摘要
三峡大坝蓄水运用以后,直接影响中下游的径流量和输沙量。根据1988-2012年宜昌站、大通站的水文数据,运用相关分析法和Mann-Kendall非参数检验法,对比分析长江流域宜昌站和大通站的径流量和输沙量特性及其在时间和空间上的变化规律。结果表明:宜昌站、大通站年际径流量由于三峡大坝的蓄水存在波动,但未出现明显的趋势性变化;而输沙量从20世纪80年代就开始减少,在2003年三峡大坝建成之后减少的趋势更为明显,三峡大坝对下游水文站点的水沙影响随着与三峡大坝距离的增加而减少,上游宜昌站的水沙变化较下游大通站更为显著。
After impoundment of the Three Gorges Dam , the runoff and sediment discharge of down-stream are directly affected .According to the hydrological data in Datong and Yichang station for 1988 to 2012 year,the paper used correlation analysis method and non-parametric Mann-Kendall test to compara-tively analyzed runoff and sediment discharge characteristics and its variation rule in time and space in Datong and Yichang station of Yangtze River Basin .It was found that due to the water storage fluctua-tions,the annual runoff in Yichang and Datong stations of Three Gorges Dam reservoir , but there do not appear significant trend change;and sediment began to decline from 1980's, the decrease trend of sedi-ment discharge is clear in 2003 after completion of the Three Gorges Dam .The impact of the Three Gorges dam downstream on water and sediment of downstream hydrological stations decreases with the increase of distance away from Three Gorges Dam , the change of water and sand in the upstream of Yichang station is more significant than that in the downstream of Datong station .
出处
《水资源与水工程学报》
2015年第2期139-144,共6页
Journal of Water Resources and Water Engineering
基金
国家重点基础研究发展计划项目(973计划)(2013CB956503)
关键词
径流量
输沙量
水沙关系
长江
三峡工程
runoff
sediment discharge
relationship between water and sediment
the Yangtze River
the Three Gorges Dam
