Non-point Source Pollution Load Calculation Based on Raster Data and Export Coefficient Model

摘要

The article is focused on the surrounding land area of Zhihugang of Taihu Basin, the study area was divided into square grid of 100m on a side, all grid units land use types attribute values were identified according to the regional land use types, raster data model applied to land-use information was set up. Export coefficient of the total nitrogen (TN hereafter) and total phosphorus (TP hereafter) in different land types of non-point source (NPS hereafter) pollution was confirmed synthesizable, the NPS pollutant yielding model based on raster data model was set up, as a result TN and TP load in non-point source pollution was obtained by computation.