THE DISPERSION EFFECT ON THE PROPAGATION OF TSUNAMI IN DEEP SEA REGION

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  • IWASE Hiroyuki
    社団法人 土木学会 株式会社エコー 沿岸デザイン本部環境水工部
  • GOTO Chiaki
    社団法人 土木学会 東海大学 工学部土木工学科
  • FUJIMA Koji
    社団法人 土木学会 防衛大学校 システム工学群建設環境学科
  • IIDA Kunihiko
    社団法人 土木学会 東海大学 工学部土木工学科

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Other Title
  • 深海域における波数分散効果が近地津波の伝播に及ぼす影響に関する考察

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From the numerical analysis for historical tsunamis, the dispersion effect on the propagation of tsunami in deep sea was investigated. Tsunami time-histories at the point of 200m in depth and spectrum analysis on the initial wave profiles showed that the dispersion effect in deep sea region should be considered even for near field tsunami. The index of dispersion effect considering the spectrum of initial wave profile and the water depth was obtained to determine the critical value where the dispersion term should be taken into account in the simulation. The empirical quation to estimate the index by using the fault parameters and the mean depth in tsunami source was also considered. From numerical simulation considering sea bottom motion, it was shown that the raising time of sea bottom motion affects the dispersion if it is less than 1min. Examinations were carried out on the effect of dispersion in deep sea area on the tsunami behavior in shallow water region for the case of 1983 Nihonkai-chubu tsunami.

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