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Erosion and sedimentation patterns associated with restoration structures of bendway weirs
Journal of Hydro-environment Research ( IF 2.4 ) Pub Date : 2018-11-13 , DOI: 10.1016/j.jher.2018.11.001
Mohammad Hemmati , Pejman Daraby

Bendway weirs (B.W.), known as new and innovative river training structures, are positioned from the outer bank of the river bend and angled upstream toward the flow. In order to investigate the effect of bendway weirs on the sediment process, experiments were conducted in a 90° bend with a relative curvature of 3.3 with and without bendway weirs. Following the installation of bendway weirs with different crest slopes, the scour and sedimentation patterns were evaluated under clear water conditions. To this end, a series of B.W. (7 weirs) with three crest slopes (0, 5, and 10 percent) were installed at the outer bank side in different hydraulic conditions. Erodible bed topography measurements revealed that the maximum scour depth occurred at the tip of the first and last weirs. Moreover, the findings of this study clearly demonstrates the potential of bendway weirs in modifying morphology of river bends and their efficiency in reducing erosion and sedimentation. In general, compared to non-weirs condition, the eroded sediment volume increased by 53, 36, and 15 percent due to the installation of weirs with crest slopes of 0, 5, and 10 percent, respectively. Finally, this study revealed that the maximum scour depth decreased with an increase in the crest slope.



中文翻译:

与弯道堰恢复结构有关的侵蚀和沉积模式

Bendway堰(BW),被称为新型的创新河道训练结构,位于河道的外围,并向上游倾斜。为了研究弯道堰对沉积过程的影响,在有和没有弯道堰的情况下,在相对弯曲度为3.3的90°弯道中进行了实验。在安装了具有不同波峰坡度的弯道堰之后,在清澈的水条件下评估了冲刷和沉积模式。为此,在不同的水力条件下,在外岸侧安装了一系列带有三个波峰斜率(0%,5%和10%)的BW(7个堰)。可侵蚀的床面地形测量表明,最大冲刷深度发生在第一个和最后一个堰的尖端。此外,这项研究的结果清楚地表明了弯道堰在改变河弯形态及其减少侵蚀和沉积效率方面的潜力。通常,与非堰状条件相比,由于安装了堰顶坡度分别为0%,5%和10%的堰,侵蚀的泥沙量增加了53%,36%和15%。最后,这项研究表明最大冲刷深度随波峰斜率的增加而减小。

更新日期:2018-11-13
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