GEOSCAN, résultats de la recherche


TitreLimits of tidal energy dissipation by fluid flow in subsea formations
AuteurWang, K; van der Kamp, G; Davis, E E
SourceGeophysical Journal International vol. 139, no. 3, 1999 p. 763-768, (Accès ouvert)
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 1999025
ÉditeurOxford University Press (OUP)
Documentpublication en série
Mediapapier; numérique; en ligne
Sujetsflux thermique; perméabilité; milieux de marée; marées; croûte océanique; porosité; milieux marins; «tide loading» océanique; chargement d'eau; établissement de modèles; fractures; géologie marine; géologie structurale
Illustrationsanalyses; formulae; cross-sections, stratigraphic; graphs
Résumé(disponible en anglais seulement)
Tidal loading causes fluid flow through permeable seafloor and between regions of contrasting elastic properties or porosity within subsea formations. We examine theoretically the dissipation of energy by these flows and its global significance as a
mechanism for tidal energy dissipation. Expressions are given for energy dissipation rates in layered formations due to vertical flow caused by tidal loading, but the results can be used to constrain dissipation by other flow patterns. We consider flow near the seafloor, in gas-bearing sediments, and in highly fractured permeable igneous crust. Energy dissipation by the first two mechanisms is negligibly small globally, although it may be locally significant under extreme conditions. Under favourable conditions, flow in fractured crust may have greater energy dissipation, but the total amount is limited by the thickness of the permeable layer. Based on our current understanding of subsea hydrogeology, tidally induced flow in subsea formations appears to make little contribution to the observed global tidal energy dissipation.