Numerical investigation on characteristics of long wave components amplified under the 2018 Typhoons Jebi and Trami observed along the coast of Wakayama, Japan

IF 1.9 3区工程技术 Q3 ENGINEERING, CIVIL

Coastal Engineering Journal Pub Date : 2021-11-28 DOI:10.1080/21664250.2021.1997492

Y. Yamanaka, Y. Tajima

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Abstract

ABSTRACT The tide gauge data at Shirahama in Tanabe Bay on the Wakayama coast during Typhoons Jebi and Trami in 2018 showed two dominant oscillation components with periods of approximately 40–45 min and 7 min. We investigated the characteristics of the unique resonances using wavelet analysis and numerical simulations. Through the numerical simulation of storm surges by Jebi and Trami and the modeling of Trami with different tracks, we found that oscillations having a period of 40–45 min were primarily induced by the resonance in large areas, including Tanabe Bay and Kii Strait, which is north of the bay. The amplification of this large-scale resonance was sensitive to the forward speed and angle of the typhoon tracks. In addition, Green’s functions were developed to investigate local resonant characteristics in Tanabe Bay. The spatial distributions of the amplitude and phase difference of Green’s functions at different locations showed that the observed 7-min oscillations were amplified by the resonance of two adjacent small inlets at the Shirahama tide gauge station. The resonance between these two local inlets produced a long-lasting ~7-min oscillation observed at the tide gauge.

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2018年日本和歌山沿海台风Jebi和Trami放大长波分量特征的数值研究

摘要2018年台风Jebi和Trami期间，和歌山海岸田边湾白滨的潮汐计数据显示了两个主要振荡分量，周期分别约为40–45分钟和7分钟。我们使用小波分析和数值模拟研究了独特共振的特征。通过Jebi和Trami对风暴潮的数值模拟以及Trami对不同轨道的模拟，我们发现周期为40–45分钟的振荡主要是由大面积的共振引起的，包括田边湾和海湾以北的Kii海峡。这种大尺度共振的放大对台风路径的前进速度和角度很敏感。此外，还开发了格林函数来研究田边湾的局部共振特性。Green函数在不同位置的振幅和相位差的空间分布表明，白滨验潮站两个相邻小进水口的共振放大了观测到的7分钟振荡。这两个局部入口之间的共振产生了在验潮仪上观察到的持续约7分钟的振荡。

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.