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首页> 外文期刊>International journal of hydrology science and technology >Performance evaluation of horizontal sharp crested weirs in a channel bend
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Performance evaluation of horizontal sharp crested weirs in a channel bend

机译：弯道中水平尖顶堰的性能评估

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摘要

In some cases, construction of weirs and diversion structures in river bends is inevitable. There are a number of such hydraulic structures which were installed around the river bend without considering the undesirable effects of these structures on the river morphology which resulted in serious problems like that of erosion, sedimentation and non-symmetrical distribution of flow where water intakes are required on both sides of the river banks. The main hypothesis for uniform flow distribution across the bend and along the weir crest is changing the weir crest profile from horizontal to sloping. Most of times, this criterion is neglected. In this study, performance of horizontal sharp crested weirs in a 90-degree bend channel is discussed. An experimental set up was prepared in which channel width was taken as 1 m with a 9 m straight reach on the upstream with a depth of 60 cm. The results show the non-uniform flow distribution along the bend with non-symmetric distribution of water depth across channel width. Since at present there is no criterion for location of control section in the bend, this study presents new criteria for suitable place of control section of sharp crested weirs in the bendway. It was found that the control section of sharp crested weir in the bendway lies in the range of 2.6 to 3.0 times of h_(max·) It was also found that the direction of control section is not parallel to weir in the bendway.
机译：在某些情况下，在河弯处建造堰和引水结构是不可避免的。在河弯周围安装了许多这样的水工结构，但没有考虑到这些结构对河流形态的不利影响，这会导致严重的问题，例如需要进水口的侵蚀，沉积和流量的不对称分布在河两岸。整个弯头和沿堰顶均匀流动分布的主要假设是将堰顶轮廓从水平改变为倾斜。在大多数情况下，此标准被忽略。在这项研究中，讨论了在90度弯曲通道中水平尖顶堰的性能。准备了一个实验装置，其中通道宽度取为1 m，上游直进距离为9 m，深度为60 cm。结果表明，沿弯道的流量分布不均匀，整个通道宽度上水深分布不对称。由于目前尚无弯道控制段位置的判据，本研究提出了弯道上尖顶堰的控制段合适位置的新判据。结果发现，弯道中尖顶堰的控制段在h_（max·）的2.6至3.0倍的范围内。此外，还发现控制段的方向与弯道中的堰不平行。

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