A STUDY ON THE EFFECT OF RETROGRESSIVE SUBMARINE LANDSLIDE ON TSUNAMI HEIGHT

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  • KOBA Masanobu
    金沢大学大学院 自然科学研究科環境デザイン学専攻
  • YAMAMOTO Akinori
    金沢大学大学院 自然科学研究科環境デザイン学専攻
  • UENO Takuya
    金沢大学大学院 自然科学研究科環境デザイン学専攻
  • YUHI Masatoshi
    金沢大学 理工学研究域環境デザイン学系

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  • 退行性海底地すべりが津波水位に与える影響の研究
  • タイコウセイ カイテイ ジスベリ ガ ツナミ スイイ ニ アタエル エイキョウ ノ ケンキュウ

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Abstract

 Retrogressive landslides starting from the lower part of the slope were focused and the relationship between the number of divisions of the landslide and the difference in movement start time and the generated tsunami water level were analyzed. In addition, the sensitivity of the tsunami water level to the depth of water and landslide peak speed was also analyzed. For the analysis, a nonlinear longwave model based on a finite volume Godunov-type scheme was used, and the ocean bottom fluctuation at each time was taken into consideration. Regarding the relatively small landslide with a total length of 1 km, we evaluated the influence of retrogression, mainly by extension of the tsunami wavelength and reduction of the amplitud, and the tsunami level due to the rigid body motion of single block was the largest, but it was found that the time lag causes amplification of the water level of about 10% on the opposite direction of landslide movement. This is due to the superimposition of the tsunami generated by individual small blocks. Amplification due to the retrogression can be estimated according to the water depth, and it can be reflected in the estimation of tsunami caused by individual landslide.

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