不同于山区丘陵地区，平原圩区地形平坦，河网交错，水文过程复杂不确定，且缺乏有效的水文观测数据，因此SWAT模型的构建和应用受到较大的限制。以赣江下游平原圩区蒋巷联圩为例，在充分调查研究区水文过程的基础上，结合人工干预技术，经过电排站出口和河道概化、汇水区划分和子流域边界修正，完成了研究区SWAT模型子流域概化；以2006年－2008年圩区电排站的抽水量数据为基础，进行了圩区水文过程模拟。结果表明，各汇水区率定期的决定系数R2达到0.63以上，Nash-Sutcliffe效率系数NSE达到0.70以上；验证期R2达到0.70以上，NSE达到0.79以上。采用人工干预的方法能使SWAT模型子流域划分更加符合实际，使SWAT模型能够应用于平原圩区，并达到较好的水文过程模拟效果。

Different from the mountainous and highland area, the application of SWAT model in the polder area is quite difficult and limited, because the polder areas in plain region have flat topography, complicated and uncertain hydrologic processes due to various pumping and irrigation stations, and usually no useful monitored hydrological data. In this paper, the JiangXiang polder of the down-stream Ganjiang River was selected for case study, and subbasin delineation, which is a key step for a successful SWAT application, was carried out under manually corrections of drainage area boundary demarcation, multi-outlet definition, and “Burn-in” technique. Then hydrologic processes of the polder area were simulated based on SWAT model, and the pumping discharge data in the year of 2006~2007 and 2008 was applied for model calibration and validation, respectively. The results showed that the coefficient of determination (R2) and Nash-Sutcliffe coefficient (NSE) in each drainage area were greater than 0.63 and 0.70 respectively in calibration period, and R2 and NSE were greater than 0.70 and 0.79 respectively in validation period. It shows that subbasin delineation results are quiet agreeable with the actual situation by using manually correction techniques, so that SWAT model is applicable for hydrological modeling in the polder area and can obtain reasonable simulation results.

国家“十一五”科技重大专项“水体污染控制与治理”项目课题(2009ZX07526-005);中央高校基本科研业务费专项