A Simulation of Non-Point Source Pollution Loads Using a RS&GIS Model

A water quality model large-scale Non-Point Source pollution model was widely applied to deal with nonpoint source pollution in China. In this paper, the model was improved by adjusting the time step. The time scale of the solution module was modified to one day and half a month for the adhesion module. The Non-Point Source pollution loads in Haikou in 2008 were calculated by using the new model. The results show that the major pollutants of Haikou were the COD from large and small livestock, and the soluble pollution loads were much larger than the adsorbed pollution loads. Pollution loads of all types showed evident temporal and spatial trends. Moreover, the NPS pollution loads were dramatically larger in the flood season than in dry season. The distribution of average load of Non-Point Source pollution in Haikou originated from different areas showed significant spatial differences.