KR20040083979A - System and method for managing the fresh lake using gis - Google Patents

Abstract

PURPOSE: A system and a method for managing a freshwater lake using the GIS(Geographic Information System) are provided to contribute to systematic arrangement/management/maintenance of the pollution source data for managing a quality of agricultural water related to the freshwater lake management by setting up a GIS based modeling supporting system for managing the freshwater lake. CONSTITUTION: A data I/O(Input/Output) part(15) inputs/outputs the data for environmental information search, and an estimated result for floodgates and water pollution to the user computer(5) through the GUI(Graphic User Interface)(10). A GIS database(45) includes a geometry database(45a) and an attribute database(45b). An environmental information search module(25) provides environmental information for a selected region from the GIS database. A pollution source management module(30) calculates pollutant/runoff loading from the pollution source status data of the attribute data for the selected region. A water modeling module(35) performs water modeling from the pollutant/runoff loading. A floodgate modeling module(40) models floodgate estimation for estimating pollution diffusion.

Description

Freshwater lake management system and method using GIS {SYSTEM AND METHOD FOR MANAGING THE FRESH LAKE USING GIS}

The present invention relates to a freshwater lake management system and method using GIS to predict water pollution through hydrologic modeling and water quality modeling from GIS-based pollution source information.

In general, GIS (Geographic Information System) refers to location information on various natural objects (mountains, rivers, land, etc.) and artificial objects (buildings, roads, railroads, etc.) existing on the surface, underground, and ground space. It is a high-tech information system that can input various information into a computer and connect it to efficiently support various planning, decision making and industrial activities. It is a spatial analysis system that evaluates and simulates conditions such as distance, area, and location as well as outputting various statistical data to support optimal decision making.

The existing GIS-based modeling method for managing freshwater lakes using the GIS has recently been attempted to link water quality and hydrological models using GIS in Korea. A management system has been developed. Overseas, the latest BASINS (Better Assessment Science Integrated Point and Nonpoint Source) model is used to manage point and nonpoint sources.

In Korea, the Agricultural Water Quality Management System of Korea Agricultural Infrastructure Corporation implemented water quality survey and repair survey for efficient and systematic water quality management of agricultural water and implemented the linkage between QUAL2E and WASP5 using ArcView, GIS software.

Detailed features of the Integrated Water Quality Information Management System for Agricultural Water are linked to the source database and the water quality model, and the quality of the water quality modeling in the inquiry, modification, and retrieval of the source database to support decision-making such as alternative pollutant treatment systems suitable for watershed characteristics. Supporting overall source reduction scenarios, such as treatment options, is available.

The BASINS model was developed by the Environmental Protection Agency (EPA) in 1999 by combining AreView, a GIS software, and a water quality model for integrated management of point sources and nonpoint sources. This program evaluates the quality of river water using QUAL2E and TOXIROUTE models, and the quality of rivers and lakes from non-point sources from watersheds using the Non Point Source Model (NPSM) model. Table 1 shows the existing developed technologies.

Agricultural Water Quality Information Management System BASINS producer Agricultural Infrastructure Corporation US Environmental Protection Agency Advantages Comprehensive management function of environmental data GIS-based convenient development environment Estimation and inquiry of pollutant load Function Modeling system support for water quality prediction Decision support function for alternative water quality improvement Integrated water system management of point and nonpoint source Provide point and nonpoint point modeling for water quality prediction Convenient modeling environment using GIS Disadvantages Applicable model suitable for domestic watershed environment. User's convenience is not considered as DOS based modeling environment. System safety is insufficient due to DDE communication. Difficult to apply to domestic watersheds Difficulty in implementing non-professional modeling Insufficient support for application development No error handling function Insufficient safety of system through DDE communication GIS S / W ArcVeiw (ESRI) ArcVeiw (ESRI) Hydrologic Model Kajiyama According to the characteristics of the model used River model QUAL2E QUAL2E Appeal Model WASP5 NPSM Data transmission system DDE DDE

However, in the case of the agricultural water quality information management system, a model suitable for the domestic watershed environment was not applied, and the BASINS model was developed for all regions of the United States to analyze water quality data and predict water quality of the watershed. Although used, it is designed for large watersheds. For this reason, it is difficult to systematically manage the watershed by predicting accurate water quality when applied to the domestic watershed environment.

Therefore, the technical problem to be achieved by the present invention is a source database search system, a water quality modeling support system for freshwater lake water quality management using MapObjects, a GIS component technology for accurate prediction of freshwater lake water pollution, a hydrological modeling support system suitable for watershed characteristics, The present invention provides a freshwater lake management system and method using GS that includes a linkage system of hydrologic and water quality models.

