不同气候情景下土地利用变化对径流 系数影响研究

本文研究了3种气候情景下流域土地利用变化对径流系数的影响;即应用SWAT ( Soil and Water Assessment Tool)模型分别对1980年、1995年和2000年的土地利用建模，然后进行了 3种气候条件和3种土地利用9种组合情景的径流模拟分析，并对相应径流系数的变化进行了对比。结果表明:土地利用变化对流域产汇流有一定的影响，且降水条件不同，土地利用对径流量和径流系数的影响亦不同，其中在比较干旱和接近正常降水条件下，径流量和径流系数对林地的减少比较敏感。

Study on impact from change of land-use on runoff coefficient under different climate scenarios

The impact from change of river basin land-use on runoff coefficient under three climate scenarios is studied herein;i.e.the models are respectively established for the land-uses of the years of 1980,1995 and 2000 with SWAT(Soil and Water Assessment Tool)model,and then the simulative analyses are made on nine scenarios combined with three climate conditions and three kinds of land-uses,furthermore,the comparisons are made on the changes of the relevant runoff coefficients.The results show that the change of land-use has a certain impact on the runoff yield and confluence of river basin and the impacts from the land-uses on both the amounts of runoff and runoff coefficients are different under the differentprecipitation conditions;in which the amount of runoff and runoff coefficient are more sensitive to the reduction of forest land under the conditions of the near-drought and the near-normal precipitation.