water quality management device, a water quality management method, and a water quality management program that are capable of accurately predicting changes in the water quality of a water area. [Means for solving the problem]

[0007] A water quality management system according to one embodiment of the present invention comprises an imaging device that photographs the water surface in a specified water area, a water quality database memory unit that stores a water quality database containing information regarding the correlation between the flow speed or direction of water flow in the water area and changes in water quality, an analysis unit that analyzes the imaging information captured by the imaging device and calculates the flow speed or direction of the water flow in the water area, and a prediction unit that predicts the water quality in the water area after a specified time has passed based on the information stored in the water quality database and the information calculated by the analysis unit.

[0008] Furthermore, a water quality control device according to one embodiment of the present invention is communicatively connected to an imaging device that photographs the water surface within a specified water area, and includes a water quality database storage unit that stores a water quality database containing information regarding the correlation between the flow speed or direction of the water flow within the water area and changes in water quality, an analysis unit that analyzes the imaging information captured by the imaging device and calculates the flow speed or direction of the water flow within the water area, and a prediction unit that predicts the water quality within the water area after a specified time has elapsed based on the information stored in the water quality database and the information calculated by the analysis unit.

[0009] In another aspect of the present invention, a water quality management method is provided in which a water quality management device is communicatively connected to an imaging device that images the water surface in a specified water area, and has a water quality database memory unit that stores a water quality database containing information regarding the correlation between the flow speed or direction of the water flow in the water area and changes in water quality, analyzes the imaging information captured by the imaging device, calculates the flow speed or direction of the water flow in the water area, and predicts the water quality in the water area after a specified time has passed based on the information stored in the water quality database and the calculated flow speed or direction of the water flow in the water area.

[0010] In addition, a water quality management program according to one embodiment of the present invention provides a water quality management device that is communicatively connected to an imaging device that images the water surface in a specified water area and has a water quality database memory unit that stores a water quality database containing information regarding the correlation between the flow speed or direction of the water flow in the water area and changes in water quality, and that analyzes the imaging information captured by the imaging device to calculate the flow speed or direction of the water flow in the water area, and a function of predicting the water quality in the water area after a specified time has passed based on the information stored in the water quality database and the calculated flow speed or direction of the water flow in the water area. Effect of the Invention

[0011] According to the present invention, it is possible to provide a water quality management system, a water quality management device, a water quality management method, and a water quality management program that are capable of accurately predicting changes in the water quality of a water area. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a configuration of a water quality control system according to an embodiment. [Diagram 2] 1 is a flowchart showing a water quality database generation process executed by a water quality control device according to an embodiment. [Diagram 3] 4 is a flowchart showing a water quality management process executed by a water quality management device according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An exemplary embodiment of the water quality control system will be described below with reference to the drawings. In this embodiment, the water quality control system predicts the water quality in a predetermined water area WA of a river R after a predetermined time has elapsed.

[0014] <Configuration of a water quality control system according to one embodiment> Fig. 1 is a block diagram showing the configuration of a water quality control system 1 according to this embodiment. The water quality control system 1 includes a plurality of imaging devices 10-1 to 10-4 and water quality sensors 20-1 to 20-4 installed on the riverbank around a predetermined water area WA of a river R, a water quality control device 30, and a plurality of user terminals 40-1 to 40-n. In Fig. 1, a case has been described in which four imaging devices and four water quality sensors are installed on the riverbank of the river R, but the number is not limited to this and may be one to three, or five or more.

[0015] The imaging devices 10-1 to 10-4 are configured to be capable of wireless communication with the water quality control device 30. The imaging devices 10-1 to 10-4 capture images of predetermined areas AR1 to AR4 within the water area WA, respectively, and transmit the captured imaging information to the water quality control device 30 by wireless.

