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EXPERIMENTAL INVESTIGATION OF CHANNEL RESPONSES AGAINST DIFFERENT CONFIGURATIONS OF GROYNES

机译:通道对不同构型的反应的实验研究

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摘要

Both massive bank erosion at monsoon and lack of navigable depth at dry season are the crucial problems in Jamuna River of Bangladesh. Groynes are commonly practiced to mitigate the problems, but the suitable designs yet to be found: completely blocked impermeable groynes suffer from structural instability, and so on; whereas, fully permeable structure can not establish thalweg for navigation. A modified combined groyne is designed optimizing both alignment and permeability to improve the groyne functions, and is tested including three other models. A groyne is evaluated through three features: scour near groynes (structure stability), deposition in the groyne field (bank stability), and erosion in the main channel (navigability). Experimental data shows that the modified combined groyne decelerates the flow gradually towards the channel wall and minimizes local scour compared with other structures. Other two features are also relatively regular in the channel, but moderate in magnitude.
机译:季风造成的大量河岸侵蚀和旱季缺乏通航深度都是孟加拉国贾木纳河的关键问题。通常使用防漏罩来减轻这些问题,但是尚未找到合适的设计:完全封闭的不可渗透防漏罩遭受结构不稳定性的困扰,等等。然而,完全可渗透的结构无法建立海底航行系统。设计了一种改进的组合式防波堤,优化了对准和渗透性,以改善防波堤功能,并进行了包括三个其他模型的测试。通过三个特征来评估堤坝:在堤坝附近冲刷(结构稳定性),在堤坝场中沉积(堤岸稳定性)和在主要通道中侵蚀(通航性)。实验数据表明,与其他结构相比,改良的组合式防波堤逐渐降低了流向通道壁的速度,并使局部冲刷最小化。通道中的其他两个特征也相对规则,但幅度适中。

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