基于改进适度指数法的流域流水网阈值确定研究

Identification of Critical Contributing Area Based on Improved Fitness Index Method

针对集水面积阈值为提取河网的关键参数,提出了采用改进的适度指数法确定理想的集水面积阈值,并与常用的河网密度法进行了比较,以多营坪流域为例完成了河网水系提取分析。结果表明,该方法提取的水系与蓝线水系拟合精度较好,优于河网密度法提取的水系。

The critical contributing area is a critical parameter for extracting drainage networks.This paper applies the improved fitness index methods to identify the critical contributing area and compares with drainage network density method.And then the method is used to extract the channel network of Duoyingping watershed.The results show that the improved fitness index methods is reasonably close to the reality,which is superior to drainage network density method.