[0016] The water quality sensors 20-1 to 20-4 are configured to be able to wirelessly communicate with the water quality management device 30. The water quality sensors 20-1 to 20-4 each acquire information indicating the water quality of the surface water of the river R at predetermined positions P1 to P4 in the water area WA, specifically, in the water within a predetermined distance from the water surface, and wirelessly transmit the acquired information to the water quality management device 30.

[0017] Position P1 is a position corresponding to region AR1, for example, a position within region AR1 or within a predetermined distance from region AR1. Similarly, position P2 is a position corresponding to region AR2, position P3 is a position corresponding to region AR3, and position P4 is a position corresponding to region AR4.

[0018] The information indicating the water quality acquired by the water quality sensors 20-1 to 20-4 varies depending on the purpose, but may be, for example, measurement values ​​of water quality indicators such as hydrogen ion concentration (pH), turbidity, water temperature, dissolved oxygen, oxidation-reduction potential, or salinity in the water.

[0019] The imaging devices 10-1 to 10-4 and the corresponding water quality sensors 20-1 to 20-4 may be configured as an integrated unit.

[0020] Hereinafter, when it is not specified which of the imaging devices 10-1 to 10-4 it is, it will be referred to as imaging device 10. Similarly, when it is not specified which of the water quality sensors 20-1 to 20-4 it is, it will be referred to as water quality sensor 20. Similarly, when it is not specified which of the areas AR1 to AR4 it is, it will be referred to as area AR. Similarly, when it is not specified which of the positions P1 to P4 it is, it will be referred to as position P.

[0021] The water quality control device 30 has a first communication unit 31, a CPU 32, a storage unit 33, and a second communication unit 34. The first communication unit 31 performs wireless communication with the imaging devices 10-1 to 10-4 and the water quality sensors 20-1 to 20-4.

[0022] The CPU 32 is, for example, a CPU (Central Processing Unit) provided in a general-purpose microcomputer, and constitutes one or more information processing units described below by installing and executing a predetermined water quality management program. The CPU 32 has an imaging information acquisition unit 321, a measurement information acquisition unit 322, an analysis unit 323, a database generation unit 324, a prediction unit 325, and a weather data acquisition unit 326.

[0023] The imaging information acquisition section 321 acquires imaging information captured by the imaging device 10 via the first communication section 31, and stores the acquired imaging information in the storage section 33, which will be described later.

[0024] The measurement information acquisition unit 322 acquires the information measured by the water quality sensor 20 via the first communication unit 31.

[0025] The analysis unit 323 analyzes the imaging information captured by the imaging device 10, and calculates the flow speed and flow direction of the water current within the captured area AR.

[0026] When the database generation unit 324 detects a change in water quality at any of the locations P based on the information acquired by the measurement information acquisition unit 322, it acquires from the memory unit 33 the imaging information of the area AR corresponding to the location P that was photographed during the period from the time of detection to a predetermined time ago.

[0027] The database generation unit 324 sends the acquired imaging information to the analysis unit 323 to calculate the flow velocity and flow direction of the water current for each predetermined time in this area AR. The database generation unit 324 generates a water quality database based on the flow velocity and flow direction calculated by the analysis unit 323 and information on the detected change in water quality, and stores the database in the storage unit 33.

[0028] The prediction unit 325 predicts the water quality in the water area WA after a predetermined time has elapsed based on the information stored in the water quality database and the information calculated by the analysis unit 323. The weather data acquisition unit 326 acquires weather data related to the location of the water area WA.

[0029] The storage unit 33 has an imaging information storage unit 331 and a water quality database storage unit 332. The imaging information storage unit 331 stores the imaging information acquired by the imaging information acquisition unit 321. The water quality database storage unit 332 stores the water quality database generated by the database generation unit 324.

[0030] The second communication unit 34 performs wireless communication with the user terminals 40-1 to 40-n.

[0031] <Operation of the Water Quality Control System According to an Embodiment> The following describes (1) water quality database generation processing and (2) water quality management processing executed by the water quality management system 1 according to this embodiment.

