SWAT模型参数修正及应用——以德泽水库径流区为例

Modification of SWAT Model Parameters and Application:Case Study on the Runoff Area of Deze Reservoir

受人类活动和重大水利项目的影响,SWAT模型在对河道参数和平均坡长的计算中存在一些缺陷。通过遥感技术和经验公式对不合理的参数进行了修正。在对参数进行修正后,选取对水文、水质过程较为敏感的参数运用SWAT-CUP软件对模型进行优化,其率定和验证精度均达到了较为满意的效果(径流量R^(2)在0.7643~0.9674之间、NS在0.7548~0.8998之间,总氮负荷R^(2)在0.5462~0.6599之间、NS在0.5268~0.6388之间),结果表明在其他参数不变的情况下,这种修正方式不仅可以更好反应流域内真实的地形地貌及河道信息,同时可提高模型月尺度径流的模拟精度(R^(2)从0.8349提升到0.8719,NS从0.6987提升到0.7718)。可实际应用于德泽水库径流区。

Affected by human activities and major water conservancy projects,the SWAT model has some shortcomings in the calculation of river parameters and average slope length.We use remote sensing technology and empirical formulas to modify the unreasonable parameters.After modifying the parameters,we select parameters that are more sensitive to hydrology and water quality processes and employ SWAT-CUP software to optimize the model.The calibration and verification accuracy are satisfactory.The R^(2)and NS of runoff is 0.7643-0.9674 and 0.7548-0.8998,respectively,and the R^(2)and NS of total nitrogen load is 0.5462-0.6599 and 0.5268-0.6388,respectively.The results indicate that given the other parameters unchanged,the present method better reflects the real topography and river channel information in the basin,and also improves the simulation accuracy of the model’s monthly runoff.R^(2)increased from 0.8349 to 0.8719,and NS increased from 0.6987 to 0.7718.