TY - GEN
T1 - Destruction mechanism of coastal levees on tht sendai bay coast hit by the 2011 tsunami
AU - Mano, Akira
AU - Tanaka, Hitoshi
AU - Udo, Keiko
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - A mega tsunami hit the Sendai Bay Coast on March 11, 2011, overtopped coastal levees and intruded into far inland while sweeping houses, people and others away. Eighty percent of the levees which rimmed the coast to protect the land from storm surges together with the wind waves were broken in various degrees of damage by the tsunami. The national and local governments decided to rebuild the levees to be durable even for mega tsunamis. This requirement motivates us to find the destruction mechanism of the coastal levees. We conducted field investigations and collected the tsunami records, aerial photos and tsunami videos. Especially, the video taken from the helicopter "Michinokugo" which flew along the Sendai Coast to the south during the attack of the tsunami's leading wave enables us to see the breaking process. Integrated analysis leads to two step mechanisms of the destruction: the first step of breaking the upper structure of the levees by the surging bore of the leading wave and the second step of expanding erosion by the return flow concentration.
AB - A mega tsunami hit the Sendai Bay Coast on March 11, 2011, overtopped coastal levees and intruded into far inland while sweeping houses, people and others away. Eighty percent of the levees which rimmed the coast to protect the land from storm surges together with the wind waves were broken in various degrees of damage by the tsunami. The national and local governments decided to rebuild the levees to be durable even for mega tsunamis. This requirement motivates us to find the destruction mechanism of the coastal levees. We conducted field investigations and collected the tsunami records, aerial photos and tsunami videos. Especially, the video taken from the helicopter "Michinokugo" which flew along the Sendai Coast to the south during the attack of the tsunami's leading wave enables us to see the breaking process. Integrated analysis leads to two step mechanisms of the destruction: the first step of breaking the upper structure of the levees by the surging bore of the leading wave and the second step of expanding erosion by the return flow concentration.
KW - Breach
KW - Durable levee
KW - Flow concentration
KW - Return flow
KW - Tsunami surge
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M3 - Conference contribution
AN - SCOPUS:84884998924
SN - 9780989661119
T3 - Proceedings of the Coastal Engineering Conference
BT - Proceedings of the 33rd International Conference on Coastal Engineering 2012, ICCE 2012
T2 - 33rd International Conference on Coastal Engineering 2012, ICCE 2012
Y2 - 1 July 2012 through 6 July 2012
ER -