Another technical problem to be achieved by the present invention is to provide a freshwater lake management system and method using GIS to fully integrate the GIS and water quality prediction model for systematic and efficient water quality management of freshwater lakes.

Another technical problem to be achieved by the present invention is a freshwater lake management system and method using GS to support systematic modeling for water quality improvement by securing reliability in water quality prediction through the application of hydrologic and water quality models suitable for the watershed environment in Korea. To provide.

1 is a block diagram of a freshwater lake management system using the GS according to the present invention

2 is a flowchart illustrating a method for retrieving environmental information among freshwater lake management methods using GIS according to the present invention.

Figure 3 is a flow chart for explaining a method for calculating the pollution and delivery load in freshwater lake management method using the GS according to the present invention

Figure 4 is a flow chart for explaining the hydrologic prediction modeling method of freshwater lake management method using the GS according to the present invention

Figure 5 is a flow chart for explaining the water quality prediction modeling method of freshwater lake management method using the GS according to the present invention

6 is an exemplary view of a water quality prediction screen modeled by the freshwater lake management method using the GS according to the present invention

<Description of the symbols for the main parts of the drawings>

5: computer 10: GUI

15: data input and output unit 20: control unit

25: Environmental Information Search Module 30: Pollution Source Management Module

35: water quality modeling module 40: water quality modeling module

45: GIS-DB 50: Shape DB

55: attribute DB

The freshwater lake management system using GIS to achieve the technical problem, in the system for managing the water quality of freshwater lakes based on the GIS database on which information on the local environment is built, an interface for providing a graphical screen to the user computer Providing GUI; A data input / output unit for inputting / outputting data on environmental information retrieval, hydrological and water pollution prediction results to the user computer through a GUI; A GIS database storing GIS-based geographic figure data and storing environment attribute data related to the geographic figure data; An environment information retrieval module, which is a program for providing environment information on a region selected by a user from figure data and attribute data stored in the GIS database; A pollution source management module, which is a program for calculating pollution and delivery loads from pollution source status data of attribute data of a region selected from the environmental information retrieval module; A water quality modeling module, which is a program for modeling water quality from the pollution and the amount of suspended loads extracted from the pollution source management module; A hydrological modeling module, which is a program for modeling hydrologic prediction for pollution diffusion prediction from data about watershed inflow, watershed required quantity, and watershed water balance extracted from attribute data of the GIS database; And a control unit controlling all the configurations to output the environmental information search, the hydrological and the water quality prediction results requested by the user to the user computer.

In the present invention, the GIS database is a figure database for storing geographic figure data on the topographic map, river map, subwatershed, soil map, administrative area map for freshwater lake management; And an attribute database for storing data on point pollution source, land use status, water supply status, environmental foundation status, river water quality status, and the like for each figure data stored in the figure database.

In the present invention, it is preferable that the attribute database further includes total watershed data, subwatershed data, weather data, tap water inflow data, tap water flow rate distribution data, measured flow data, runoff data, and water intake data of a region selected by a user. Do.

On the other hand, the freshwater lake management method using the GS to achieve the technical problem, in the method of managing the water quality of the freshwater lake based on the GIS database on which the information on the local environment is built, (a1) the user's own desired area Receiving a selection of an environmental information search for; (a2) controlling, by the controller, the environment information retrieval module to search the figure database of the GIS database to read figure data of the selected region; (a3) a control unit transmitting figure data read by the environment information retrieval module to a user computer through a data input / output unit and a GUI to display on a screen; (a4) determining, by the controller, whether the selection of the attribution information search for the selected area is received from the user computer; (a5) if the user selects the attribute information search in the step (a4), the control unit controls the environment information search module to read attribute data of the selected region from the attribute database of the GIS database; And (a6) transmitting, by the control unit, the attribute data read by the environment information retrieval module to the user computer through the data input / output unit and the GUI to display on the screen.

In addition, the freshwater lake management method using the GS to achieve the above technical problem, in the method of managing the water quality of freshwater lakes based on the GIS database on which information on the local environment is built, (b1) the user wants to predict the hydrological Receiving a selection of a region; (b2) The control unit controls the hydrologic modeling module to convert the total watershed data, subwatershed data, meteorological data, water inflow data, water inflow distribution data, and measured outflow data into the GIS database. Reading from a database; (b3) receiving the data read by the hydrological modeling module and modeling the hydrological surface through a predetermined operation; And (b4) displaying the hydrologic prediction data modeled by the hydrologic modeling module under the control of the controller on the user computer through the data input / output unit and the GUI.

