PIANC Smart Rivers 2022

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The rule of flow distribution in the diversion region at the head of sandbar of bifurcated reach is studied. The results show that there are diversion point and stagnation point in the diversion region at the head of sandbar in straight-bifurcated reach, and there exists diversion area due to the difference between directions of surface flow and bottom flow in the diversion region at the head of sandbar in meandering-bifurcated reach. The concept of diversion area is put forward through the study. It refers to the curved area along vertical direction calculated according to the diversion ratio of two branches in the local reach of the head of sandbar in diversion region. Natural flow characteristics at the head of typical bifurcated reach in the middle reaches of the Yangtze River are studied based on the concept of diversion area, and the layout principle of regulation project at the head of sandbar in bifurcated reach is put forward, that is, the project at the head of sandbar should be set near the relatively stable diversion area if the diversion ratio of the two branches is not planned to be changed, while the purpose can be achieved by deflecting the starting point of the project to one side if it is made to play the role of changing the diversion ratio of the two branches. The proposal of the concept and calculation method of diversion surface provides a theoretical basis for the design and construction of location of regulation works in bifurcated reach.

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