Estimation method for load of watershed agricultural non-point source pollutants into lake

Abstract

The invention provides an estimation method for load of watershed agricultural non-point source pollutants into a lake. The estimation method includes acquiring data of a typical small watershed in a target watershed, creating a SWAT (soil and water assessment tool) of the typical small watershed, and acquiring LoadLr and LoadLo in the typical small watershed according to the SWAT; acquiring planting industry source, livestock and poultry industry source, aquaculture industry source and rural life source pollutant producing and discharging coefficients of each sub watershed of the typical small watershed, and combining basic information survey data to acquire LoadLs in the typical small watershed; acquiring target watershed agricultural non-point source pollutant ditch reduction factor Factorcr according to the LoadLs and the LoadLr; acquiring LengthLr according to water system data; acquiring target watershed agricultural non-point source pollutant riverway reduction factor Factorrr according to the LoadLr, the LoadLo and the LengthLr; acquiring target watershed agricultural non-point source nitrogen and phosphorus discharge load and the total length LengthBr of an inner riverway of the target watershed; acquiring the load of the target watershed agricultural non-point source pollutants into the lake according to the target watershed agricultural non-point source nitrogen and phosphorus discharge load, the Factorcr, the Factorrr and the LengthBr. By the method, the total load of the watershed agricultural non-point source pollutants into the lake can be acquired simply, accurately and rapidly, cost is low and large-scale comprehensive implementation is achieved.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method for estimating the load of watershed agricultural non-point source pollutants into a lake. Background technique [0002] With the rapid development of agriculture, the amount of chemical fertilizers and pesticides, the number of livestock and poultry breeding, and the living standards of rural areas have increased rapidly, and agricultural non-point source pollution has gradually become one of the main factors affecting the quality of water environment. Since the current agricultural non-point source pollution is random, intermittent, and wide-area, and there are complex physical, chemical, and biological processes in the transmission process of pollutants from pollution sources to ditches and rivers, it determines the agricultural non-point source pollution of the watershed. Difficulty in quantitative estimation of load into the lake. [0003] At present, the calc...

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the model and the large demand for basic data and parameter data, its application effect on a large scale is restricted to a certain extent.

[0005] At present, there is no method for estimating the migration of agricultural non-point source pollution loads for different confluence characteristics at the watershed scale in my country.

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