Comparative study of typical input flow and sediment sequences of the Three Gorges Reservoir
The selection of input flow and sediment sequence runs through every stage from planning to operation of the Three Gorges Reservoir(TGR),which directly determines the reservoir scale,construction period,operation mode and optimal scheduling direction.Based on the measured data of 1961-1970 sequence(60 s sequence),1991-2000 sequence(90 s sequence)and 2011-2020 sequence(10 s sequence),the input flow-sediment characteristics and development trend of above sequences are comparative analyzed.The results show that with the progression of sequences,the polarization of annual water volumes tends to increase,and the dispersion degree of annual sediment volumes tends to decrease.There is no significant difference in the inflow volume in the maximum flood year of each sequence.However,the magnitude of the incoming sediment in the 90 s sequence and 60 s sequence is basically equivalent,and the sediment in 10 s sequence is lower than that in the driest year of 90 s sequence.The sources of incoming water and sediment in 60 s and 10 s sequences are similar,while the proportion of incoming sediment from Jialing River in 90 s sequence is decreased significantly.During the main flood season,the months with a large amount of incoming sediment tend to be concentrated with the proportion of incoming sediment to the whole year tending to increase.
Three Gorges Reservoirincoming flow and sedimentsource of flow and sedimenttypical se-quence
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