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首页> 外文会议>International Conference on Fluvial Hydraulics Vol.2, Sep 4-6, 2002, Louvain-LA-Neuve, Belgium >Influence of bars in river channels with bifurcation and convergence
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Influence of bars in river channels with bifurcation and convergence

机译：分岔与收敛对河道中条形的影响

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摘要

In recent years the circumstances surrounding river sciences have been greatly changing. It is noted that a river not only safely discharges water particularly at the time of flood, but it plays an important role in creating an environment that is beneficial to people and a larger ecosystem. Therefore, new attempts to restore modified rivers to their original, natural forms are underway. In this study, restoration of a river that had been straightened to its original meandering course was conducted in simulation. To obtain basic data for understanding the flow regime and behavior of sandbars at the completion of restoration works, a model experiment was carried out. The experimental results suggest that in the case of a two-waterway construction in which straight and meandering channels run parallel, the phase difference of sandbars in the straight channel greatly affects the flow of the meandering channel. After letting water flow through the meandering channel for a considerable number of hours, sedimentation took place, and the channel filled up with sediment. To cope with this situation, we attempted to install a weir in the immediate downstream of the diversion of two-waterway that would successfully divert water flow to the meandering channel. Some issues still remain regarding the installation of the weir, but nevertheless the resulting channel condition was similar to that of the case of an exclusive meandering channel without a parallel straight channel.
机译：近年来，围绕河流科学的情况发生了巨大变化。值得注意的是，河流不仅安全地排放水，尤其是在洪水发生时，而且在创造有利于人类和更大生态系统的环境中发挥着重要作用。因此，正在进行将经过修改的河流恢复为其原始自然形态的新尝试。在这项研究中，通过模拟对河道进行了修复，该河道已被拉直至其原始曲折路线。为了获得基本数据，以了解恢复工作完成后沙洲的流态和行为，进行了模型实验。实验结果表明，在直水道和曲流河道平行运行的两水道施工中，直河道中沙洲的相位差极大地影响了曲流河道的流量。在让水流过蜿蜒的河道数小时之后，发生了沉淀，并且河道中充满了沉积物。为了应对这种情况，我们试图在两水道分流的下游直接安装一个堰，以成功地将水分流到蜿蜒的河道。关于堰的安装仍然存在一些问题，但是尽管如此，所产生的通道状况与不具有平行直通道的排他曲折通道的情况类似。

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