Numerical Simulation of Run-Up and Land Inundation on the Vegetated Sloping Beach

IF 2.1 4区工程技术 Q2 GEOCHEMISTRY & GEOPHYSICS

Journal of Earthquake and Tsunami Pub Date : 2021-04-12 DOI:10.1142/S1793431121500275

Maryam Ziaadini-Dashtekhaki, M. Ghaeini-Hessaroeyeh, S. Hamzehei-Javaran

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引用次数: 1

Abstract

Vegetated areas on the beach can reduce tsunami heights and reduce the loss of life and property damage in coasts. Thick trunks and tangled branches attenuate tsunami waves. In this study, a numerical model is developed based on the finite volume method for simulating tsunami flooding. This model is used to simulate the solitary wave run-up propagation on sloping beaches with and without vegetation. The shallow water equations are used, also the effect of drag force due to vegetation is applied in the momentum equation. The HLLC approximate Riemann solver is selected, and the model is developed to second-order accuracy using the Weighted Average Flux method. After verification of the present model, the model is applied for simulation of solitary wave on a sloping beach. The present model results are compared to the available experimental data and another numerical model. The present numerical results reveal that as forest belt’s width increases, the height, velocity, and force of the tsunami waves decrease. Therefore, to further reduce the tsunami energy, a wider belt is recommended. Also, the effect of different tsunami wave heights on the rate of wave reduction has been investigated. In some areas, the presence of high tsunami waves causes to submerge the vegetation. Consequently, the drag force and the damping rate of the wave decrease. Therefore, the height of the forest zone and the height of the tsunami waves are important parameters.

查看原文本刊更多论文

植被坡地滩涂坡度与土地淹没的数值模拟

海滩上的植被区域可以降低海啸的高度，减少沿海地区的生命和财产损失。粗壮的树干和纠结的树枝可以减弱海啸的影响。本文基于有限体积法建立了模拟海啸洪水的数值模型。该模型用于模拟有植被和无植被的斜坡海滩上孤立波的上升传播。采用浅水方程，并在动量方程中考虑了植被拖曳力的影响。选择HLLC近似Riemann求解器，采用加权平均通量法将模型发展到二阶精度。通过对模型的验证，将该模型应用于坡滩孤立波的模拟。将模型结果与已有的实验数据和另一个数值模型进行了比较。目前的数值结果表明，随着林带宽度的增加，海啸波的高度、速度和力都减小。因此，为了进一步降低海啸能量，建议采用更宽的带。此外，还研究了不同海啸波高对消波率的影响。在一些地区，高海啸波的存在导致植被被淹没。因此，波浪的阻力和阻尼率减小。因此，森林带的高度和海啸波的高度是重要的参数。

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 Earthquake and Tsunami 地学-地球化学与地球物理

CiteScore

2.60

自引率

13.30%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Earthquake and Tsunami provides a common forum for scientists and engineers working in the areas of earthquakes and tsunamis to communicate and interact with one another and thereby enhance the opportunities for such cross-fertilization of ideas. The Journal publishes original papers pertaining to state-of-the-art research and development in Geological and Seismological Setting; Ground Motion, Site and Building Response; Tsunami Generation, Propagation, Damage and Mitigation, as well as Education and Risk Management following an earthquake or a tsunami. We welcome papers in the following categories: Geological and Seismological Aspects Tectonics: (Geology - earth processes) Fault processes and earthquake generation: seismology (earthquake processes) Earthquake wave propagation: geophysics Remote sensing Earthquake Engineering Geotechnical hazards and response Effects on buildings and structures Risk analysis and management Retrofitting and remediation Education and awareness Material Behaviour Soil Reinforced concrete Steel Tsunamis Tsunamigenic sources Tsunami propagation: Physical oceanography Run-up and damage: wave hydraulics.