[0032] (1) Water quality database generation process When the water quality database generation process starts, each imaging device 10 captures a video of the water surface in each area AR, adds the position information of its own imaging device 10 to the captured imaging information, and wirelessly transmits it to the water quality management device 30. Also, each water quality sensor 20 acquires information indicating the water quality of the surface layer of the river R at each position P at a predetermined time interval, for example, at 10-minute intervals, and transmits the acquired information to the water quality management device 30 with the position information of its own water quality sensor 20 added.

[0033] Here, each imaging device 10 may add the identification information of its own imaging device 10 to the captured imaging information and wirelessly transmit it to the water quality management device 30. Similarly, each water quality sensor 20 may add the identification information of its own water quality sensor 20 to the acquired information and wirelessly transmit it to the water quality management device 30. In this case, the water quality management device 30 stores in advance correspondence information between the identification information and position information of each imaging device 10 and between the identification information and position information of each water quality sensor 20, identifies the position information of this imaging device 10 based on this stored correspondence information and the identification information acquired from the imaging device 10, and identifies the position information of this water quality sensor 20 based on the stored correspondence information and the identification information acquired from the water quality sensor 20.

[0034] In the water quality control device 30, the first communication unit 31 receives the imaging information transmitted from each imaging device 10 and sends it to the imaging information acquisition unit 321. The imaging information acquisition unit 321 stores the acquired imaging information in the imaging information storage unit 331 in sequence.

[0035] In the water quality control device 30, the first communication unit 31 receives information indicating the water quality transmitted from each water quality sensor 20 and sends it to the measurement information acquisition unit 322. The measurement information acquisition unit 322 sends the acquired information indicating the water quality to the database generation unit 324.

[0036] FIG. 2 is a flowchart showing the water quality database generation process executed by the water quality control device 30.

[0037] Each time the database generating unit 324 of the water quality management device 30 acquires information indicating the water quality from the measurement information acquiring unit 322, it determines whether the water quality at the position P corresponding to the acquired information has changed. For example, when at least one of the measurement values ​​of the hydrogen ion concentration, turbidity, and salinity concentration in the water acquired as information indicating the water quality falls outside a predetermined appropriate range, the database generating unit 324 detects that the water quality at the position P corresponding to the acquired information has changed. Here, an example will be described in which the database generating unit 324 detects that the salinity concentration at the position P1 has changed based on the information acquired from the water quality sensor 20-1.

[0038] When the database generation unit 324 detects that the salinity concentration has changed based on the information indicating the water quality acquired by the water quality sensor 20-1 ("YES" in S1), it acquires from the memory unit 33 the imaging information of the area AR1 corresponding to the position P1 that was captured a predetermined time prior to the time of detection, for example up to 30 minutes prior (S2).

[0039] The database generating unit 324 sends the acquired imaging information to the analyzing unit 323 to calculate the flow velocity and flow direction of the water current in the area AR1 for each predetermined time, for example, for each minute (S3). When the flow velocity or flow direction of the water current in the area AR1 calculated by the analyzing unit 323 has changed by a predetermined value or more compared to normal times, the database generating unit 324 acquires time information at which this change occurred.

[0040] The database generator 324 generates information showing a correlation between information on the detected change in water quality and information on the change in flow velocity or flow direction, including the time when the change in flow velocity or flow direction of the water flow in the area AR1 occurred. Examples (i) and (ii) of information generated by the database generator 324 are given below.

[0041] (i) When the database generation unit 324 recognizes that the measured value of the salinity concentration in the water at position P1 becomes higher than the appropriate range, and that the direction of the water flow in area AR1 has changed to the opposite direction from normal 15 minutes prior to that, the database generation unit 324 generates information indicating the correlation between the direction of the water flow in area AR1 and information regarding changes in water quality over time thereafter, such as "when the direction of the water flow in area AR1 changes to the opposite direction from normal, approximately 15 minutes later, the salinity concentration in the water at position P1 will become higher than the appropriate range."

