中国水土保持科学2011，Vol.9Issue(6)：57-64,8.
自动基流分割法在黄土高原水蚀风蚀交错区典型流域适用性分析
Suitability analysis of automatic baseflow separation methods in typical watersheds of water-wind erosion crisscross region on the Loess Plateau, China
摘要
Abstract
The water-wind erosion crisscross region on the Loess Plateau is the main source of the coarse sediments of the Yellow River, where eco-environment is very fragile. The baseflow is of great significance to maintain sustainable development of the river ecosystem in this region. In order to test the applicability of automated baseflow separation methods on the water-wind erosion crisscross region on the Loess Plateau, several commonly and widely used methods including minimum smoothing method, HYSEP and recursive digital filter were tested by the runoff data of Kuyehe Watershed. The results show that there were significant difference of baseflow indices of eight methods with the maximum 0. 651 5 andminimum 0. 330 5. The statistical characteristics of annual baseflow indices that were used Chapman-Maxwell filtering method and Eckhardt filtering method to estimate are the best with the mean values 0. 386 8 and 0. 330 5 , respectively, and the standard deviation 0. 042 8 and 0. 046 1, respectively. The baseflow discharge curves are smooth, which accords with realistic base flow condition. The verification results show that Nash-Sutcliffe efficiency coefficients were 0.691 and 0.718, respectively, and the average relative errors were 9.83% and 5.05%, respectively. Therefore Chapman-Maxwell filtering method and Eckhardt filtering method separate most objective and stable base flow, which could be used as optimal base flow separation method in this study area. The mean baseflow estimated by Chapman-Maxwell filtering method and Eckhardt filtering method showed a significant negative trend in the near 50 years and the reduction of baseflow account for 41% of the total runoff.关键词
基流分割/数字滤波法/适宜性/水蚀风蚀交错区/黄土高原Key words
baseflow separation/ recursive digital filter/ suitability/ water-wind erosion crisscross region/ the Loess Plateau引用本文复制引用
雷泳南,张晓萍,张建军,刘二佳,张庆印,陈妮..自动基流分割法在黄土高原水蚀风蚀交错区典型流域适用性分析[J].中国水土保持科学,2011,9(6):57-64,8.基金项目
国家重点基础研究发展计划(973)项目"中国主要水蚀区土壤侵蚀过程与调控研究"(2007CB407203) （973）
国家重点实验室专项经费"水蚀风蚀交错区侵蚀环境演变的地学一生物学过程及其调控"(10502-Z12-1) （10502-Z12-1）
