基于Burn-in和D8法的岩溶区流域边界提取研究

Research on watershed boundary extraction in karst region based on Burn-in method and D8 method

以中国西南岩溶区典型流域——澄碧河流域为研究对象,采用Burn-in法对流域的DEM进行预处理,进而优化流域边界。在此基础上通过径流模拟检验岩溶区流域划分结果的合理性。结果表明,Burn-in法处理后,提取出流域面积为2035.26 km^2(大于处理前的1558.14 km^2),流域验证期月径流模拟的纳什效率系数达到0.83(优于处理前的0.60)。结合研究区的径流模拟结果与流域水系特征,认为Burn-in法处理后的流域划分成果更为合理。

This paper takes Chengbi River Basin,a typical watershed in karst area in southwest China,as the research object,and uses Burn-in method to preprocess DEM of the watershed,thus optimizing the watershed boundary.On this basis,the reasonableness of watershed division in karst region was tested by runoff simulation.The results show that after the Burn-in treatment,the extracted watershed area is 2035.26 km^2(larger than 1558.14 km^2 before treatment),and Nash-Sutcliffe coefficient of monthly runoff simulation in the watershed inspection period is 0.83(better than 0.60 before treatment).According to the runoff simulation results and the characteristics of Basin,it is considered that the results of watershed division processed by Burn-in method are more reasonable.