Study Of Pollution Loading Model In The Area Of Typical Plain River Network

With the deterioration of water environment increasingly, it is urgent to found a pollution load model which can image the whole status in a district. In this paper, some recent study results on pollution load model are summarized, especially nonpoint pollution load model. The study is done for the mechanism study on producing, moving and transforming of different pollutants in different areas. Great deals of experiments were carried out in Meilin watershed of Yixin, which drew the loss law of agricultural nonpoint pollutants. Applying the experiment results, this paper have made some improved on the pollution load model. 1 .The model is more reasonable by investigating the directions and distribution proportions of pollution load. 2.The time distribution of pollution load is considered, especial the output of pollution load corresponding the course of rain. 3.Adopting the numerical system of the watershed based on GIS, which made the space distribution of pollutants more accurate and reasonable. Finally, above-mentioned pollution load model is used in Wuxi district.Setting up the water quantity and water quality models about TP, NH4 and CODcr. For TP, we consider the adsorption and analysis process. The pollution load model is tested according to the the water quantity and water qualiry models. The results indicates that this model can simulate the distributing status of pollutants in the river network well. It is concluded that the model and methods can provide scientific basis for the water resources administration and decisions which has great practical significance.