Characteristics of flow and sediment during autumn flood season and its impact on erosion and deposition in Three Gorges Reservoir
The autumn flood occurring in the upper reach of the Yangtze River is an important flow-sediment e-vent,which has a direct influence on the processes of erosion and deposition in Three Gorges Reservoir(TGR).Based on the measured data from 1954 to 2022,the characteristics of flow and sediment during the autumn flood season and its impacts in TGR are analyzed.The results show that there has been little change of input annual runoff during the autumn flood season in the upper reach of the Yangtze River in the past 70 years.However,the annual average input sediment has decreased by 87％since 2013.It is also found that more than 70％of the sediment comes from the Jialing River during the autumn flood,which indirectly affects the flow and sediment conditions in the TGR.Compared with the flood season,more than 90％of the sediment of autumn flood is deposited in the TGR,and the sedimentation in the upstream section of Cuntan,which is the tail of the reservoir,is more prominent.According to the operation of TGR during the autumn flood season in 2014,increasing the discharge flow in a timely manner can significantly improve the sediment discharge capacity and reduce the deposition in the reservoir.The research results are of great significance for deepening the under-standing of the sedimentation characteristics of TGR and optimizing the reservoir operation during autumn flood.
the upper reach of Yangtze RiverThree Gorges Reservoirautumn floodsediment depositionres-ervoir regulation
万方数据
维普
