大凌河流域水库入库水沙变化特性研究OA

In sediment-laden river regions,when large amounts of sediment enter reservoirs,sediment deposition reduces reservoir storage capacity and seriously affects reservoir operation.Taking reservoirs on tributaries in the Daling River Basin as the study objects,this study analyzes variations in inflow runoff and sediment load,as well as the relationship between inflow discharge and sediment transport rate,based on hydrological station water and sediment data.Wavelet variance analysis is then used to examine the periodic variation patterns of runoff and sediment load.The results show that from 2002 to 2023,the interannual runoff of Yanwangbizi Reservoir and Baishi Reservoir exhibited a fluctuating upward trend,and the wavelet variance peak of Baishi Reservoir was significantly higher than that of Yanwangbizi Reservoir.The interannual sediment load of both reservoirs generally decreased gradually,with the variation characteristics of Baishi Reservoir being more pronounced than those of Yanwangbizi Reservoir.For both reservoirs,the annual variation trend of inflow discharge was basically consistent with that of sediment transport rate;the larger the discharge,the stronger the sediment-carrying capacity.