摘要
为研究具有复杂土地情况的山区小流域降雨地表径流,以意大利Trebbia河Gorreto村附近的流域为例,应用ArcGIS技术对流域内部不同的土地利用情况、地表覆盖类型,以及水文土壤群进行了区域划分和各区域CN值计算,再加权计算流域总体CN值,结合流域降雨数据代入径流曲线法(SCS-CN),建立了降雨径流模型估算流域的地表径流量。结果表明:基于ArcGIS准确有效地算出了山区复杂小流域的总体CN值,SCS-CN降雨径流模型显示研究流域的降雨径流转换能力较大。复杂土地状况的山区小流域径流研究应用ArcGIS可获取可靠的流域总体CN参数,以加强SCS-CN降雨径流模型的适用性,具有参考意义。
The watershed near the village of Gorreto on the Trebbia River in Italy is taken as an example to study the surface runoff from rainfall in a small mountain watershed with complex land conditions.The ArcGIS is used to divide the watershed into different areas with various land use conditions,surface cover types,and hydrological soil groups.Then,the CN value of each divided area is calculated by ArcGIS extracted value,and the overall CN value of the whole watershed is obtained by weighting formula.After substituting the rainfall data and the overall CN,the rainfall-runoff model is built by SCS-CN method.The results show that the overall CN value of the complex small mountain watershed is accurately and effectively calculated based on ArcGIS,and the corresponding SCS-CN model indicates that the rainfall-runoff conversion capacity of the studied watershed is relatively large.For research on runoff in small watersheds in mountainous areas with complex land conditions,the application of ArcGIS can work out reliable overall CN parameter for the watershed and improve the applicability of the SCS-CN method,which can be used as a reference for similar researches.
作者
葛怡君
Ge Yijun(Yango University,Fuzhou,Fujian 350015,China)
出处
《绿色科技》
2020年第24期168-170,173,共4页
Journal of Green Science and Technology