[0042] (ii) When the database generation unit 324 recognizes that the turbidity of the water at position P2 becomes higher than the appropriate range and that the flow rate of the water in area AR2 became faster than a predetermined value 25 minutes prior to that, it generates information indicating the correlation between the flow rate of the water in area AR2 and information related to the subsequent change in water quality over time, such as "when the flow rate of the water in area AR2 becomes equal to or greater than a predetermined value, the turbidity will become higher than the appropriate range approximately 25 minutes later."

[0043] The database generation unit 324 generates a water quality database that stores the generated information (S4). Thereafter, the database generation unit 324 repeats the processes of steps S1 to S4, and each time a change in water quality is detected, the database generation unit 324 generates information indicating the correlation between the flow speed and direction of the water current in the area AR and information related to the detected change in water quality, and updates the water quality database.

[0044] (2) Water quality control and treatment When the water quality management process starts, each imaging device 10 captures a video of the water surface in each area AR, adds position information of the imaging device 10 to the captured imaging information, and wirelessly transmits the captured imaging information to the water quality management device 30. Each imaging device 10 captures a video for 10 seconds at 10-minute intervals, for example, and wirelessly transmits the imaging information to the water quality management device 30.

[0045] Here, similarly to the case described in (1) Water quality database generation process, each imaging device 10 may add the identification information of its own imaging device 10 to the captured imaging information and wirelessly transmit it to the water quality management device 30. Similarly, each water quality sensor 20 may add the identification information of its own water quality sensor 20 to the acquired information and wirelessly transmit it to the water quality management device 30.

[0046] 3 is a flowchart showing the water quality management process executed by the water quality management device 30. In the water quality management device 30, when imaging information is transmitted from each imaging device 10, the first communication unit 31 acquires this imaging information ("YES" in S11) and sends it to the imaging information acquisition unit 321. The imaging information acquisition unit 321 sends the acquired imaging information to the analysis unit 323.

[0047] The analysis unit 323 analyzes the acquired imaging information and calculates the flow speed and flow direction of the water current in the captured area AR (S12). For example, if the acquired imaging information, which is a video, is captured at a frame rate of 30 fps, the analysis unit 323 calculates the flow speed and flow direction of the water current in the area AR by taking the difference between adjacent frames from 300 frames of imaging information for 10 seconds.

[0048] When the prediction unit 325 detects that there is an area AR in which the flow velocity or flow direction calculated by the analysis unit 323 has changed by more than a predetermined value from normal times ("YES" in S13), it determines whether information regarding the change in the water flow velocity or flow direction of this area AR is stored in the water quality database (S14).

[0049] When the prediction unit 325 determines that information regarding changes in the flow velocity or direction of the water current in this area AR is stored in the water quality database ("YES" in S14), it predicts the water quality in the water within the area AR after a predetermined time has passed based on the information stored in the water quality database and the information calculated by the analysis unit 323.

[0050] For example, when the prediction unit 325 detects that the water flow direction in the area AR1 has changed to the opposite direction from normal, the prediction unit 325 recognizes that the above-mentioned information (i) is stored in the water quality database as information corresponding to this. Based on the information stored in the water quality database and the information calculated by the analysis unit 323, the prediction unit 325 predicts that the salinity concentration in the water at the position P1 will be higher than the appropriate range about 15 minutes after the change in the water flow direction is detected.

[0051] The prediction unit 325 generates prediction information including the prediction content and transmits it to the user terminals 40-1 to 40-n via the second communication unit 34 (S15). The user terminals 40-1 to 40-n each output the prediction information acquired from the water quality control device 30. By recognizing the prediction information output from the user terminals 40-1 to 40-n, each user can take measures such as closing a predetermined number of water gates installed in the river to maintain an appropriate environment in the river.

