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Arcos M.E.M.,Amec Foster Wheeler | MacInnes B.T.,Central Washington University | Arreaga P.,Instituto Oceanografico Of La Armada Of Ecuador | Rivera-Hernandez F.,University of Washington | And 2 more authors.
Quaternary Research (United States) | Year: 2013

Tsunamis and storms instigate sedimentological and geomorphological changes to the coastal system, both long-term and ephemeral. To accurately predict future coastal hazards, one must identify the records that are generated by the processes associated with these hazards and recognize what will be preserved. Using eyewitness accounts, photographs, and sedimentology, this study documents pre- and post-tsunami conditions and constrains the timing and process of depositional events during and following the 11 March 2011 Tohoku tsunami in the coastal system at El Garrapatero, Galapagos Islands. While the tsunami acted as both an erosional and depositional agent, the thick, fan-like sand sheet in El Garrapatero was primarily emplaced by overwash deposition during high tide from swell waves occurring between 19-25 March and 17-22 April 2011. The swell waves were only able to access the terrestrial coastal system via a channel carved by the 2011 Tohoku tsunami through the barrier sand dune. This combined deposit could result in an overestimation of the hazard if interpreted to be the result of only one event (either tsunami or wind-generated waves). An analogous sand layer, younger than 1390-1530 cal yr BP, may record a similar, prior event. © 2013 University of Washington. Source


Ioualalen M.,CIRAD - Agricultural Research for Development | Renteria W.,Instituto Oceanografico Of La Armada Of Ecuador | Ilayaraja K.,University of Madras | Chlieh M.,CIRAD - Agricultural Research for Development | Arreaga-Vargas P.,Instituto Oceanografico Of La Armada Of Ecuador
Environmental Modelling and Software | Year: 2010

A numerical simulation of the 26th December 2004 Indian Ocean tsunami for the entire coast of Sri Lanka is presented. The simulation approach is based on a fully nonlinear Boussinesq tsunami propagation model and a robust coseismic source. The simulation is first confronted to available measured wave height. The agreement between observations and the predicted wave heights allowed a reasonable validation of the simulation. As a result a synoptic picture of the tsunami impact is provided over the entire coast of Sri Lanka. It is found that amplification due to shoaling applies mainly in the Eastern and Southern coast because, here, the wave is propagating across the sea floor slope, while propagating along the slope for the Western coast. Spots of high waves are due to wave focusing in some coastal areas while local submarine canyons in other areas inhibit the wave amplification. © 2010 Elsevier Ltd. Source


Ioualalen M.,French National Center for Scientific Research | Arreaga-Vargas P.,Instituto Oceanografico Of La Armada Of Ecuador | Pophet N.,Chulalongkorn University | Chlieh M.,French National Center for Scientific Research | And 4 more authors.
Pure and Applied Geophysics | Year: 2010

A numerical simulation of the 26th December, 2004 Indian Ocean tsunami of the Tamil Nadu coastal zone is presented. The simulation approach is based on a fully nonlinear Boussinesq tsunami propagation model and included an accurate computational domain and a robust coseismic source. The simulation is first confronted to available tide gauge and runup observations. The agreement between observations and the predicted wave heights allowed a reasonable validation of the simulation. As a result, a full picture of the tsunami impact is provided over the entire coastal zone Tamil Nadu. The processes responsible for coastal vulnerability are discussed. © 2010 Birkhäuser/Springer Basel AG. Source

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