Field Survey of Coastal Dyke Failure due to 2011 Great Eastern Japan Earthquake Tsunami
Jayaratne, R. 2013. Field Survey of Coastal Dyke Failure due to 2011 Great Eastern Japan Earthquake Tsunami. UEL Research and Knowledge Exchange Conference 2013. University of East London, London 26 Jun 2013 London University of East London.
Post-tsunami field investigations are an essential component for improving our understanding of tsunamis and in developing tools necessary to mitigate their effects. Scientific data collected after a large tsunami is important for decision and policy makers, government bodies and practicing coastal engineers.
The two joint field surveys of UEL-Waseda University (Japan), carried out in summers of 2011 and 2012, covered particularly coastal dikes in Watari, Soma, Higashimatsushima, Ishinomaki, Iwanuma and Yamamoto cities in Miyagi and Fukushima prefectures. According to the surveys, the leeward toe of coastal dikes was scoured in many surveyed areas, though the seaward slope was often not completely washed away. Thus, the tsunami wave appears to first overtop the front face of the wall generating strong turbulence and currents at the leeward toe, creating a large scour hole. Then, due to the large wave pressure and buoyancy forces in the scour-hole area the protection cover in leeward slope is uplifted causing a complete failure of the structure.
The author will highlight the detailed results of two field surveys, general failure modes of coastal dykes and numerical modelling at Waseda University (Jayaratne et al, 2013; Esteban et al., 2013) at the conference.
|Keywords||post-tsunami field survey; coastal dyke; practicing coastal engineer; numerical modelling; UEL-Waseda research collaboration|
|Conference||UEL Research and Knowledge Exchange Conference 2013|
|Publisher||University of East London|
|26 Jun 2013|
|Publication process dates|
|Deposited||11 Jun 2013|
|Place of publication||London|
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