Analytical and numerical investigation on the effects of landslide acceleration in landslide-generated tsunamis

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Mechanics Pub Date : 2023-01-01 DOI:10.1093/jom/ufad025

Peter H-Y Lo, I-Chi Chan

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引用次数: 0

Abstract

Abstract Submarine landslides are capable of causing locally catastrophic tsunamis. A landslide necessarily begins its motion by accelerating from a halt. However, the role of landslide acceleration on the tsunami generated by a landslide remains understudied. Assuming an idealized configuration, in this study we cast the landslide acceleration problem as an extension to the existing knowledge on landslide-generated tsunamis above a flat sea bottom. By using the Green’s function approach, we derived new analytical solutions for the tsunami generated by an accelerating submarine landslide. Consistent with the observations in existing studies, we found that a slower landslide acceleration results in a longer but smaller leading submarine landslide tsunami wave. Based on a large number of numerical simulations, empirical formulas were established to quantify the wave modification factors due to landslide acceleration. Combining existing analytical solutions and the newly determined empirical formulas, we assembled semi-analytical solutions that can be easily used to predict the characteristics of the tsunami generated by an accelerating submarine landslide.

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滑坡引发海啸中滑坡加速效应的分析与数值研究

海底滑坡能够引起局部灾难性的海啸。山体滑坡的运动必然是从静止加速开始的。然而，滑坡加速对滑坡引发的海啸的作用仍未得到充分研究。在本研究中，假设一个理想的配置，我们将滑坡加速问题作为对平坦海底以上滑坡引发的海啸的现有知识的扩展。通过使用格林函数方法，我们为加速海底滑坡产生的海啸导出了新的解析解。与已有研究的观测结果一致，我们发现滑坡加速度越慢，海底滑坡海啸波越长，但越小。在大量数值模拟的基础上，建立了量化滑坡加速度对波浪修正因子的经验公式。结合现有的解析解和新确定的经验公式，我们组装了半解析解，可以很容易地用于预测加速海底滑坡产生的海啸的特征。

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

Journal of Mechanics 物理-力学

CiteScore

3.20

自引率

11.80%

发文量

审稿时长

6 months

期刊介绍： The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.