Effect of grain size on local channel scour below a sluice gate
Effect of grain size on local channel scour below a sluice gate
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粒度对闸门下方局部河道冲刷的影响
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
K. Hagel
中科院分区：
文献类型：
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作者：
J. Kells;R. Balachandar;K. Hagel
在本研究中，粒径对局部冲刷过程动力学的影响是在淹没水闸下游发生侵蚀的背景下讨论的。在不同尾水深度和流量条件下，采用4种不同级配的非粘性床料研究了冲刷过程。砂级配包括三种尺寸的均匀级配砂和第四种尺寸，这是由三种均匀砂按重量等比混合而成的。总共进行了36次试验，每次试验的时间为24小时。在这段时间内，任何一次试验都没有达到平衡冲刷条件，尽管在靠近闸门的区域观察到河床剖面的相似性。结果表明，冲刷深度和冲刷面积与床层粒度密切相关，随粒度的减小而增大。此外，还发现混合砂床（即分级砂床）的试验结果比混合砂床的试验结果更少。
In this study, the effect of grain size on the dynamics of local scour processes is discussed in the context of the erosion that takes place downstream from a submerged sluice gate. Four gradations of non-cohesive bed material were used to study the scour process for various tailwater depth and flow rate conditions. The sand gradations included three sizes of uniformly graded sand and a fourth size, which was obtained by mixing the three uniform sands in equal proportions by weight. A total of 36 tests was carried out, each for a period of 24 h. An equilibrium scour condition was not attained over this time period for any of the tests, although a sense of similarity in the bed profiles is observed in the region close to the sluice gate. The present results indicate that the depth and the area of scour are highly dependent on the bed grain size, both increasing as the grain size is reduced. As well, it was found that the tests with a mixed (i.e., graded) sand bed resulted in less scour relative to those in...