In addition, the freshwater lake management method using the GS to achieve the above technical problem, in the method of managing the water quality of the freshwater lake based on the GIS database on which information on the local environment is built, (c1) the user wants to predict the water quality Receiving a selection of a region; (c2) The control unit controls the water quality modeling module so that the inflow concentration data, the inflow concentration data, the inflow concentration data among the inflow concentration data, the outflow data, and the intake volume data for the water quality prediction of the area selected by the user, the outflow volume from the pollution control module, and the intake data are the attributes of the GIS database. Reading from a database; (c3) receiving water read by the water quality modeling module and modeling water quality through a predetermined operation; And (c4) displaying the water quality prediction data modeled by the water quality modeling module on the user computer through the data input / output unit and the GUI under the control of the controller.

In the present invention, the inflow concentration data of step (c-2) is calculated by (c2-1) the control unit controls the pollution source management module to receive the pollution source status data on the water quality prediction area from the attribute database of the GIS database step; (c2-2) determining, by the pollutant source management module, whether the received pollutant source data is a generation unit or an emission unit; (c2-3) if the source unit is determined according to the result determined in the step (c2-2), move to step (c2-4) to be described later; and if the source unit, the source control module calculates the load of pollution generation; (c2-4) calculating the pollution discharge load from the pollution generation load calculated by the source management module; (c2-5) the source control module calculating the delivery load by multiplying the pollution discharge load calculated by the delivery rate; And (c2-6) calculating the inflow concentration by dividing the delivered load calculated by the source management module by the outflow amount.

Hereinafter, the present invention will be described in detail with reference to examples, and detailed description will be made with reference to the accompanying drawings to help understand the present invention. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more clearly and easily describe the present invention to those skilled in the art. In the drawings like reference numerals refer to like elements.

1 is a block diagram of a freshwater lake management system using the GS according to the present invention.

Referring to Figure 1, the freshwater lake management system using the GS according to the present invention, the user computer (5) that allows the user to view the environmental information search, hydrological and water pollution prediction results for freshwater lake management; A graphical user interface (GUI), which is an interface for providing a graphic screen to the user computer 5; A data input / output unit (15) for inputting / outputting data on environmental information retrieval, hydrological and water pollution prediction results through the GUI to the user computer (5); Geographical and pollutant information on various pollutant sources can be provided to provide environmental information on the user's selected area.For example, databases including topographic maps, river maps, subwatershed plots, soil plots, administrative plots, and point source status and land use. An environmental information retrieval module 25, which is a program provided from a database including a current status, a water supply status, an environmental basic facilities status, and a river water quality status; A pollution source management module 30, which is a program for calculating pollution and delivery loads from pollution source status information on a region selected from the environmental information retrieval module 25; A water quality modeling module (35), which is a program for modeling water quality by estimating the amount of pollutant discharged and delivered from the amount of pollution and delivered load extracted from the pollutant management module 30; A hydrologic modeling module 40 which is a program for modeling a hydrologic prediction for pollution diffusion prediction from data regarding watershed inflow, watershed required water quantity, and watershed watershed balance data extracted from the attribute DB 45b to be described later; Figure DB 45a which stores geographical figure data for topographical maps, river maps, subwatershed plots, soil plots, administrative plots, etc. for environmental information retrieval, hydrology and water quality prediction, and each figure stored in the figure DB 45a. A GIS-DB 45 including an attribute DB 45b which stores data on point source status, land use status, water supply status, environmental foundation status, river water quality status, and the like regarding data; And a control unit 20 for controlling all of the above configurations so as to output the environmental information retrieval, hydrological and water quality prediction results requested by the user to the user computer 5.

Referring to Figure 1 with respect to the operation of the freshwater lake management system using the GS according to the present invention having the above configuration as follows.

First, the operation of the environmental information retrieval module 25 will be described. The user may use the computer 5 to obtain information about a desired area, for example, "owner weight map" through the computer 5. Select the menu to see the information. When the menu is selected, the command data is transmitted to the controller 20 via the GUI 10 and the data input / output unit 15. The control unit 20 receives the command data to drive the environment information search module 25, and the environment information search module 25 extracts "owning power factor" data about the region selected by the user from the figure DB 45a. Output to the data input / output unit 15. The data input / output unit 15 transmits "owner weight chart" data to the user computer 5 through the GUI 10 under the control of the control unit 20, and the user transmits a subwatershed chart related to the corresponding area through the computer 5. You can see the graphic screen.

