Numerical study on sea bottom boundary layer and bed shear stress under tsunami

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Tsunami-induced bottom shear stress has commonly been evaluated using a friction coefficient for steady flow, such as Manning’s roughness coefficient, Chézy formula and Darcy-Weisbach equation, assuming development of bottom boundary layer up to the water surface under tsunami. However, applicability of steady friction law to tsunami wave has never been scientifically investigated, and it has simply been assumed that long-period wave motion satisfies quasi-steady flow condition. In the present study, the k-w model is used to calculate velocity profile and resultant sea bottom shear stress under shoaling hypothetical tsunami propagating from tsunami source area to nearshore region. It is found that steady friction is not valid in the entire computational region from the source area to shallow region due to extremely thin boundary layer thickness beneath tsunami.

Original languageEnglish
Title of host publicationProceedings of the 29th International Ocean and Polar Engineering Conference, ISOPE 2019
EditorsJin S. Chung, Odd M. Akselsen, HyunWoo Jin, Hiroyasu Kawai, Yongwon Lee, Dmitri Matskevitch, Suak Ho Van, Decheng Wan, Alan M. Wang, Satoru Yamaguchi
PublisherInternational Society of Offshore and Polar Engineers
Pages3189-3195
Number of pages7
ISBN (Print)9781880653852
Publication statusPublished - 2019 Jan 1
Event29th International Ocean and Polar Engineering Conference, ISOPE 2019 - Honolulu, United States
Duration: 2019 Jun 162019 Jun 21

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume3
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference29th International Ocean and Polar Engineering Conference, ISOPE 2019
CountryUnited States
CityHonolulu
Period19/6/1619/6/21

Keywords

  • Bottom shear stress
  • Boundary layer
  • K-w model
  • Numerical simulation
  • Tsunami
  • Turbulence model

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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  • Cite this

    Tanaka, H., & Tinh, N. X. (2019). Numerical study on sea bottom boundary layer and bed shear stress under tsunami. In J. S. Chung, O. M. Akselsen, H. Jin, H. Kawai, Y. Lee, D. Matskevitch, S. Ho Van, D. Wan, A. M. Wang, & S. Yamaguchi (Eds.), Proceedings of the 29th International Ocean and Polar Engineering Conference, ISOPE 2019 (pp. 3189-3195). (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 3). International Society of Offshore and Polar Engineers.