2019年10月2日
Study on boundary layer development and bottom shear stress beneath a tsunami
Coastal Engineering Journal
- ,
- 巻
- 61
- 号
- 4
- 開始ページ
- 574
- 終了ページ
- 589
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/21664250.2019.1672127
- 出版者・発行元
- TAYLOR & FRANCIS LTD
© 2019, © 2019 Japan Society of Civil Engineers. This paper presents a detailed investigation on unsteady effects in bottom boundary layer beneath a tsunami. In numerical simulation of tsunami, bottom shear stress has commonly been evaluated by using steady flow friction laws such as Manning equation, simply assuming that long-period wave motion satisfies quasi-steady flow conditions. However, the present study found that the behavior of tsunami-induced bottom boundary layer has an unsteady characteristics and acts similar to that induced by wind-generated waves even under long-period wave motion. As a result, bottom shear stress under tsunami is much larger than the estimation using steady friction coefficient due to a steep velocity gradient in the bottom boundary layer. Surprisingly, the steady flow friction law is not valid in almost the entire computational domain, from the source area to shallow region. This result highly coincides with the field measurement data obtained by Lacy group during the 2010 Chilean Tsunami at the Monterey Bay mouth in U.S. A correction coefficient is proposed to take into account unsteady effects in the conventional estimation method using a steady friction factor; this approach is validated by comparing with numerical simulation results using k-ω turbulence model.
- リンク情報
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- DOI
- https://doi.org/10.1080/21664250.2019.1672127
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000488424800001&DestApp=WOS_CPL
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85075108210&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85075108210&origin=inward
- ID情報
-
- DOI : 10.1080/21664250.2019.1672127
- ISSN : 2166-4250
- eISSN : 1793-6292
- SCOPUS ID : 85075108210
- Web of Science ID : WOS:000488424800001