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Article

Nearshore Dynamics of Storm Surges and Waves Induced by the 2018 Typhoons Jebi and Trami Based on the Analysis of Video Footage Recorded on the Coasts of Wakayama, Japan

1
Department of Civil Engineering, The University of Tokyo, Tokyo 113-8656, Japan
2
Research Fellow of Japan Society for the Promotion of Science, Tokyo 102-0083, Japan
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(11), 413; https://doi.org/10.3390/jmse7110413
Received: 30 September 2019 / Revised: 5 November 2019 / Accepted: 11 November 2019 / Published: 13 November 2019
(This article belongs to the Special Issue Observation, Analysis, and Modeling of Nearshore Dynamics)
In this study, field surveys along the coasts of Wakayama Prefecture, Japan, were first conducted to investigate the coastal damage due to storm surges and storm-induced waves caused by the 2018 Typhoons Jebi and Trami. Special focus was placed on the characteristic behavior of nearshore waves through investigation of observed data, numerical simulations, and image analysis of video footage recorded on the coasts. The survey results indicated that inundation, wave overtopping, and drift debris caused by violent storm-induced waves were the dominant factors causing coastal damage. Results of numerical simulations showed that heights of storm-induced waves were predominantly greater than storm surge heights along the entire coast of Wakayama in both typhoons. However, computed gradual alongshore variations in wave and surge heights did not explain locally-concentrated inundation and run-up heights observed along the coasts. These results indicate that complex nearshore hydrodynamics induced by local nearshore bathymetry might have played a significant role in inducing such local wave characteristics and the associated coastal damage. Analysis of video footage recorded during Typhoon Jebi, for example, clearly showed evidence of amplified infragravity wave components, which could enhance inundation and wave run-up. View Full-Text
Keywords: post-event survey; the 2018 Typhoons Jebi and Trami; tide gauge data; image analysis; infragravity wave post-event survey; the 2018 Typhoons Jebi and Trami; tide gauge data; image analysis; infragravity wave
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MDPI and ACS Style

Yamanaka, Y.; Matsuba, Y.; Tajima, Y.; Shibata, R.; Hattori, N.; Wu, L.; Okami, N. Nearshore Dynamics of Storm Surges and Waves Induced by the 2018 Typhoons Jebi and Trami Based on the Analysis of Video Footage Recorded on the Coasts of Wakayama, Japan. J. Mar. Sci. Eng. 2019, 7, 413. https://doi.org/10.3390/jmse7110413

AMA Style

Yamanaka Y, Matsuba Y, Tajima Y, Shibata R, Hattori N, Wu L, Okami N. Nearshore Dynamics of Storm Surges and Waves Induced by the 2018 Typhoons Jebi and Trami Based on the Analysis of Video Footage Recorded on the Coasts of Wakayama, Japan. Journal of Marine Science and Engineering. 2019; 7(11):413. https://doi.org/10.3390/jmse7110413

Chicago/Turabian Style

Yamanaka, Yusuke; Matsuba, Yoshinao; Tajima, Yoshimitsu; Shibata, Ryotaro; Hattori, Naohiro; Wu, Lianhui; Okami, Naoko. 2019. "Nearshore Dynamics of Storm Surges and Waves Induced by the 2018 Typhoons Jebi and Trami Based on the Analysis of Video Footage Recorded on the Coasts of Wakayama, Japan" J. Mar. Sci. Eng. 7, no. 11: 413. https://doi.org/10.3390/jmse7110413

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