Rapid assessment of tsunami source impacts on low-lying coastal areas using offshore wave superposition and static sweep of onshore terrain

IF 1.9 3区工程技术 Q3 ENGINEERING, CIVIL

Coastal Engineering Journal Pub Date : 2021-11-23 DOI:10.1080/21664250.2021.2005364

Y. Yamanaka, T. Shimozono

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引用次数: 2

Abstract

ABSTRACT Tsunami source impacts in coastal areas should be investigated thoroughly; however, investigating the associated source uncertainties can incur large computational costs. This study presents a technique for rapid assessment of the impacts and their uncertainties based on a combination of the linear wave superposition for Green’s functions and a static sweep algorithm for onshore terrain. A waveform from a tsunami source is quickly estimated at a shore based on the aforementioned superposition of single-point sources simulated by a linearized Boussinesq model. The maximum water surface elevation change in the waveform, the maximum tsunami elevation, is then determined. In addition, a digital elevation model for onshore terrain that can be inundated by a tsunami is scanned using the sweep algorithm to statically compare the tsunami and ground elevations. As a result, areas with lower ground elevation than the tsunami are quickly identified as potential tsunami hazard zones. This combined analysis is applied to assess potential tsunami sources in the Japan Sea, and the source impacts are comprehensively investigated for Sakata and Akita cities in Japan. Our analysis successfully and quantitatively indicates source impacts while considering their great uncertainty. Additionally, critical areas for expanding tsunami inundation are quickly and efficiently identified.

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利用近海波浪叠加和陆上地形静态扫描快速评估海啸源对低洼沿海地区的影响

摘要：应彻底调查海啸对沿海地区的影响；然而，研究相关的源不确定性可能会产生巨大的计算成本。本研究提出了一种基于格林函数的线性波叠加和陆上地形的静态扫描算法的快速评估影响及其不确定性的技术。基于线性化Boussinesq模型模拟的单点源的上述叠加，在海岸快速估计海啸源的波形。然后确定波形中的最大水面高程变化，即最大海啸高程。此外，还使用扫描算法扫描了可能被海啸淹没的陆上地形的数字高程模型，以静态比较海啸和地面高程。因此，地面海拔低于海啸的地区很快被确定为潜在的海啸危险区。该组合分析用于评估日本海潜在的海啸源，并对日本坂田市和秋田市的海啸源影响进行了全面调查。我们的分析成功地定量地表明了源影响，同时考虑到其巨大的不确定性。此外，迅速有效地确定了海啸淹没范围扩大的关键区域。

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 Journal 工程技术-工程：大洋

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

7.5 months

期刊介绍： Coastal Engineering Journal is a peer-reviewed medium for the publication of research achievements and engineering practices in the fields of coastal, harbor and offshore engineering. The CEJ editors welcome original papers and comprehensive reviews on waves and currents, sediment motion and morphodynamics, as well as on structures and facilities. Reports on conceptual developments and predictive methods of environmental processes are also published. Topics also include hard and soft technologies related to coastal zone development, shore protection, and prevention or mitigation of coastal disasters. The journal is intended to cover not only fundamental studies on analytical models, numerical computation and laboratory experiments, but also results of field measurements and case studies of real projects.