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Tsunami amplifies its height in shallow water area, and it may transfer into bore when it breaks and generates enormous forces (Yeh, 1991). The impact of tsunami bore to the vertical structures with two-dimensional cross section has been investigated through experiments and numerical simulations (Fukui et al., 1962; Palermo & Nistor, 2008). Those previous studies provide many useful information for the construction of coastal structures. However, the interaction between tsunami bore and structures with three-dimensional cross section have not been understood well, because tsunami flow around such structures becomes quite complex. Structures with three-dimensional section, such as a storage tank and tsunami evacuation building, can be seen as important infrastructures on many coastal areas. Especially, the recent tsunami Japan 2011 had brought serious damages on structures such as oil storages (International Energy Agency, 2011). Meanwhile, those structures are regulated by a building code to be protected by weir to restrain the spread of spilled contents (Dangerous Goods Safety Management [DGSM], 2003). This protective weir may produce quite complex flow around the structures, but the effects of the flow on the structures with weir have not been investigated well.

Study on the Interaction Between Tsunami Bore and Cylindrical Structure with Weir