水库变动回水区分汊河型转化问题的试验研究

Experimental Study on the Transformation fo the Braided Channel Pattern in the Fluctuating Backwater Zone of the Reservoir

论文在概括有关三峡工程变动回水区研究成果的基础上,通过进一步的概化模型试验,系统地分析了汛期壅水高度、汊道口门迎流条件、过流条件及其河床宽深比等因素对分汊河段水沙运动规律的影响.阐明了变动回水区分汊段向单一河道转化的壅水条件和河床边界条件,并探讨了这类河型转化大致发展方向和判别标准.试验结果与其他类似室内外实测成果符合较好.

By means of the model test of five kinds of boundary conditions, this paper investigates the bed process of the different braided channels and their basic transforming conditions. It has been shown by the study that whether the braided channel transforms into single one mainly depends on the increased height △H of water surface with the same flood discharge and channel boundary conditions. Finally, the possible transforming direction and criterion of the braided channel are discussed.