Investigation on tsunami run-up and sediments in small rivers around the Akita region in 1983

Kazuya Watanabe, Junya Taniguchi, Noritoshi Saito, Naoyuki Hayashi, Takanobu Kamataki

 The tsunami which run-up in river over the embankment affected serious damage in coastal area at the 2011 Tohoku earthquake and tsunami. Therefore the measures to river run-up of the tsunami were important in thinking about the tsunami disaster prevention in the coastal area. On the other hand, there were few records of the tsunami data, though active faults were near the land on the Sea of Japan side and time to tsunami arrival from an earthquake occurrence tends to be short. Therefore it was simulated based on 1983 Japan Sea Earthquake to perform the comparison with the measured value with Sea of Japan side particularly.
 The following things were confirmed from a calculation result and measured. It is thought that the tsunami sediment in this area is of the sea origin at Takogawa River. (1) The tsunami run over the beach bank, (2) The tsunami flowed into the small river, (3) The flow to return to the sea from the east side in the right bank the small river was confirmed at Shirayukigawa River.

Journal of Japan Society of Civil Engineers, Series B3 (Ocean Engineering)

Japan Society of Civil Engineers

77

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