Calculation method of drainage basin agricultural non-point source pollutant riverway reduction coefficient

Abstract

The invention provides a calculation method of a drainage basin agricultural non-point source pollutant riverway reduction coefficient. The calculation method comprises the following steps: obtaining typical small drainage basin data in a target drainage basin; according to the typical small drainage basin data, constructing a soil and water assessment tool (SWAT) of a typical small drainage basin; according to the SWAT, obtaining the load Load<Lr> of nitrogen and phosphorus, which enter a riverway, of each sub riverway and a contribution rate Load<Lo> of each sub riverway to a water outlet of the riverway in the typical small drainage basin; and according to drainage system data, obtaining the total length Length<Lr> of the riverway in the typical small drainage basin; and according to the Load<Lr>, the Load<Lo> and the Length<Lr>, obtaining a target drainage basin agricultural non-point source pollutant riverway reduction coefficient. The method can simply, accurately and quickly obtain the drainage basin agricultural non-point source pollutant riverway reduction coefficient, is low in cost and can be comprehensively spread on a large scale.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a calculation method for river channel reduction coefficient of agricultural non-point source pollutants in a watershed. 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]...

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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.

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