Rasterization-based method of determining river surface source pollution load in plain river network area

A non-point source pollution and plain river network technology, applied in the environmental field, can solve problems such as the difficulty of dividing the boundary of non-point source and sink areas, and the inability to directly apply non-point source pollution models.

Active Publication Date: 2018-11-02
HOHAI UNIV
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  • Application Information

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Problems solved by technology

The special landform and water system characteristics make it difficult to delineate the boundaries of the non-point source and co...

Method used

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  • Rasterization-based method of determining river surface source pollution load in plain river network area
  • Rasterization-based method of determining river surface source pollution load in plain river network area
  • Rasterization-based method of determining river surface source pollution load in plain river network area

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the accompanying drawings and an actual calculation example in a certain plain river network area in eastern my country.

[0072] (1) Draw river network polygons

[0073] figure 1 It is a water system map of a plain river network area in eastern my country. The rivers in this area are criss-crossed, and the water system forms a typical network structure. Through the topological analysis of the river network structure, several polygons surrounded by adjacent river channels are generated, which are called "river network polygons", such as figure 2 shown.

[0074] The non-point source pollution generated in the polygon of the river network will flow into the surrounding rivers along with the rainfall-runoff. In order to calculate the non-point source pollution load and the confluence process in this area, it is first necessary to determine which river channel the non-point source pollution in eac...

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Abstract

The invention discloses a rasterization-based method of determining a river surface source pollution load in a plain river network area. According to the method, based on a rasterization technology and a GIS spatial overlay analysis function, a confluence weight factor is calculated with a ratio of a river section area to a shortest distance between a grid and a surrounding rive as a weight, and aconfluent area range of each river and utilization area of corresponding type of land are determined. The method comprises specific steps of drawing a river network polygon, calculating area rasterization and performing spatial operation, calculating the confluence weight factor, determining a flow direction of the surface source pollution, dividing a confluent area of the surface source pollution, calculating use areas of different types of land, calculating a pollution load per unit area, and calculating the river surface source pollution load. The method determines the surface source pollution confluent area reflecting characteristics of water systems of the plain river network area, making it easier to determine a boundary of a confluent area of the area and being easy to promote anduse in calculation of pollution load of areas with the same water system characteristics.

Description

technical field [0001] The invention relates to a method for determining the non-point source pollution load of a river channel in a plain river network area based on grid processing, and belongs to the field of environment. Background technique [0002] According to different emission methods, pollutants can be divided into two categories: point source and area source. Calculation of pollution load is an important basic work for carrying out water environment management in river basins. However, due to the randomness of the occurrence of non-point source pollution, the complexity of the mechanism process, the uncertainty of the emission pathway, and the differences in time and space distribution, it is difficult to obtain its emissions through investigation and monitoring on a large time and space scale. Therefore, mathematical model methods are usually used to estimate the non-point source pollution load. [0003] At present, the relatively mature non-point source pollut...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/18
Inventor 王鹏王船海马腾飞王一丹郝少盼谢增芳
Owner HOHAI UNIV
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