Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Online ISSN : 1883-8944
Print ISSN : 1884-2399
ISSN-L : 1883-8944
Paper
ANALYSIS OF TSUNAMI SEDIMENT TRANSPORT OVER A SILTY BOTTOM BASED ON LABORATORY EXPERIMENT AND NUMERICAL MODELING
Sohei JIMBOYusuke YAMANAKATakenori SHIMOZONO
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2022 Volume 78 Issue 2 Pages I_181-I_186

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Abstract

 The 2011 Tohoku tsunami accompanied a large amount of silt and clay along the Sanriku coast and supplied them substantially onto the inland area. Such a tsunami containing silty materials could contribute to increasing coastal and human damage. However, characteristics of tsunami-induced suspension of silty materials and their effect on tsunami flows have not been sufficiently understood. This study conducted a laboratory experiment of sediment transport on a silty bottom and developed a numerical model to investigate the detailed processes and mechanisms. Results from the experiment indicated that a wave-induced flow suspended more silty materials for higher fluidities of bed materials. A vortical flow induced by wave breaking further contributed to enhancing the sediment suspension from the bottom. The sediment processes were reproduced by the numerical model with two empirical parameters of sediment entrainment calibrated with the experimental result. The numerical model reasonably reproduced a local scour on the bottom as well as the concentration of suspended materials.

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© 2022 by Japan Society of Civil Engineers
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