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根据实测地表径流和降雨量数据,用SWAT(Soil and Water Assessment Tool)模型对汾河的二级支流-潇河流域的地表径流进行了模拟和验证,并分析了地表径流与降水量以及地表径流与土地利用之间的关系。结果表明:(1)SWAT模型可以较好地模拟潇河流域地表径流的年际和年内变化过程(率定期r=0.88;验证期r=0.78)。在降水量较多、产流较大的年份其模拟效率更高(r=0.98);(2)地表径流模拟值与降水量的变化呈显著正相关(r=0.865),且降水量的大小对地表径流的残差有影响;(3)在径流产流量贡献方面,林地最大(r=0.647),草地次之(r=0.581),耕地最弱(r=0.1),而在面积占比中草地(48.43%)却远大于林地(28.65%),可见一定程度上草地保持水土,涵养水源的能力要略好于林地。
According to the measured surface runoff and rainfall data, the surface runoff of the second tributary of the Fenhe River in the Xiaohe River Basin was simulated and verified by using SWAT (Soil and Water Assessment Tool) model. The effects of surface runoff, precipitation and surface runoff Relationship with land use. The results show that: (1) The SWAT model can simulate the interannual and annual variations of surface runoff in Xiaoxi River basin (r = 0.88, r = 0.78). (R = 0.98). (2) There is a significant positive correlation between simulated runoff and precipitation (r = 0.865), and the magnitude of precipitation (R = 0.647), followed by grassland (r = 0.581) and the weakest cultivated land (r = 0.1), while in the proportion of area The grassland (48.43%) is much larger than the forest land (28.65%), showing that the grassland can maintain water and soil to a certain extent and the water conservation ability is slightly better than that of the forest land.