[0052] Here, the water quality management device 30 may generate countermeasures against changes in water quality based on information previously stored therein, and transmit the countermeasures to the user terminals 40-1 to 40-n. For example, a water gate downstream of a position P where the salinity is predicted to increase may be identified, and a countermeasure to close the water gate to prevent backflow of seawater from the ocean may be generated and transmitted to the user terminals 40-1 to 40-n.

[0053] In the above-described embodiment, the water quality database may store information on the correlation between the water flow in the water area WA, taking into account the change in water quality over time of deep water in addition to the change in water quality over time of surface water, in addition to the flow speed and flow direction. For the change in water quality of the deep water, for example, values ​​measured in the past may be used.

[0054] This enables the prediction unit 325 to predict the state of deep water in a water area and to predict with even greater accuracy the change in water quality after a predetermined time has passed.

[0055] In addition, in the above-mentioned embodiment, the water quality database may store information regarding the water flow within the water area WA, including the flow speed and direction, and changes in water quality over time within a specified distance from the water surface, as well as information regarding correlations that take into account meteorological data.

[0056] This allows the prediction unit 325 to predict the water quality in the water area WA after a predetermined time has elapsed based on the information stored in the water quality database, the information calculated by the analysis unit 323, and the weather data acquired by the weather data acquisition unit 326. Examples of weather data include tide level, wind speed, rainfall, water temperature, etc.

[0057] [Effects of the embodiment] As described above in detail, the water quality management system according to this embodiment includes an imaging device, a water quality database storage unit, an analysis unit, and a prediction unit. The imaging device captures an image of the water surface in a specified water area. The water quality database storage unit stores a water quality database that stores information regarding the correlation between the flow speed or flow direction of the water flow in the water area and changes in water quality. The analysis unit analyzes the imaging information captured by the imaging device and calculates the flow speed or flow direction of the water flow in the water area. The prediction unit predicts the water quality in the water area after a specified time has passed based on the information stored in the water quality database and the information calculated by the analysis unit.

[0058] This enables the water quality control system to accurately predict changes in water quality after a specified time has passed from changes in the flow velocity or direction of the water body.

[0059] In addition, the water quality database memory unit stores a water quality database that contains information regarding the correlation between the flow speed and direction of water flow within the water body and changes in at least one of the hydrogen ion concentration, turbidity, or salinity concentration in the water, which indicate the water quality, and the prediction unit may predict the hydrogen ion concentration, turbidity, or salinity in the water within the water body after a predetermined time has passed based on the information stored in the water quality database and information calculated by the analysis unit.

[0060] This makes it possible to accurately predict changes in river water quality, such as changes in hydrogen ion concentration due to the growth of aquatic plants, changes in turbidity due to rainfall, and changes in salinity due to backflow from the sea.

[0061] The water quality management device according to this embodiment is communicatively connected to an imaging device that captures images of the water surface in a specified water area, and includes a water quality database storage unit, an analysis unit, and a prediction unit. The water quality database storage unit stores a water quality database that stores information regarding the correlation between the flow speed or flow direction of the water flow in the water area and changes in water quality. The analysis unit analyzes the imaging information captured by the imaging device and calculates the flow speed or flow direction of the water flow in the water area. The prediction unit predicts the water quality in the water area after a specified time has passed, based on the information stored in the water quality database and the information calculated by the analysis unit.

[0062] This enables the water quality control device to accurately predict changes in water quality after a specified time has passed from changes in the flow velocity or direction of the water body.

[0063] The water quality management device may further include an imaging information storage unit, a water quality sensor, and a database generation unit. The imaging information storage unit stores imaging information captured by the imaging device. The water quality sensor acquires information indicating the water quality in the water area. When the database generation unit detects a change in water quality based on the information acquired by the water quality sensor, it acquires imaging information from the imaging information storage unit for a period from the time of detection to a predetermined time ago, sends it to an analysis unit to calculate the flow speed or flow direction of the water flow in the water area for each predetermined time, and generates a water quality database based on the flow speed or flow direction calculated by the analysis unit and information related to the detected change in water quality, and stores it in the water quality database storage unit.

