【摘要】 SCS模型是一个只需查与前期降雨量、土壤类型和土地利用方式相关的参数CN(CurveNumber),就可计算径流量的模型。但是地区间CN值差别很大,很难获得适合本地区的CN值。利用定西安家沟流域小区1986～1988年的降雨径流观测数据反算CN,然后在统计软件SPSS下利用逐步回归和曲线模拟函数模拟CN与降雨量、前5天降雨量和坡度的关系,最后得出不同土地利用方式下CN与上述三个因素的关系,并得出相应的模拟曲线。利用1989年的降雨径流时间对模拟结果进行检验,证明得到了较好的结果。更多还原

【Abstract】 The model of SCS is a simple model that needs a parameter CN (Curve Number) that just relates to soil types, landuse types and prerainfall. But it Seldom used because the CN in different areas is much different and it is not convenient to get the value of CN which fits to the particular area. The observational data about rainfall and runoff from 1986 to 1988 to model the relationship between CN and API (the total rainfall in the five days before the rainfallrunoff event’s occurrence), slope, and rainfall are employed and the results show that CN under different landuse types strongly relate to rainfall, does not relate to slope and API. Then, chose API and rainfall to model CN using stepwise regression under SPSS, and the output of statistic eliminate the API. Last, Use the Quadratic function and Cubic function to model the CN and Rs is above 98%. The results employing rainfall runoff observational data in 1989 to check the model is credible. 更多还原