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Determination method of river non-point source pollution load in plain river network area based on grid processing

A non-point source pollution and plain river network technology, applied in the environmental field, can solve the problems of the non-point source pollution model cannot be directly applied, and the boundary of the non-point source sink area is difficult to demarcate.

Active Publication Date: 2019-08-20
HOHAI UNIV
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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 confluence area in the plain river network area, and the existing non-point source pollution models cannot be directly applied to this area

Method used

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  • Determination method of river non-point source pollution load in plain river network area based on grid processing
  • Determination method of river non-point source pollution load in plain river network area based on grid processing
  • Determination method of river non-point source pollution load in plain river network area based on grid processing

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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 method for determining the non-point source pollution load of a river channel in a plain river network area based on grid processing. The grid processing technology and the GIS space superposition analysis function are adopted, and the cross-sectional area of ​​the river channel and the minimum distance from the grid to the surrounding river channels are used. The ratio is the weight, and the confluence weight factor is calculated to determine the range of the confluence area of ​​each river and the corresponding land use area of ​​each type. The specific steps include: drawing river network polygons, calculating domain rasterization and spatial operations, calculating the confluence weight factor, determining the flow direction of non-point source pollution, dividing the confluence area of ​​non-point source pollution, counting the area of ​​land use types, calculating the pollution load per unit area, and calculating the river course Non-point source pollution load. The present invention solves the problem that the limit of the confluence area in such areas is difficult to determine by proposing a method for determining the confluence area of ​​non-point source pollution reflecting the water system characteristics of the plain river network area, and is easy to popularize and apply in the pollution load calculation of areas with similar 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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Patent Type & Authority Patents(China)
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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