大汶河蜿蜒河段的演变分析

Analysis of Evolution of Dawen River Meandering Reach

分析了大汶河蜿蜒性河段的水流特性。从主流平面位置变化(或称水流动力轴线变化)断面平均流速,平均水深和纵向水面比降的变化,弯道环流的变化等三个方面分析了蜿蜒性河段各水力因素在洪、中、枯水时期的变化趋势。从物理角度分析了弯道凹岸的冲刷和坍塌过程。

<Abstrcat> This paper conducts an analysis of the flow characteristic of Dawen River meandering reach, and analyzes the varying tendency of various hydraulic factors of the meandering reach in flood, moderate flow and dry seasons from three aspects, i.e. variation of horizontal position of the main stream (or variation of dynamic axis of flow), variation of mean velocity in section, mean water depth and longitudinal water surface slope, as well as variation of circulating current and river bends, and analyzes the erosion and collapse processes from the angle of physics.