[0064] This makes it possible to generate a highly accurate water quality database based on imaging information obtained by actually photographing the water surface and actual measurements of water quality taken by the water quality sensor.

[0065] In addition, the water quality sensor may acquire measured values ​​of at least one of the hydrogen ion concentration, turbidity, or salinity concentration in the water as information indicating the water quality, and the database generation unit may detect that the water quality has changed when at least one of the measured values ​​of the hydrogen ion concentration, turbidity, or salinity in the water measured by the water quality sensor falls outside a predetermined appropriate range.

[0066] This makes it possible to accurately detect changes in river water quality based on changes in hydrogen ion concentration due to the growth of aquatic plants, changes in turbidity due to rainfall, changes in salinity due to backflow from the sea, etc.

[0067] The water quality database may also store information regarding the correlation between the flow speed or direction of water currents within a body of water and changes in the quality of surface water and changes in the quality of deep water.

[0068] This enables the prediction unit to predict the deep water conditions in the body of water, while also predicting changes in water quality after a predetermined period of time has passed with even greater accuracy.

[0069] In addition, the water quality management device may further include a weather data acquisition unit that acquires weather data related to the location of the water body, and the water quality database may store information regarding the correlation between the flow rate or direction of water flow within the water body, changes in water quality, and weather data, and the prediction unit may predict the water quality within the water body after a predetermined time has passed based on the information stored in the water quality database, the information calculated by the analysis unit, and the weather data acquired by the weather data acquisition unit.

[0070] This enables the prediction unit to take into account meteorological data such as tide levels, wind speed, rainfall, and water temperature, enabling it to predict changes in water quality after a specified period of time has passed with even greater accuracy.

[0071] The water quality management method according to the present embodiment relates to a water quality management device that is communicatively connected to an imaging device that captures images of the water surface in a specified water area, and that includes a water quality database storage unit that stores a water quality database that contains information regarding the correlation between the flow speed or flow direction of the water flow in the water area and changes in water quality. The water quality management device analyzes the imaging information captured by the imaging device, calculates the flow speed or flow direction of the water flow in the water area, and predicts the water quality in the water area after a predetermined time has passed based on the information stored in the water quality database and the calculated flow speed or flow direction of the water flow in the water area.

[0072] This enables the water quality control device to accurately predict changes in water quality after a predetermined time has passed from changes in the flow velocity or direction of the water body.

[0073] The water quality management program according to this embodiment is communicatively connected to an imaging device that captures images of the water surface in a specified water area, and has a water quality database memory unit that stores a water quality database containing information regarding the correlation between the flow speed or direction of water currents in the water area and changes in water quality. The water quality management program provides the following functions to the water quality management device: analyzes the imaging information captured by the imaging device to calculate the flow speed or direction of the water current in the water area; and predicts the water quality in the water area after a specified time has passed based on the information stored in the water quality database and the calculated flow speed or direction of the water current in the water area.

[0074] This allows the water quality control device to accurately predict changes in water quality after a specified time has passed from changes in the flow velocity or direction of the water body.

[0075] Although some embodiments have been described, the embodiments can be modified or modified based on the above disclosure. All components of the above embodiments and all features described in the claims may be individually extracted and combined as long as they are not mutually inconsistent. [Explanation of symbols]

[0076] 1. Water Quality Management System 10, 10-1 to 10-4 Imaging device 20, 20-1~20-4 Water quality sensor 30 Water quality control equipment 31 First Communications Department 32 CPU 33 Storage section 34 2nd Communications Department 40-1~40-n User terminal 321 Imaging information acquisition unit 322 Measurement information acquisition unit 323 Analysis Department 324 Database Generation Department 325 Prediction Department 326 Weather Data Acquisition Unit 331 Imaging information storage unit 332 Water Quality Database Storage Unit

Claims

1. An imaging device for photographing the water surface in a predetermined water area; A water quality database storage unit that stores a water quality database that stores information regarding the correlation between the flow speed or flow direction and the change in water quality regarding the water flow in the water area; An analysis unit that analyzes the imaging information captured by the imaging device and calculates a flow velocity or a flow direction of the water current in the water area; A water quality management system comprising: a prediction unit that predicts the water quality in the water area after a predetermined time has passed based on the information stored in the water quality database and the information calculated by the analysis unit.

