Numerical modelling of pump-driven tsunami generation and fluid-structure-interaction in idealized urbanized coastal areas during run-up

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering Pub Date : 2024-11-12 DOI:10.1016/j.coastaleng.2024.104654

Felix Spröer , León-Carlos Dempwolff , Christian Windt , Clemens Krautwald , David Schürenkamp , Nils Goseberg

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引用次数: 0

Abstract

Tsunami wave inundations are still one of the most devastating natural disasters worldwide. Tsunamis striking a settlement frequently devastate much of its infrastructure. In instances where infrastructure withstands the tsunami’s actions, it acts as a flow resistance for the wave’s run-up, altering inundation dynamics and flow depth. Accurately predicting the complex dynamics of tsunami wave run-up in densely populated urban areas is paramount for informing effective evacuation protocols and conducting comprehensive hazard and risk assessments. In pursuit of improving wave run-up prediction capabilities, this study delves into the three-dimensional numerical modelling of wave run-up of non-breaking, long tsunami waves in urbanized areas. Leveraging insights from a physical experiment with pump-driven wave generation and idealized infrastructure, a novel pressure-based wave generation boundary condition is developed. The boundary condition achieves an average of 4.9% accuracy in replicating the water surface elevation from experiments. Additionally, it attains an average 1.5% precision in reproducing flow velocities, furthermore reproducing the spatial flow dynamics accurately. Physical experiment wave run-up is modelled with an average 6.9% deviation for both simulations with and without idealized infrastructure. 63.0% higher non-linearity waves than in the physical experiments are additionally investigated to highlight the boundary conditions capabilities of high non-linearity wave generation, change in run-up reduction for higher non-linearity waves for infrastructure interaction and furthermore in-depth flow field characteristics during tsunami inundation. Finally, the study highlights deviations from analytically calculated wave run-up, emphasizing the necessity for numerical and physical experimental evaluation for both high non-linearity waves and tsunami infrastructure interaction, ultimately fostering both resilience and preparedness against tsunami hazards.

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理想化城市化沿海地区海啸上升过程中泵驱动海啸生成和流体-结构相互作用的数值模拟

海啸波淹没仍然是全世界最具破坏性的自然灾害之一。海啸袭击一个居民点，往往会摧毁其大部分基础设施。在基础设施经受住海啸冲击的情况下，它们会成为海浪上升的阻力，改变淹没动态和水流深度。准确预测人口稠密的城市地区海啸波浪上升的复杂动态，对于制定有效的疏散方案和进行全面的危害和风险评估至关重要。为了提高海浪上升的预测能力，本研究深入研究了城市化地区非断裂长海啸海浪上升的三维数值建模。利用从泵驱动造浪和理想化基础设施的物理实验中获得的启示，开发了一种基于压力的新型造浪边界条件。该边界条件在复制实验中的水面高程方面平均达到了 4.9% 的精确度。此外，它在再现水流速度方面的精度平均达到 1.5%，而且还能准确再现空间水流动态。在有理想化基础设施和没有理想化基础设施的模拟中，物理实验波浪上升模拟的平均偏差为 6.9%。此外，还研究了比物理实验中高 63.0% 的非线性波，以突出高非线性波产生的边界条件能力、基础设施相互作用时较高非线性波的径流减少变化，以及海啸淹没期间的深度流场特征。最后，研究强调了与分析计算波浪上升的偏差，强调了对高非线性波浪和海啸基础设施相互作用进行数值和物理实验评估的必要性，最终促进抵御海啸灾害的能力和准备工作。

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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.