Experiments on generation of surface waves by an underwater moving bottom
Author
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Jamin, Timothée
Author
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Gordillo, Leonardo
Author
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Ruiz Chavarría, Gerardo
Author
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Berhanu, Michael
Author
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Falcon, Eric
Admission date
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2015-10-07T15:40:15Z
Available date
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2015-10-07T15:40:15Z
Publication date
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2015
Cita de ítem
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Proceeding of the Royal Society A-Mathematical Physical and Engineering Sciences Volumen: 471 Número: 2178 (2015)
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Identifier
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DOI: 10.1098/rspa.2015.0069
Identifier
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https://repositorio.uchile.cl/handle/2250/134207
General note
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Artículo de publicación ISI
en_US
Abstract
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We report laboratory experiments on surface waves generated in a uniform fluid layer whose bottom undergoes an upward motion. Simultaneous measurements of the free-surface deformation and the fluid velocity field are focused on the role of the bottom kinematics (i.e. its spatio-temporal features) in wave generation. We observe that the fluid layer transfers bottom motion to the free surface as a temporal high-pass filter coupled with a spatial low-pass filter. Both filter effects are often neglected in tsunami warning systems, particularly in real-time forecast. Our results display good agreement with a prevailing linear theory without any parameter fitting. Based on our experimental findings, we provide a simple theoretical approach for modelling the rapid kinematics limit that is applicable even for initially non-flat bottoms: this may be a key step for more realistic varying bathymetry in tsunami scenarios.