La Houille Blanche
Number 4, Juin 1994
|Page(s)||41 - 46|
|Published online||01 October 2009|
Pompage d'Ekman dans un écoulement de marée : génération d'un courant résiduel
Ekman pumping in a tidal motion : generation of a rectified current
Laboratoire des Ecoulements Géophysiques et Industriels Institut de Mécanique de Grenoble, C.N.R.S., URA 1509
Among the potential sources of suspended materials transport, tidal currents obviously play an important role : firstly due to the usual asymetry between flux and ebb (non-linearity of the tidal wave), but also because of the coastal rectification of a purely sinusoidal offshore current, which tends to the generation of a residual circulation. This process comes out from the modification of the lateral boundary layer by the " Ekman pumping ". We make a physical modelling of this motion on the large rotating tank of the Institut de Mécanique de Grenoble and study the hydrodynamic behaviour by varying the main parameters of the flow. The results of this work may be applied to the firench coasts of Pas-de-Calais, near Boulogne s/mer.
© Société Hydrotechnique de France, 1994
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