基于SWAT模型的石臼湖流域面源污染特征分析

Characteristics of Non-point Source Pollution in Shijiu Lake Basin Based on SWAT Model

近年来石臼湖部分入湖河流水质有所波动,为了解石臼湖流域面源污染特征,基于分布式水文模型SWAT,定量计算流域面源污染负荷以及识别污染治理关键区,研究表明:模型径流、氮负荷和磷负荷模拟评价指标决定系数R2均大于0.6,SWAT模型在研究区域有较好的可适用性;石臼湖流域2018年总氮负荷总量为2783.44 t/a,总磷负荷总量为100.17 t/a,氮、磷污染物主要通过中流河进入石臼湖;当涂县农业面源污染是石臼湖流域面源污染防治的重点。研究成果对流域尺度面源污染控制和管理有一定的理论和实践意义,可作为石臼湖流域水资源保护、面源污染控制的依据。

In recent years,the water quality of the rivers around the Shijiu Lake has fluctuated.In order to understand the characteristics of non-point source pollution in Shijiu Lake basin,the non-point source pollution load of Shijiu Lake basin was calculated quantitatively based on distributed hydrological model SWAT and the key areas of pollution control were identified.The results showed that the coefficient of determination R2 the simulated evaluation indexes of runoff,nitrogen and phosphorus load were all greater than 0.6,indicating that the SWAT model had good applicability in the study area.The total nitrogen load and phosphorus load in Shijiu Lake basin were 2783.44 t/a and 100.17 t/a,respectively.Nitrogen and phosphorus pollutants mainly entered Shijiu Lake through Zhongliu River.Agricultural non-point source pollution in Dangtu county was the key point of preventing and controlling non-point source pollution in Shijiu Lake basin.The research results have certain theoretical and practical significance for the control and management of non-point source pollution in the watershed scale,and can be used as the basis for water resources protection and non-point source pollution control in Shijiu Lake Basin.