摘要
选取长江上游干、支流主要水文站为代表站,根据水文泥沙观测资料,对三峡水库进出库水沙特性进行了较为系统的分析,对比分析各站三峡工程蓄水前后年径流量、年输沙量、年均含沙量等水沙特征值的变化特性。另外,运用小波分析的多分辨率功能,对朱沱、寸滩和宜昌站1950～2008年年径流量时间序列资料进行了多时间尺度分析。分析结果表明:三峡水库蓄水运用后,入库水量与多年平均值比变化不大,但来沙量明显偏少;在过去50多年的时间内,长江上游干流河段年径流量时间序列比较一致地以12年为主周期进行丰、枯变化,目前,长江上游来水仍处于相对偏枯的年份。
According to hydrologic and sediment observation data,the flow and sediment features flowing into and out of Three Gorges Reservoir were analyzed systematically.By selecting representative hydrolagical stations located in the upper reaches of the Yangtze River,including mainstream and its tributaries,a comparative analysis on its changes of annual runoff,annual sediment yield,and annual average sediment concentration before and after the years of the Three Gorges Project starting water storage was conducted.In addition,based on the multi-resolution function of wavelet analysis,from the multi-time scale point,the time series of annual runoff data from 1950 to 2008 of Zhutuo,Cuntan and Yichang station was analyzed.The results indicated that the ratio of reservoir inflow volume to the multi-year average discharge changes little after the Three Gorges Project storing water,but the sediment concentration is significantly less than normal.In the past 50 years,the annual runoff time series of the upper reaches of the Yangtze River periodically varies,presenting as a cycle of abundance-low-abundance,and the dominant period is 12-year.At present,the incoming runoff of the upper reaches of the Yangtze River lies at a relative low status.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2011年第1期58-63,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
水利部公益性行业专项经费项目(200901003)
中央级公益性科研院所基本科研业务费资助项目(YWF09029)
关键词
三峡工程
水沙变化特性
时间序列
小波分析
Three Gorges Project
flow-sediment variation
time series
wavelet analysis
