Study on the Effects of Runoff and Sediment Reducing for Ecological Conservation in the Upper Reaches of Beiluohe River Basin
He double cumulative curve method and Mann-Kendall method were used to study the change trend and stage of runoff and sediment of the upper reaches of Beiluohe River form 1980 to 2004. The driving factors for variations of runoff and sediment were analyzed based on the climate characteristics and ecological conservation conditions in each stage. On this basis, the effects of runoff-reducing and sediment-reducing of ecological conservation calculated by the double cumulative curve method, runoff/sediment coefficient method and time series contrasting method. The results show that; (1) the variation of runoff and sediment could be divided into three periods, i. e., 1980 to 1994, 1995 to 2000 and 2001 to 2004. Among them, the effective period of ecological conservation is from 2001 to 2004; (2) the annual average precipitation, annual average erosive precipitation and annual average rainfall erosivity increased 14.0%, 25. 2% and 46. 1% respectively in the period that 1970 to 2000, compared to the reference period that 1980 to 1994. Simultaneity, the annual average observed runoff and annual average sediment reduced 24.325 million mVa and 20.091 million t/a; (3) regardless of climate factor, the total reduction amount of runoff and sediment by ecological conservation are 138.080 million m and 142.508 million t, respectively. The runoff-reducing effect reaches to 31.11% and the sediment-reducing effect get to 65. 14%. The average capacities of control water and soil loss of ecological conservation are about 47,000 m3/(km2 ·a) and 48,000 t/(km2 ·a), respectively.
ecological conservation regulation of runoff and sediment sediment Beiluohe River Loess Plateau
Qin Wei Zhu Qingke Liu Guangquan Zhang Yan
Department of Sedimentation, China Institute of Water Resources and Hydropower Research, Beijing, 10 Key Lab. Of Soil & Water Conservation and Desertification Combating, Ministry of Education, Beijing International Research and Training Center on Erosion and Sedimentation, Beijing, 100044, China
国际会议
郑州
英文
567-579
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）