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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Effects of landward slope protection and toe protection work shape at coastal dikes on landward bed ...
Effects of landward slope protection and toe protection work shape at coastal dikes on landward bed scouring caused by tsunami overflow
Author : TOMIHIRO IIBOSHI(1), SHIRO MAENO(2), KEISUKE YOSHIDA(3) , DAISUKE TAKATA(4) & AKIRA YAMAMURA(5)
ABSTRACT
Coastal dikes in Iwate, Miyagi, and Fukushima prefectures in Japan were damaged severely by tsunami overflow
consequent to the 2011 off-the-Pacific coast of Tohoku Earthquake. A main factor of the failure was landward bed
scouring following the tsunami overflow. Coastal dikes were destroyed completely or partially because of embankment
material outflows caused by scouring of the landward bed. Because of this severe damage, the tsunami committee in
Japan recommended several methods to produce resilient structures for coastal dikes. One method is landward toe
protection works to reduce the landward toe bed scouring. It can improve the coastal dike stability. However, the relation
of protection work shapes to landward bed scouring characteristics remains unclear. Therefore, we particularly examined
the effects of landward slope and toe protection work shapes on landward bed scouring. We conducted small-scale
experiments to clarify the effects of works with different characteristics. The obtained results demonstrate that a large
scouring hole was formed around the landward toe area in any shape of the slope protection works without bed
protection works. Landward bed protection works can reduce size of the scouring hole. A surface protuberances of
landward toe protection works is more effective to reduce the scouring depths and areas.
File Size : 1,136,867 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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