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SCS模型考虑了径流与土壤特性和土地利用的关系,能反映不同土壤和地面覆盖条件影响产流的特点,所需参数较少,是一种简洁且实用的流域径流计算方法。基于小流域DEM和遥感资料,利用GIS划分流域子单元,以甘肃南部嘴子沟流域为例,选取不同时段不同降水量,应用SCS产流模型对小流域降雨-径流过程进行模拟计算,得出径流深和径流量分布图;利用GIS技术实现径流数据与空间数据相结合,为模拟、评价及预测小流域泥石流的危险范围提供了技术支撑。
The SCS model considers the relationship between runoff and soil properties and land use, reflects the characteristics of different soil and ground cover conditions affecting runoff, and requires less parameters. It is a simple and practical method for calculating runoff. Based on the DEM and remote sensing data of watershed, the watershed subunits are divided by GIS. Taking the Zhuizougou watershed in the southern Gansu Province for example, different rainfalls in different periods are selected. The SCS runoff model is used to simulate the rainfall-runoff processes in small watershed. Depth and runoff distribution. The combination of runoff data and spatial data by using GIS technology provides technical support for simulating, evaluating and predicting the dangerous scope of debris flow in small watershed.