基于SWAT模型的鄂西犟河流域非点源污染模拟

分析非点源污染对于水污染防治具有重要的指导意义，运用数学模型模拟是非点源污染研究的重要方法之一.该文为了解犟河流域的非点源污染的时空分布特征，为当地提供污染防治的研究依据，基于SWAT(soil and water asssesment tool)模型，在缺乏水文资料的犟河流域采用参数移植法进行非点源污染模拟.结果表明：可以采用参数移植法，通过上级流域的模拟得到用于犟河流域模拟的各参数.模型模拟精度评价分别为(氨氮R2＝0.77，NSE＝0.75；总磷R2＝0.77，NSE＝0.73).研究表明SWAT模型在犟河流域具有适用性，基于SWAT模型进行的非点源污染模拟的时空分布特征明显，犟河流域经过多年治理，其污染负荷量均表现出下降的趋势.

Simulation of non point source pollution in the Jiang River Basin of Western Hubei Province based on SWAT model

The analysis of non-point source pollution is an important guideline for water pollution prevention and control. The use of mathematical model simulation is one of the important methods for the study on non-point source pollution. In order to understand the spatial and temporal distribution characteristics of non-point source pollution in the Jiang River Basin and to provide the research basis for local pollution prevention and control， based on SWAT (soil and water assessment) model， the non-point source pollution simulation was carried out by using the parameter transplantation method in the Jiang River Basin， where the hydrological data were scarce. The results show that the parameters for the simulation of the Jiang River Basin are able to be generated from the simulation of the upper watershed by parameter transplantation method. The simulation accuracy of the model was as follows R2＝0.77， NSE＝0.75 for ammonia nitrogen； R2＝0.77， NSE＝0.73 for total phosphorus. It's also found that SWAT model is applicable in the Jiang River Basin. The spatial and temporal distribution characteristics of non-point source pollution simulation based on SWAT model are obvious. After years of governance， the pollution load of the Jiang River Basin exhibits a decreasing trend.