Influence of velocity distribution and density stratification on generation or propagation of tsunamis

T. Kakinuma, K. Nakamura, K. Yamashita, K. Nakayama

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

Abstract

A set of wave equations derived on the basis of a variational principle in consideration of both strong nonlinearity and strong dispersion of surface/internal waves is numerically solved to simulate generation and propagation of tsunamis in the vertical two-dimension. The velocity potential in each fluid layer is expanded into a power series of vertical position, such that the accuracy of vertical distribution of velocity depends on the number of expansion terms. Numerical results of surface displacement are compared with the existing experimental data, where tsunamis are generated by the seabed uplift. When the fundamental equations are reduced to nonlinear shallow water equations, the numerical model cannot represent propagation of a long wave group especially in distant-tsunami propagation, leading to overestimation of both the wave height and wave steepness of the first wave. The wave height becomes larger in the stratified ocean than that in a one-layer case, although the present density distribution hardly affects the tsunami phase over a long-distance travel.

Original languageEnglish
Title of host publicationAsian and Pacific Coasts, 2011 - Proceedings of the 6th International Conference
EditorsJoseph Hun-Wei Lee, Chiu-On Ng
Publisher[publishername] World Scientific
Number of pages1
ISBN (Print)9789814366489
DOIs
Publication statusPublished - 2011 Jan 1
Externally publishedYes
Event6th International Conference on Asian and Pacific Coasts, APAC 2011 - Kowloon, Hong Kong
Duration: 2011 Dec 142011 Dec 16

Publication series

NameAsian and Pacific Coasts, 2011 - Proceedings of the 6th International Conference

Conference

Conference6th International Conference on Asian and Pacific Coasts, APAC 2011
CountryHong Kong
CityKowloon
Period11/12/1411/12/16

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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