三峡工程蓄水前后进出库水沙特性及径流量时间序列变化周期分析

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:...

Analysis of Three Gorges Reservoir Water-sediment and the Period of Change of Temporal Series of Annual Runoff

According to hydrologic and sediment observation data, the flow and sediment features flowing into and out of Three Gorges reservoir are analyzed systematically. Selecting the representative hydrolagical stations located in the upper reaches of the Yangtze River, including mainstream and its tributaries, a comparative analysis on the changes of the annual runoff, the annual sediment yield, the annual average sediment concentration, et al of each station before and after the years of the Three Gorges Project starting water storage is conducted in this paper. In addition, based on the multi-resolution function of wavelet analysis, from the multi-time scale point, this paper analyzes the time series of annual runoff data from 1950 to 2008 of Zhutuo, Cuntan and Yichang station. The results indicate 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, presented 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.