In addition, if the user wants to obtain information regarding the "own pollutant" of the region, for example, the "point source status", the user selects a menu for viewing the "point source status" information about the region through the computer 5. . When the menu is selected, the command data is transmitted to the controller 20 via the GUI 10 and the data input / output unit 15. The control unit 20 receives the command data to drive the environmental information retrieval module 25, and the environmental information retrieval module 25 collects "point source status" data relating to the "owning power factor" of the region selected by the user. It extracts from the attribute DB 45b of the DB 45, and outputs it to the data input / output part 15. FIG. The data input / output unit 15 transmits the "point source status" data to the user computer 5 through the GUI 10 under the control of the controller 20, and the user transmits " "Point source status" can be viewed graphically.

In addition, when the pollutant source management module 30 calculates the pollutant load and the delivery load for water quality modeling, the pollutant source management module 30 controls the GIS- according to the control of the control unit 20 for the water quality modeling. The source status data of the desired area is read from the figure DB 45a and the attribute DB 45b of the DB 45 to determine whether it is a generation unit or an emission unit, and if it is a generation unit, the pollution generation load is calculated and the discharge rate is calculated here. Estimate the pollutant discharge load by multiplying. In the above-described discharge unit, the discharge load may be calculated as it is without multiplying the discharge rate. In addition, the delivered load is the basic data for the inflow concentration, which is an input data for water quality modeling, and is obtained by multiplying the discharge load by the delivery rate. That is, the pollution source management module 30 calculates the delivery load by multiplying the discharge load by the delivery rate. In this way, the delivered load is obtained, and dividing the delivered load by the outflow yields the inflow concentration.

In addition, when the operation of the hydrological modeling module 40 is described, when the user selects a modeling menu regarding hydrologic prediction for a desired region, the hydrological modeling module 40 is a figure DB of the GIS-DB 45. The total watershed data, the subwatershed data, the weather data, the tap water flow rate data, the tap water flow rate distribution rate data, and the measured flow rate data are read from the 45a and the attribute DB 45b, and the hydrologic data corresponding to the watershed characteristics are modeled, and the result is controlled by the control unit. 20 is displayed in a table and a graph on the user computer 5 via the data input / output unit 15 and the GUI 10 under the control of 20).

In addition, when the operation of the water quality modeling module 35 is described, when the user selects a modeling menu regarding water quality prediction for a desired region, the water quality modeling module 35 is obtained from the pollution source management module 30. The river water quality model and the lake water quality model are modeled using the concentration and the hydrologic modeling results of the hydrologic modeling module 40. That is, the water quality modeling module 35 performs a predetermined operation from the inflow concentration data output from the pollutant source management module 30 and the amount of inflow and intake according to the hydrologic modeling of the hydrological modeling module 40 to perform water quality modeling of streams and lakes. do. The modeled data is displayed as a table and a graph on the user computer 5 via the data input / output unit 15 and the GUI 10 under the control of the controller 20.

The freshwater lake management method using GIS according to the present invention having the above configuration will be described with reference to FIGS. 2 and 6.

2 is a flowchart illustrating a method for retrieving environmental information among freshwater lake management methods using GIS according to the present invention.

Figure 3 is a flow chart for explaining a method for calculating the pollution and delivery load in freshwater lake management method using the GS according to the present invention.

4 is a flowchart illustrating a hydrological prediction modeling method of the freshwater lake management method using the GS according to the present invention.

5 is a flowchart illustrating a water quality prediction modeling method of the freshwater lake management method using the GS according to the present invention.

6 is an exemplary view of a water quality prediction screen modeled by the freshwater lake management method using the GS according to the present invention.

Referring to FIG. 2, a method of searching for environmental information desired by a user is described. The user selects an environmental information search for a region desired by the user using the computer 5 (S100). If the user selects the "river map" of the desired area, the control unit 20 controls the environment information search module 25 to search the figure DB 45a of the GIS-DB 45 for the selected area. Read the "river" data (S200). The control unit 20 transmits the "river map" data read by the environmental information retrieval module 25 to the user computer 5 through the data input / output unit 15 and the GUI 10, and the data is transmitted to the computer 5. ) Is displayed on the screen (S300). The controller 20 determines whether the selection of the attribution information search for the selected figure is received from the user computer 5 (S400). If the user has not selected the attribute information search in step S400, the environmental information search is terminated, and the user searches for the attribute information. For example, if the user selects "the current state of waterworks" with respect to the selected figure "river", the controller 20 Controls the environmental information retrieval module 25 to read the "water supply status" data relating to "river" from the attribute DB 45b of the GIS-DB 45 (S500). The control unit 20 transmits the "water supply status" data read by the environmental information retrieval module 25 to the user computer 5 through the data input / output unit 15 and the GUI 10, and the data is transmitted to the computer 5. ) Is displayed on the screen (S600). After the operation as described above, the user can view the figure and the attribute information of the area desired by the user as a graph and a chart on the screen.

