中国水土保持科学2013，Vol.11Issue(1)：39-45,7.
退耕背景下北洛河上游水沙变化分析
Change in runoff and sediment in the upper catchment of Beiluo River under the vegetation restoration
摘要
Abstract
Grain for Green program since 1999 resulted in a great land use/cover changes in the Loess Plateau, China, which fundamentally influenced hydrological cycle and sediment transportation. It is important to understand the impacts of soil and water conservation measures on the streamflow and sediment load in the catchment. The double accumulative curve and Pettit Test method were employed to identify trend and change point in the runoff and sediment in the upper catchment of Beiluo River from 1980 to 2009. Combined with the data of climate change and measures of soil and water conservation, the runoff and sediment process at monthly and yearly scales were analyzed. The result showed that: 1) the change points in 2002 was detected for both runoff and sediment. Compared to period 1 ( 1980-2002) , the volume of runoff and the sediment discharge in period 2(2003-2009 ) decreased by 0. 32 ×108 m3, 0. 29×108 t respectively, and with less fluctuation. 2) At monthly scales, the patterns of monthly rainfall amount and monthly mean volume of runoff in both periods were similar. The relationship between monthly mean volume of runoff and sediment delivery was showed as clockwise 8 , but the varying ratio was different. 3 ) Compared to period 1, the annual average rainfall amount and the annual average rainfall erosivity increased by 10. 06% and 10. 28% . The rainfall has the potential capability of reducing the runoff and the sediment . Regardless of the effect of rainfall, the effect of reducing runoff and sediment by forest and grass measures were about 41% and 81% , respectively.关键词
退耕还林/水沙变化/时间动态/北洛河Key words
Grain for Green program/ change in runoff and sediment/ temporal dynamics/ Beiluo River分类
农业科技引用本文复制引用
刘二佳,张晓萍,谢名礼,陈妮..退耕背景下北洛河上游水沙变化分析[J].中国水土保持科学,2013,11(1):39-45,7.基金项目
国家自然科学基金"北洛河水沙动态过程及对退耕还林(草)响应机理"(41101265) （草）
国家自然科学基金重点项目"气候变化背景下黄土高原土地利用影响径流的空间尺度效应"(41230852) （41230852）
