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以SWAT模型为工具,对太湖西苕溪流域进行了径流模拟,采用1988—2001年范家村水文站逐日、逐月实测径流资料对模型进行了参数率定和模型验证,效率系数均大于0.88,径流相对误差均小于4%。在此基础上,重点分析了西苕溪流域的降雨—径流关系和水量平衡。结果表明,研究时段内西苕溪流域降雨—径流关系变化不明显;西苕溪流域的降雨年际分布不均匀;受降雨影响,雨季月径流量和洪峰值均有缓慢上升的趋势。水量平衡分析表明,河道径流、蒸散发、地下水补给量分别占降雨量的54.1%,45.8%,17.3%。
The SWAT model was used as a tool to simulate the runoff of Xitiaoxi Lake in Taihu Lake. The daily and monthly runoff data of Fanjiacun Hydrologic Station from 1988 to 2001 were used to conduct parameter calibration and model verification. The efficiency coefficients were all greater than 0.88. The runoff The relative errors are less than 4%. On this basis, we focus on the rainfall-runoff relationship and water balance in Xitiaoxi River Basin. The results showed that there was no obvious change in the relationship between rainfall and runoff in Xitiaoxi River Basin during the study period. The interannual distribution of rainfall in Xitiaoxi River Basin was not uniform. Both the monthly runoff and flood peak value of the rainy season tended to increase slowly due to the rainfall. Water balance analysis shows that river runoff, evapotranspiration and groundwater recharge amount to 54.1%, 45.8% and 17.3% of the rainfall respectively.