A quasi-three-phase flow simulation of the interactions between solitary waves and a vertical seawall installed on a sandy beach

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering Pub Date : 2024-09-23 DOI:10.1016/j.coastaleng.2024.104621

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引用次数: 0

Abstract

Local scour and wave loading are two key factors that affect the safety of seawalls under tsunami attacks. In this study, the scouring process at the toe of and wave impact force on a vertical seawall under consecutive solitary wave attacks are simulated using a quasi-three-phase (air, water, and sediment) flow model, which models the air and water as a fluid mixture phase and sediment as a solid phase. The air and water interface is modeled by a VOF method and the sediment–fluid interaction is modeled using the Eulerian two-phase flow method. A comparison between the beach profiles with and without the seawall shows that, with a seawall, a deeper scour hole is generated at the toe of the seawall. Besides, the presence of the seawall causes the eroded sediment to be deposited further offshore. The numerical results are then analyzed in detail regarding the flow field and sediment transport process to reveal the mechanisms of the above eroding/depositing patterns. The wave impact force on the seawall is also analyzed to understand the effect of scouring on the wave loading. It is shown that the wave impact force, despite being stochastic for a specific wave, increases in general with the deepening of the scour hole because the latter increases the exposure of the seawall to wave slamming.

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孤波与安装在沙滩上的垂直海堤之间相互作用的准三相流模拟

局部冲刷和波浪荷载是影响海啸袭击下海堤安全的两个关键因素。本研究采用准三相（空气、水和沉积物）流模型模拟了连续孤波攻击下垂直海堤趾部的冲刷过程和波浪对海堤的冲击力，该模型将空气和水作为流体混合物相，将沉积物作为固相。空气和水的界面采用 VOF 方法建模，沉积物与流体的相互作用采用欧拉两相流方法建模。对有海堤和无海堤的海滩剖面进行比较后发现，有海堤时，海堤趾部产生的冲刷洞更深。此外，海堤的存在会使侵蚀的沉积物沉积到离岸更远的地方。然后对数值结果中的流场和泥沙输运过程进行了详细分析，以揭示上述侵蚀/沉积模式的机理。此外，还分析了波浪对海堤的冲击力，以了解冲刷对波浪载荷的影响。结果表明，尽管波浪冲击力对特定波浪来说是随机的，但总体上会随着冲刷孔的加深而增加，因为后者增加了海堤受波浪冲击的暴露程度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Coastal Engineering 工程技术-工程：大洋

CiteScore

9.20

自引率

13.60%

发文量

审稿时长

3.5 months

期刊介绍： Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.