Pollution load estimation and source analysis in the Yu River Basin, Shanxi province

Pollution load estimation and source analysis are fundamental tasks of water environment management.Based on monitoring and statistical data,considering point source and nonpoint source pollution,water pollution loads and main pollution sources in 2016 were analyzed in the Yu River Basin,Shanxi Province.Based on the digital elevation model and positions of monitoring stations,the river basin was divided into six control units with support of Geographical Information System (GIS),an estimating method of pollution loss is proposed to calculate the pollution load from different pollution sources.The results showed that in 2016,7 299.52 tons of COD,1 163.56 tons of NH3-N, and 124.46 tons of TP were discharged into the Yuhe,of which 70.04%,86.45% and 68.00% were from point source pollution.The spatial analysis indicated that pollutants mainly came from the upstream of the Shili River and the Yu River,and was mainly ascribed to uncollected point source pollution,and contribution rates of COD,NH3-N and TP were 46%,80% and 49%,respectively.The results provided a scientific basis for water environment management in the Yu River Basin.

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