Evaluation of agricultural non-point pollution in Baiyangdian Lake Basin using SWAT model

摘要

This paper selected the Baiyangdian Lake basin as the objective study area and carried out an agricultural non-point pollutants simulation based on the SWAT model. With the support of remote sensing and related geographical information, stream network, sub-basins division, land use and land cover distribution, and soil distribution, were prepared for SWAT model. Gauged precipitation, runoff, and pollutants data from 1998 to 1999 were adopted to calibrate and validate the SWAT model parameters. Three scenarios, viz. the installation of vegetable filter strip, the preventive soil loss measures, and the fertilizing control measures for crops were applied and analysed. The results showed that the operation, viz. the contour tillage, strip cropping on the contour, and terrace systems in the scenario II was the most effective operation and the efficiency was 29.9%, 17.3%, and 16.9% for sediment, TN, and TP loadings, respectively.