人民长江2015，Vol.46Issue(9)：17-22,6.DOI:10.16232/j.cnki.1001-4179.2015.09.005
长江源区近年水沙变化趋势及成因分析
Runoff and sediment variation trend in source region of Yangtze River in recent years and cause analysis
摘要
Abstract
On the basis of the hydrological and meteorological data in the source region of Yangtze River from 1956 to 2012, the distance average analysis, concentration degree, concentration period, non-uniform coefficient method are adopted to ana-lyze the variation trends of precipitation, runoff, sediment in recent years and the variation causes are studied as well. The results show that from 2005 to 2012, the precipitation, rainy days and the rainfall intensity increases;the precipitation concentration de-gree and the non-uniform coefficient decreases slightly;the runoff increases obviously, and the runoff concentration degree and non-uniform coefficient decreases;the concentration period is delayed, the proportion of dry season runoff in the annual runoff increases. The sediment tends to be uniform within a year, the sediment concentration and discharge shows a significant decrea-sing trend. The causes for the sediment variation include the above-mentioned variation of runoff and the improvement of vegeta-tion cover conditions.关键词
降水/径流/泥沙/变化趋势/长江源区Key words
precipitation/runoff/sediment/variation trends/source region of Yangtze River分类
建筑与水利引用本文复制引用
孙永寿,段水强..长江源区近年水沙变化趋势及成因分析[J].人民长江,2015,46(9):17-22,6.基金项目
国家自然科学基金资助项目(41261004) （41261004）
