基于SWAT模型的晋江西溪流域产沙模拟

Sediment Simulation in Xixi Watershed of the Jinjiang Basin Based on SWAT Model

应用流域分布式水文模型SWAT,对东南沿海晋江流域1972-1979年的年、月产沙进行模拟,选取相对误差RE,绝对误差MD,效率系数Ens,决定系数R2等4个指标用于模型适用性评价,并利用模型输出结果进行流域水土流失空间差异研究.研究结果表明该模型适用于东南沿海流域的产沙模拟,且精度较高;模型在降水量大的情况下,模拟的精度较高;西溪流域在模拟期内轻度侵蚀面积和中度侵蚀面积广布,分别占研究区总面积的46.0%和45.4%.

The sediment yield from 1972 to 1979 of the upper watershed of Xixi River, which is located in the Jiniiang basin, is simulated with the distributed SWAT （Soil and Water Assessment Tool） model. The simulation results are obtained with the accuracy of a R^2 of 0. 78 and an Ens of 0.79 over the 8 years continuous simulations on monthly sediment yield. It shows that SWAT model could be successfully used to model the sediment yield in the southeast coastal watershed and the model performs better in the months of abundant flow. The results also demonstrate that the soil erosion areas distribute over almost the whole region during the periods, including 46.0% light degree erosion and 45.4% middle degree erosion.