基于洪水涨冲落淤特性分析游荡性河道双岸整治对冲淤的影响

发布时间：2018-02-21 06:07

  本文关键词： 整治宽度 窄深河槽 涨冲落淤 非恒定洪水输沙 黄河　出处：《泥沙研究》2017年02期 　论文类型：期刊论文

【摘要】：基于黄河下游及主要干支流、美国密苏里河和密西西比河的实测资料,分析了低含沙洪水和高含沙洪水的输沙与冲淤特性。研究表明,河道沿程比降虽然变缓,但河宽变窄,流速沿程增加,是造成冲积河流保持洪水输沙平衡的边界条件。底沙的运动比洪水波传播得慢,是造成洪水在河道中长距离冲刷的根本原因,而与河道的比降陡缓关系不大。河道输沙特性呈现"多来多排",是形成河床沿程冲刷的水流动力条件。通过黄河下游河道双岸整治,河道形成窄深、归顺、稳定的河槽,使洪水造床和输沙作用增强,从而对河道冲刷作用增加。
[Abstract]:Based on the measured data of the lower reaches of the Yellow River and its main tributaries, the Missouri River and the Mississippi River in the United States, the characteristics of sediment transport and siltation of low and high sediment flood are analyzed. The increase of velocity along the course is the boundary condition for the alluvial river to maintain the balance of flood and sediment transport. The movement of bottom sediment is slower than that of flood wave, which is the fundamental cause of flood scouring in middle and long distance. The characteristics of sediment transport in the river show "more coming and more discharge", which is the hydrodynamic condition for the formation of river bed scour. Through the regulation of the two banks of the lower Yellow River, the channel forms a narrow, consistent and stable channel. The effect of flood bed making and sediment transport is enhanced, and the scour effect of river channel is increased.
【作者单位】： 黄河水利委员会黄河水利科学研究院;美国科进柏诚(WSP-PB)工程咨询公司;
【分类号】：TV14;TV85
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本文编号：1521217