Abstract：In order to estimate the non-point source (NPS) pollution loads of nitrogen and phosphorus in the Taizihe watershed quantitatively, after a detailed field survey and data collection, the method of unit load and export coefficient modeling and the soil and water assessment tool (SWAT) were comprehensively used to simulate the runoff, sediment and nutrients loads during 1997to 2008. Based on the observed runoff, sediment loads and water quality data, detailed calibration and validation of multi-parameters, multi-objective and multi-site were carried out. Then, the temporal and spatial distribution of NPS pollution loads of nitrogen and phosphorus load was analyzed. The results showed that the simulation of runoff was pretty good. The simulation results of sediment and nutrients loads met the requirements. The model had good adaptability in the Taizihe watershed and was available. The model could be used to simulate and analyze the NPS pollution problems. The annual average loads of the TN and TP from 1997 to 2008 were 17357.43t and 7110.91t. The temporal and spatial distribution of the TN and TP loads was affected greatly by the process of rainfall-runoff. The total load during the flood season (from June to September) accounted for 77.76% and 80% of the annual load. The spatial distribution of the TN and TP loads varied greatly, with the long-time average annual values of the TN being 13.20kg/hm2and TP being 5.41kg/hm2. The Dengta City and the Liaoyang County, located in the middle and lower of the Taizihe watershed, were the critical source areas of NPS pollution.
罗倩, 任理, 彭文启. 辽宁太子河流域非点源氮磷负荷模拟分析[J]. 中国环境科学, 2014, 34(1): 178-186.
LUO Qian, REN Li, PENG Wen-Qi. Simulation study and analysis of non-point source nitrogen and phosphorus load in the Taizihe Watershed in Liaoning Province. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(1): 178-186.
