Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace:

Frontshear and backshear instabilities of the mean longshore current
Baquerizo, Asunción; Caballeria, Miquel; Losada, Miguel A.; Falqués, Albert
Universitat de Vic. Escola Politècnica Superior; Universitat de Vic. Grup de Recerca en Medi Ambient i Alimentació
An analytical model based on Bowen and Holman [1989] is used to prove the existence of instabilities due to the presence of a second extremum of the background vorticity at the front side of the longshore current. The growth rate of the so-called frontshear waves depends primarily upon the frontshear but also upon the backshear and the maximum and the width of the current. Depending on the values of these parameters, either the frontshear or the backshear instabilities may dominate. Both types of waves have a cross-shore extension of the order of the width of the current, but the frontshear modes are localized closer to the coast than are the backshear modes. Moreover, under certain conditions both unstable waves have similar growth rates with close wave numbers and angular frequencies, leading to the possibility of having modulated shear waves in the alongshore direction. Numerical analysis performed on realistic current profiles confirm the behavior anticipated by the analytical model. The theory has been applied to a current profile fitted to data measured during the 1980 Nearshore Sediment Transport Studies experiment at Leadbetter Beach that has an extremum of background vorticity at the front side of the current. In this case and in agreement with field observations, the model predicts instability, whereas the theory based only on backshear instability fai led to do so.
(c) American Geophysical Union, 2001
15 p.
American Geophysical Union

Documentos con el texto completo de este documento

Ficheros Tamaño Formato
artconlli_a2001_caballeria_miquel_frontshear.pdf 863.6 KB PDF

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Falqués, Albert; Van den Berg, Niels; Ribas Prats, Francesca; Caballeria, Miquel