A Calculation Method of Small Watershed Environmental Capacity Supported by GIS Technology

Abstract

The invention relates to a method for calculating a small watershed environmental capacity under the support of GIS (Geographic Information System) technology. The problem of imprecise calculation result which is caused by the influence of a non-point source or the difference of river inlet quantity of the non-point source of each control unit is solved. The method comprises the following steps of determining the watershed range of the control unit; using a hydrologic analysis module in an ArcGIS software and the method of combining practical river data positioned and corrected by GPS (Global Position System) to determine the land area catchment range of the control unit so as to obtain the control unit for land and water response; evaluating the water quality status; using statistic data of a pollution source and combining the practical study result of the pollution source to summarize the pollutant river inlet quantity of the pollutant of a point source and the non-point source according to the control units; reversely calculating the flow of each control cross section according to water balance; and calibrating, verifying and using water quality model parameters, and deducting the non-point source pollutant inlet of each control unit to obtain the available water environmental capacity. The river inlet quantities are calculated by considering the emission difference of non-point source pollutants in each control unit by using the GIS technology, and the watershed available environmental capacity is determined.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource comprehensive utilization, in particular to a method for calculating the environmental capacity of a small watershed supported by GIS technology. The small watershed refers to a watershed of a tributary river connected with a main river. Background technique [0002] The "National Water Environment Capacity Verification Technical Guidelines" pointed out that "according to the water environment function zoning and water quality objectives, according to the hydrological characteristics of the river section, the distribution of sewage outlets into the river and other factors, calculate the water environment capacity of the water environment function area and water body, and further implement The total volume control of water pollutants is the main means to achieve the water quality goals of the water environment function zone, the fundamental method to ensure the quality ...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the existing small watershed water environment capacity calculation method, the technical problem to be solved in the present invention is to establish a new small watershed environmental capacity calculation method supported by GIS technology to determine the small watershed water environment capacity, which can not only overcome the When calculating the water environment capacity of small watersheds, it is difficult to start due to the lack of hydrological and other data, and it can also avoid the capacity calculation caused by not considering the impact of non-point sources or not considering the differences in the amount of non-point sources entering the river in each control unit If the results are not accurate enough, improving the accuracy of water environment capacity calculation is beneficial to the management of river ecological environment

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