Preliminary Analyses of Effect of Establishing Sluices at the Three Exits of Jingjiang on Scour-Deposit of the Yangtze and Dongting Lake

In this paper, using one-dimensional mathematic model of suspended load, joint computation is carried out on the scour-deposit variations of the mainstream of the middle and lower Yangtze and the regions of the Dongting Lake. On the basis of the achieved results, the effects of establishing and controlling the sluices on the sour-deposit of the river and lake as well as the three exits' flow dividing and sediment dividing are investigated. The investigated results indicate that after establishing and controlling the sluices, the flow-dividing and sediment-dividing amount through the three exits will decrease, of which the Songzikou will have the most decrease; the effect on the scour-deposit variation of the mainstream's channel will be little; the deposit amount of the Songzikou flow-dividing channel will increase largely, but that in the regions of the Dongting Lake will decrease obviously.