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This paper analyzes the characteristics of the flood land change at the branching reach with bend after water storage of Three Gorges of Yangtze River, and demonstrates in combination with numerous engineering practice researches that the treatment measures regarding the branching reach with bend at the middle reaches after water storage of Three Gorges are significantly different from the traditional treatment measures, and puts forward reasonable theoretical supports for such treatment measures after discussion, so as to realize the increase of channel dimension via controlled floodland. 1. Characteristics of the changes of the branching reach with bend at the middle Yangtze River after water storage of Three Gorges There are various river patterns distributed in the middle reaches of Yangtze River. Among others, the river patter of branching reach with bend exists in an extensive range. Such rivers are normally larger in river width, with the local main stream at the branching reach liable to shift, and relatively weak characteristics of the water flow movement, which leads to the tendency of the formation of various floodlands; in the meantime, there are certain limitations to the river width, as a result, despite the existence of various floodlands, such floodlands exist mostly in form of point bars or central bars rather than grow high. Normally, point bars are attached to one bank, usually located in areas of slack water, and distributed on the river channel side or the convex bank of the bend at the straight branching reach, with close or semi-isolated connection between the floodland and the river bank, such as Nianziwan point bar, Chaimatou point bar, Yanggouzi point bar and so on; central bars are relatively independent underwater disposition bodies, some of which are relatively stable while others are not; stable central bars are normally located in non-mainstream area, low and gentle and relatively complete, while the central bars located in the mainstream fluctuating area with greater water flow changes of floods and droughts are normally unstable, such as Ouchikou central bar and so on. According to the statistics, the shallow rate of the branching reach with bend with width of 1500m~2500m at the middle reaches of Yangtze River after water storage of Three Gorges increases significantly, compared with that before water storage, which is mainly because that the existing low floodlands of the original waterway at such reach is prone to undergo scour under the circumstance that the water duration increases greatly while the coming sediment decreases significantly after water storage of Three Gorges; the floodland restoration capability of the floodland after it is reduced to the floodland and the reach after scour presents a significant development tendency of widening and shallowing,thus the situation of worse channel conditions appears. 159 2016 International Conference on Engineering and Advanced Technology (ICEAT-16) Advances in Engineering Research (AER), volume 82

Mechanism Research on Treatment Measures Regarding the Branching Reach with Bend at the Middle and Lower Yangtze River after Water Storage of Three Gorges Reservoir