Prediction of Reservoir Water Quality Considering the Impacts of Non-point Source Pollution

The watershed non-point pollution model AnnAGNPS and water quality model CE-QUAL-W2 were integrated to apply.Outputting the non-point source pollution loads based on AnnAGNPS model and converting the loads as the inputs of CE-QUAL-W2 model,this paper attempts to predict the water quality of Jinpen reservoir and study the impacts of the non-point source pollutions on water quality.Results show that:(1) non-point source pollutions have greater impacts on water quality of Jinpen reservoir in the flood period than in the non-flood period;(2) the impacts of non-point source pollutions on water quality make a great difference between longitudinal and vertical water qualities;(3) forests play a significant role in the reduction of non-point source pollution in the watershed;(4) when predicting the water quality of reservoir,non-point source pollutions should be treated differently in the flood and non-flood periods.