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Comparison between three-dimensional linear and nonlinear tsunami generation models ArchiMer
Kervella, Youen; Dutykh, Denys; Dias, Frédéric.
The modeling of tsunami generation is an essential phase in understanding tsunamis. For tsunamis generated by underwater earthquakes, it involves the modeling of the sea bottom motion as well as the resulting motion of the water above. A comparison between various models for three-dimensional water motion, ranging from linear theory to fully nonlinear theory, is performed. It is found that for most events the linear theory is sufficient. However, in some cases, more-sophisticated theories are needed. Moreover, it is shown that the passive approach in which the seafloor deformation is simply translated to the ocean surface is not always equivalent to the active approach in which the bottom motion is taken into account, even if the deformation is supposed to...
Tipo: Text Palavras-chave: Nonlinear shallow water equations; Potential flow; Water waves; Boundary element method; Finite volume method; Tsunami generation.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2620.pdf
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Estudio del comportamiento de ondas lineales barotrópicas en la atmósfera tropical y el litoral ecuatoriano-colombiano en un período determinado OceanDocs
Martínez, R..
Usando series de tiempo de promedios diarios de presión atmosférica, temperatura ambiental, temperatura superficial y nivel medio del mar en los años 1994-1995 en cinco estaciones costeras de Ecuador y Colombia y una estación en las Islas galápagos (Ecuador) se aplicaron las técnicas del análisis espectral para determinar las oscilaciones existentes en el océano y la atmósfera. Se obtuvieron con alto niveles de coherencia, cinco modos predominantes en la atmósfera tropical: la oscilación de 37 días, muy próxima a la oscilación de Madden-Julian (1972), un modo de tres semanas con características de la " autooscilación" de 21 días, Murakami, 1974 y que es de naturaleza planetaria, una tercera oscilación de 17 días, de características muy similares a la onda...
Tipo: Journal Contribution Palavras-chave: Barotropic motion; Water waves; Spectral analysis; Time series; Oceanographic data; Fixed stations; Water temperature data; Air temperature; Atmospheric pressure; Mean sea level; Atmospheric pressure; Spectral analysis; Air temperature; Http://aims.fao.org/aos/agrovoc/c_693; Http://aims.fao.org/aos/agrovoc/c_28964; Http://aims.fao.org/aos/agrovoc/c_230.
Ano: 1998 URL: http://hdl.handle.net/1834/2199
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Sources de donnees meteo-oceaniques pour l'ingenierie marine ArchiMer
Olagnon, Michel; Becq, Françoise; Charriez, Patrick.
To design offshore structures, to prepare operations at sea and unusual transportations on marine routes, to assess safety levels with respect to marine climate, one needs practical data describing the wave, wind and current conditions that may occur. This essential information is unfortunately very seldom readily available exactly for the geographical area of interest. Where to look for it, how to evaluate and choose amongst what one may find, how to get aware of its adequation and drawbacks for the projected use, whom to call for help, as many questions to which this report is expected to bring some answers. Engineers in charge of coastal or offshore projects, logistics managers implied in sea transportations, underwriters, planners for shore equipments...
Tipo: Text Palavras-chave: Offshore engineering; Water waves; Ocean currents; Meteorological data.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/rapport-988.pdf
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