Research on applicability of non-point source pollution model of water network plain of Taihu Lake

Point source pollution has been gradually controlled effectively in water network plain of Taihu Lake Basin,however non-point source pollution is still one of the main reasons for the water quality deterioration.The AnnAGNPS was introduced to simulate and research the non-point source pollution in Xueyan Town of the basin.In the application of the model,the spatial and attribute database was established including digital elevation model,soil texture and land use,and by the ways of field test,investigation and research etc.,the meteorological parameters,crop parameters,crop management parameters,runoff curve number,Manning coefficient,nitrogen and phosphorus input parameters were determined.To calibrate and validate the model,the water quality and quantity were monitored simultaneously.The simulation results show that the model is feasible and applicable for the water network plain of the basin;the simulation effect of nitrogen is better than phosphorus.The model provides a foundation to strengthen the study on the non-point source pollution in water net plain and also a scientific support to prevent the eutrophication in Taihu Lake.