An Experimental Study of Characteristics of Solitary-Wave-Induced Scour Around a Pile Breakwater with a Discussion on Effects of the Distance Between Piles
An Experimental Study of Characteristics of Solitary-Wave-Induced Scour Around a Pile Breakwater with a Discussion on Effects of the Distance Between Piles
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DOI：
10.1142/s1793431122400024
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发表时间：
2022-05
影响因子：
1.5
通讯作者：
Conghao Xu;Zhenhua Huang
中科院分区：
文献类型：
--
作者：
Conghao Xu;Zhenhua Huang
了解海啸引起的桩式防波堤的冲刷对这种类型的海防结构的基础安全是重要的。采用[公式：见正文]为间隙差距尺寸，[公式：见正文]为桩径的波浪水槽试验，研究了孤立波作用下桩周防波堤局部冲刷的特征，包括冲刷孔深度、冲刷孔长度、淤积沙坝高度和冲刷量。结果表明，射流通过桩间缝隙，引起桩周局部冲刷。冲刷后期，在桩式防波堤的下浪侧出现了一个二维的淤积沙坝。引入一个新的经验方程来近似描述一系列孤立波作用下的冲刷坑深度的演化。通过文献中报告的[公式：见正文]现有数据和本研究中报告的新数据验证了该公式。通过对[公式：见正文]和0.39的计算结果进行比较，讨论了桩间距对局部冲刷特性的影响。比较显示，[公式：见文字]的冲坑深度和沙洲高度均明显大于[公式：见文字]的相应值。
Understanding tsunami-induced scour at a pile breakwater is important for the foundation safety of this type of coastal defense structures. A series of wave-flume tests were performed for [Formula: see text], with [Formula: see text] being the gap size and [Formula: see text] the pile diameter, to study the characteristics of the solitary-wave-induced local scour around a pile breakwater, including the scour-hole depth, scour-hole length, deposition sandbar height and the scoured volume. It was found that the jet flow through the gaps between piles caused the local scour around individual piles. A more or less two-dimensional deposition sandbar was found on the down-wave side of the pile breakwater in the later stage of the scour process. A new empirical equation was introduced to approximate the evolution of the depth of the scour hole induced by a series of solitary waves. The equation was verified by existing data reported in the literature for [Formula: see text] and the new data reported in this study. Effects of the distance between piles on the characteristics of the local scour were discussed by comparing the results for [Formula: see text] and 0.39. The comparison showed that the scour-hole depth and height of the sandbar for [Formula: see text] were all noticeably larger than the corresponding values for [Formula: see text].