INFLUENCE ON DEPOSITION OF THE THREE GORGES RESERVOIR CAUSED BY THE RESERVOIRS BUILT UPSTREAM.

The reservoirs built in the upper stream of the Yangtze River intercept the sediment from upstream, this will decrease the sediment into the Three Gorges Reservoir (TGR) in downstream and slow down the deposition development of TGR. moreover, this also affect navigation condition for a long-term operation. In this paper, calculations are made about the influence of the deposition and navigation of TGR caused by the reservoirs built in the upper stream of the Yangtze River such as Xiluodu and Xiangjiaba Reservoir by using one-dimensional flow and sediment mathematical model. The results suggest that the deposition development in TGR will be postponed with the reservoirs built upstream. Under the condition of the upstream reservoir built, the sediment deposition would not appear at the fluctuating backwater area in the early operation 40 years. Chongqing reach shows scour tendency, deposition basically not occurring in 100 years. [ABSTRACT FROM AUTHOR]