2. the water quality database storage unit stores a water quality database that stores information regarding a correlation between a flow velocity or a flow direction of a water flow in the water area and at least one change in a hydrogen ion concentration, a turbidity, a water temperature, dissolved oxygen, an oxidation-reduction potential, or a salinity concentration in the water, which are water quality indices indicating water quality; The water quality control system according to claim 1 , wherein the prediction unit predicts the water quality index in the water area after a predetermined time has elapsed based on the information stored in the water quality database and the information calculated by the analysis unit.

3. A communication device is connected to an imaging device that captures an image of the water surface in a specified water area, A water quality database storage unit that stores a water quality database that stores information regarding the correlation between the flow speed or flow direction and the change in water quality regarding the water flow in the water area; An analysis unit that analyzes the imaging information captured by the imaging device and calculates the flow speed or flow direction of the water current in the water area; A water quality management device comprising: a prediction unit that predicts the water quality in the water area after a predetermined time has passed based on the information stored in the water quality database and the information calculated by the analysis unit.

4. an imaging information storage unit that stores imaging information captured by the imaging device; a water quality sensor for acquiring information indicating the water quality in the water area; The water quality management device of claim 3 further comprises a database generation unit which, when it detects a change in water quality based on the information acquired by the water quality sensor, acquires imaging information for the period from the time of detection to a predetermined time prior from the imaging information storage unit, sends it to the analysis unit to calculate the flow speed or direction of the water flow in the water area for each predetermined time, and generates the water quality database based on the flow speed or direction calculated by the analysis unit and information regarding the detected change in water quality and stores it in the water quality database storage unit.

5. The water quality sensor acquires a measurement value related to a water quality index indicating the water quality, 5. The water quality control device according to claim 4, wherein the database generating unit detects that the water quality has changed when a measurement value relating to a water quality index measured by the water quality sensor falls outside a predetermined appropriate range.

6. The water quality management device according to claim 3 , wherein the water quality database stores information regarding the correlation between the flow speed or flow direction of the water flow in the water area, and changes in the water quality of surface water and changes in the water quality of deep water.

7. A meteorological data acquisition unit that acquires meteorological data relating to the location of the water body, The water quality database stores information regarding the correlation between the flow rate or direction of the water flow in the water area, changes in water quality, and meteorological data; The water quality management device of claim 3, wherein the prediction unit predicts the water quality in the water area after a predetermined time has elapsed based on information stored in the water quality database, information calculated by the analysis unit, and weather data acquired by the weather data acquisition unit.

8. A communication device is connected to an imaging device that captures an image of the water surface in a specified water area, A water quality management device including a water quality database storage unit that stores a water quality database that stores information regarding the correlation between a flow velocity or flow direction and a change in water quality with respect to a water flow in the water area, Analyzing the imaging information captured by the imaging device to calculate the flow speed or flow direction of the water current in the water area; A water quality management method for predicting the water quality in the water area after a predetermined time has elapsed based on the information stored in the water quality database and the calculated flow velocity or flow direction of the water current in the water area.

9. A communication device is connected to an imaging device that captures an image of the water surface in a specified water area, A water quality management device including a water quality database storage unit that stores a water quality database that stores information regarding the correlation between the flow speed or flow direction and the change in water quality with respect to the water flow in the water area, A function of analyzing image information captured by the imaging device and calculating a flow velocity or a flow direction of a water current in the water area; A water quality management program for realizing a function of predicting the water quality within the water area after a specified time has elapsed based on the information stored in the water quality database and the calculated flow velocity or direction of the water flow within the water area.

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