Adjusting Manning coefficients to simulate tsunami propagation over porous coral reef

IF 2.5 3区 工程技术 Q2 MECHANICS European Journal of Mechanics B-fluids Pub Date : 2024-10-02 DOI:10.1016/j.euromechflu.2024.09.006
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Abstract

This study investigates the effect of porous coral reef on the tsunami propagation in terms of experimental and numerical modelling. It aims at quantifying the influence of several input parameters on the wave attenuation and at adjusting Manning coefficients to reproduce experimental results. The density and the surface of individual reefs are fixed as well as the width and length of the coral barrier. Results show that the reef height is the most sensitive parameter. This latter affects the tsunami propagation with an attenuation of the first wave reaching 15 % compared to the case with a smooth reef. Wave breaking occurs on the reef flat for each test but, as expected, its location depends greatly on the reservoir depths difference. Numerical simulations show that the Manning coefficient must be adjusted both by considering the coral reef height and the spatial grid resolution. It varies from 0.01 (for lowest reef with highest grid resolution) to 0.058 (for higher reefs with coarsest grid resolution).
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调整曼宁系数以模拟海啸在多孔珊瑚礁上的传播
本研究从实验和数值模拟两个方面研究了多孔珊瑚礁对海啸传播的影响。研究旨在量化几个输入参数对波浪衰减的影响,并调整曼宁系数以重现实验结果。各个珊瑚礁的密度和表面以及珊瑚屏障的宽度和长度都是固定的。结果表明,珊瑚礁高度是最敏感的参数。后者影响海啸的传播,与光滑珊瑚礁相比,第一波的衰减达到 15%。在每次试验中,破浪都发生在礁石平地上,但正如预期的那样,其位置在很大程度上取决于水库深度差。数值模拟表明,曼宁系数必须根据珊瑚礁高度和空间网格分辨率进行调整。它从 0.01(网格分辨率最高的最低珊瑚礁)到 0.058(网格分辨率最粗的较高珊瑚礁)不等。
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来源期刊
CiteScore
5.90
自引率
3.80%
发文量
127
审稿时长
58 days
期刊介绍: The European Journal of Mechanics - B/Fluids publishes papers in all fields of fluid mechanics. Although investigations in well-established areas are within the scope of the journal, recent developments and innovative ideas are particularly welcome. Theoretical, computational and experimental papers are equally welcome. Mathematical methods, be they deterministic or stochastic, analytical or numerical, will be accepted provided they serve to clarify some identifiable problems in fluid mechanics, and provided the significance of results is explained. Similarly, experimental papers must add physical insight in to the understanding of fluid mechanics.
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