In addition, referring to FIG. 3, a method of calculating pollution and delivery loads is described. In step S500, the controller 20 stores pollution-related attribute data about a user selection area read by the environment information search module 25. Control and receive the management module 30 (S700). The pollution source management module 30 determines whether the pollution-related attribute data is a generation unit or an emission unit (S800). According to the result determined in step S800, if the discharge source unit is moved to step S1000 to be described later, if the source unit pollution source management module 30 calculates the pollution generation load (S900). The pollution source management module 30 calculates the pollution discharge load from the pollution generation load calculated above (S1000). The pollution source management module 30 calculates the delivery load by multiplying the delivery rate by the pollution discharge load calculated above (S1100). The pollution source management module 30 calculates the inflow concentration by dividing the estimated delivery load by the outflow amount (S1200). Through the above operation, it is possible to calculate the delivery load and the inflow concentration for the region selected by the user.

Referring to FIG. 4, a hydrologic prediction modeling method for a region selected by a user is described. In operation S1300, the user selects a region for which a hydrological prediction is desired using the computer 5. The control unit 20 controls the hydrologic modeling module 40 to GIS the total watershed data, the subwatershed data, the weather data, the water inflow data, the water inflow distribution data, and the measured outflow data, which are attribute data for predicting the hydrology of the region selected by the user. It reads out from attribute DB 45b of DB45 (S1400). The hydrological modeling module 40 receives the read data and models the hydrological surface through a predetermined operation (S1500). The hydrological modeling module 40 displays the modeled hydrologic prediction data on the user computer 5 via the data input / output unit 15 and the GUI 10 (S1600). Through the above operation, the user can view the hydrologic prediction modeling result of the desired area through a screen as a graph and a chart.

Finally, referring to FIGS. 5 and 6, a water quality prediction modeling method for a region desired by a user is described. For example, if a user performs water quality prediction modeling on the Dongjin River Basin, the user may use a computer 5 to predict the water quality. Select the "Dongjin River Basin" as the desired area (S1700). The control unit 20 controls the water quality modeling module 35 so that the inflow concentration data, the outflow data, and the intake concentration data, which are attribute data for predicting the water quality of the "Dongjin River Basin" selected by the user, from the pollution source management module 30. The outflow amount and the intake amount data are read out from the attribute DB 45b of the GIS-DB 45 (S1800). The water quality modeling module 35 receives the read data and models the water quality through a predetermined operation (S1900). The water quality modeling module 35 displays the modeled water quality prediction data on the user computer 5 via the data input / output unit 15 and the GUI 10 (S2000). After the operation as described above, the user can view the hydrologic prediction modeling results regarding the "Dongjin River Basin" through a screen as a graph and a diagram as shown in FIG.

Through all the above configurations and steps, in implementing the freshwater lake management system and method using GIS according to the present invention, the user can predict the water quality and water quality of the desired area.

In the above described with reference to the accompanying drawings, preferred embodiments of the present invention in detail. However, embodiments of the present invention may be variously modified or applied by those skilled in the art, the scope of the technical idea according to the present invention should be determined by the claims below. will be.

According to an aspect of the present invention, by establishing a GIS-based modeling support system for freshwater lake management can contribute to the systematic cleanup, management and preservation of pollutant data for water quality management of freshwater lake-related agricultural water.

According to another aspect of the present invention, the pollution source information stored in the GIS-based database predicts the spread of pollution in the water system by hydrologic modeling, and supports the water quality modeling for the water quality prediction loaded in the streams and lakes.

According to another aspect of the present invention, by providing a convenient GIS-based modeling environment, it is possible to provide a more systematic freshwater lake management method by simplifying the process for model execution, and by providing a simple method for checking the model execution results.

According to another aspect of the present invention, by predicting the water pollution through GIS-based modeling, it is expected that it is possible to apply the measures to improve the water quality suitable for the local characteristics, based on the results of the management of pollutants in the watershed, grasp the water quality status And water pollution prevention measures can be established to effectively improve the water quality of freshwater lakes.

