SCOURING MECHANISM BEHIND SEAWALL FROM TSUNAMI OVERFLOW AND OPTIMUM CONDITIONS TO REDUCE TSUNAMI ENERGY WITH AN ARTIFICIAL TRENCH

Gozo Tsujimoto, Ryo Mineura, Fumihiko Yamada, Tetsuya Kakinoki, Kohji Uno

Abstract


Some of coastal structures were collapsed owing to the local scouring by overflows after Tohoku tsunami. In order to understand the characteristics of the scouring behind seawalls due to tsunami, experimental studies and numerical simulation were carried out. The sour profiles formed behind a seawall could be classified into two types. The turbulent kinematic energy has effects on the development of the scour hole. The kinematic energy will decrease with an artificial trench behind a seawall. The rate of energy decay depended on the scale of trench not the shape.

Keywords


laboratory experiment; CADMAS-SUF; k-e turbulence modeling

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References


CADMAS-SURF 2001. Coastal Development Institute of Technology(in Japanese)

Tanimoto, T., K. Tokita, H. Kitagawa and S. Araki 1978. Investigation on resistance of earth bank and reduction by dug pool against Tsunami, Journal of Costal Engineering, JSCE, Vol.59, 316-320 (in Japanese).




DOI: https://doi.org/10.9753/icce.v34.structures.38