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Identification of Point and Nonpoint Source Pollution in Small Watersheds with Limited Data

Author(s)

Zhuo Zhang1, Jing Zhang2, Xinhua Zhang1,*

Affiliation(s)

1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China 2Sichuan Water Resources Survey and Design Research Co., Ltd., Chengdu, China *Corresponding Author.

Abstract

Accurately identifying pollution sources within a watershed is crucial for water pollution prevention and precise management. The Simeng River Basin was once one of the 32 key pollution control sub-watersheds in Sichuan Province, characterized by significant agricultural non-point source pollution. Before environmental remediation, the water pollution prevention and control situation in the watershed was not optimistic. This paper takes this basin as the research object, uses the Soil and Water Assessment Tool (SWAT) model to simulate the pollution sources (total phosphorus) within the basin. Based on the Total Maximum Daily Loads (TMDL) plan, it calculates the allowable load flux and the actual current load flux of the water body, determines whether the water quality meets the standards, and identifies the point and non-point sources of pollution exceeding the standards, determining the reduction rate for the excess pollution load.

Keywords

Pollution Source Identification; Simeng River Basin; The Total Maximum Daily Loads Plan; The Soil and Water Assessment Tool Model

References

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