Claims (6)

In the system that manages the water quality of freshwater lakes based on the GIS database in which information about the local environment is established, A GUI providing an interface for providing a graphical display to a user computer; A data input / output unit for inputting / outputting data on environmental information retrieval, hydrological and water pollution prediction results to the user computer through a GUI; Point source status, land use status, water supply for geometries and geography data for topographical maps, river maps, subwatersheds, soil maps, administrative plots, etc. A GIS database including an attribute database that stores data on current status, environmental infrastructure status, and river water quality; An environment information retrieval module, which is a program for providing environment information on a region selected by a user from figure data and attribute data stored in the GIS database; A pollution source management module, which is a program for calculating pollution and delivery loads from pollution source status data of attribute data of a region selected from the environmental information retrieval module; A water quality modeling module, which is a program for modeling water quality from the pollution and the amount of suspended loads extracted from the pollution source management module; A hydrologic modeling module, which is a program for modeling a hydrologic prediction for pollution diffusion prediction from data on watershed inflow, watershed required quantity, and watershed water balance extracted from attribute data of the GIS database; And And a controller for controlling all the configurations to output the environmental information search, the hydrological and the water quality prediction results requested by the user to the user's computer. The method of claim 1, wherein the attribute database, Freshwater lake management system using GIS, characterized in that it further comprises the total watershed data, subwatershed data, weather data, water inflow data, water inflow rate distribution data, measured flow rate data, runoff data, water intake data of the area selected by the user. In the method of managing the water quality of freshwater lakes based on the GIS database in which information about the local environment is established, (a1) receiving a selection of environment information retrieval regarding a region desired by the user himself; (a2) controlling, by the controller, the environment information retrieval module to search the figure database of the GIS database to read figure data of the selected region; (a3) a control unit transmitting figure data read by the environment information retrieval module to a user computer through a data input / output unit and a GUI to display on a screen; (a4) determining, by the control unit, whether the selection of the attribution information search for the selected area is received from the user computer; (a5) if the user selects the attribute information search in the step (a4), the control unit controls the environment information search module to read attribute data of the selected region from the attribute database of the GIS database; And and (a6) a control unit transmitting the attribute data read by the environmental information retrieval module to a user computer through a data input / output unit and a GUI, and displaying the attribute data on the screen. In the method of managing the water quality of freshwater lakes based on the GIS database in which information about the local environment is established, (b1) receiving a selection of an area for which a user is to be hydrographed; (b2) The control unit controls the hydrologic modeling module to convert the total watershed data, subwatershed data, meteorological data, water inflow data, water inflow distribution data, and measured outflow data into the GIS database. Reading from a database; (b3) receiving the data read by the hydrological modeling module and modeling the hydrological surface through a predetermined operation; And (b4) displaying the hydrologic prediction data modeled by the hydrologic modeling module under the control of the controller on a user computer through a data input / output unit and a GUI; and a freshwater lake management method using GIS. In the method of managing the water quality of freshwater lakes based on the GIS database in which information about the local environment is established, (c1) receiving a selection of a region where water quality prediction of the user is desired; (c2) The control unit controls the water quality modeling module so that the inflow concentration data, the inflow concentration data, the inflow concentration data among the inflow concentration data, the outflow data, and the intake volume data for the water quality prediction of the area selected by the user, the outflow volume from the pollution control module, and the intake data are the attributes of the GIS database. Reading from a database; (c3) receiving water read by the water quality modeling module and modeling water quality through a predetermined operation; And (c4) displaying the water quality prediction data modeled by the water quality modeling module on a user computer through a data input / output unit and a GUI under the control of a controller. The method of claim 5, wherein the calculation of the inflow concentration data of the step (c-2), (c2-1) the control unit controlling the pollution source management module to receive the pollution source status data regarding the water quality prediction area from the attribute database of the GIS database; (c2-2) determining, by the pollutant source management module, whether the received pollutant source data is a generation unit or an emission unit; (c2-3) if the discharge source unit is determined according to the result determined in the step (c2-2), the process moves to step (c2-4) to be described later; (c2-4) calculating the pollution discharge load from the pollution generation load calculated by the source management module; (c2-5) the source control module calculating the delivery load by multiplying the pollution discharge load calculated by the delivery rate; And (c2-6) source control module for calculating freshwater inflow concentration by dividing the estimated delivery load by the outflow amount; freshwater lake management method using GIS comprising a.