Possible Influences of the Three-Gorges Reservoir on Evolution of Changjiang River-Bed

After the completion of the three-gorges reservoir, it is inevitable that fluvial processes on the upper river and the lower river of the reservoir will be changed, which causes the evolution of Changjiang river-bed. Firstly, river mouth bars and subaqueous deltas will form because of a high-speed fluvial deposit of tributaries at river mouths where the tributaries flow into the reservoir and its lower reservoir area. Secondly, a series of deformations will occurr in the upper river course near the reservoir and banks along the reservoir after the reservoir retains water, and last tens years. Thirdly, a series of erosions on river-bed and deformations of river course will occurr in the lower river of the reservoir because of unmixed water flows when the reservoir sluices, which will influence seriously on Wuhan city and Jinjiang, a section of Changjiang River from Yichang city to Wuhan city. These processes must be studied and calculated as soon as possible in Hubei province and Chongqing municipality in order that the countermeasures can be made promptly.