利用与GIS相结合的SCS-CN方法估算降雨径流潜力

Estimation of Rainfall Runoff Potential by SCS-CN Method Combined with GIS

有限数据区域的径流预测对于防洪、径流预测和水管理等水文应用来说至关重要。径流曲线法(SCS-CN)是判断特定区域降雨形潜在成径流量常用的有效方法。文章在使用Arc GIS10.2版(地理信息系统软件)和径流曲线法,对中国祁连山南坡降雨形成地表径流量进行了估算。本研究详细阐述了土地利用与土地覆盖变化(LUCC)、水文土壤组、日降雨量等三个因素对区域内所形成径流量的影响。结果表明,地表径流量较小,植被消耗了大部分降雨量。这也说明祁连山的植被覆盖率较高,土壤持水能力较好。

The rainfall prediction of finite data region is important for the hydrological application, such as flood prevention, rainfall prediction and water management. The runoff curve method （SCS-CN） is a commonly used effective method for judging the potential formation of rainfall in a given area. This article uses ArcGIS version 10.2 （geographic information system software） and runoff curve method to estimate the surface runoff from rainfall on the southern slope of Qilian Mountain. This study elaborates in detail the effects of land use and land cover change （LUCC）, hydrological soil groups, and daily rainfall on the formation of runoff in the area. The results show that the surface runoff is not large and most rainfall has been consumed by vegetation, which indicates that Qilian Mountain has high vegetation coverage and good water holding capacity.