RESISTANCE OF EARTH BANK AGAINST TSUNAMI AND STRUCTURE OF DUG POOL FORMED BY TSUNAMI IN THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE
Abstract
In the 2011 Off the Pacific Coast of Tohoku Earthquake, very huge damages of civil engineering structures etc. occurred by tsunami strikes along the rias coast and plane coast of the Pacific Ocean. For the urgent repair and the future reconstruction of these structures, the fundamental damage characteristics of these structures should be clarified by the field surveys from which effective lessons can be expected. In this paper, several important lessons on the resistance characteristics of 13 earth structures such as river dykes and sand banks which are obtained from the field surveys conducted by the authors are indicated.
Because many dug pools were formed by the tsunami overflow at the backside of earth embankments and sea walls in this earthquake, the fundamental characteristics of the 10 dug pools are investigated thorough the field survey to estimate the effects of the dug pools quantitatively in the future. Furthermore through the field survey conducted at the representative site named Idoura, the scale and waterbed conditions of the natural canals and the strength characteristics of the river dykes and the base ground neighboring the natural canals are measured in detail and discussed. These fundamental lessons and data on the earth banks and dug pools will be able to be used to simulate the effects of the dug pools and to discuss the artificial canals as one of the hard countermeasures to reduce the tsunami height and/or force.- Publication:
-
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))
- Pub Date:
- 2012
- DOI:
- 10.2208/jscejseee.68.I_1091
- Bibcode:
- 2012JSCSE..68I1091T