关键词: 分汊河段, 整治, 长江中下游河段, 演变, 稳定

Abstract: There are 55 bifurcated channel stretches in the 1710km Middle and Lower Yangtze River from Yichang to Xuliujing. They are classified into relatively straight, slightly curved, and goose - head formed bifurcated channels. They have the common characteristics of fluvial evolution with alternatively shifting of their main and secondary channels. Most of them with long period of lying such main - secondary channel alternative shift are of relatively stable fluvial pattern. In the long process of evolution the bifurcated channel stretch as a whole in a state of relative equilibrium possesses the same discharging capacity like upstream or downstream single channel river stretches. The regulation work has to comply with the general principle:“to stabilize bifurcated river regime, to decrease the number of channels, and to rationally utilize central bar and floodplain”， and the exact details of regulation work have to be designed by integrating with the specific river stretch conditions. For the Wuhan river stretch, in accordance with the trend of recent fluvial evolution the adopted alternative of regulation should maintain the double channels on both sides of the islet Tianxingzhou to meet the requirement of the environment protection.