Article (Scientific journals)
Filtering inertia-gravity waves from the initial conditions of the linear shallow water equations
Barth, Alexander; Beckers, Jean-Marie; Alvera Azcarate, Aïda et al.
2007In Ocean Modelling, 19 (3-4), p. 204-218
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Abstract :
[en] A method for filtering inertia-gravity waves from elevation and depth-averaged velocity is described. This filtering scheme is derived from the linear shallow water equations for constant depth and constant Coriolis frequency. The filtered solution is obtained by retaining only the eigenvectors corresponding to the geostrophic equilibrium and by discarding explicitly the eigenvectors corresponding to the fast moving inertia-gravity waves. An alternative formulation is derived using a variational approach. Both filtering methods are tested numerically for a periodic domain with constant depth and the variational approach is implemented for a closed domain with large topographic variations. The filtering methods significantly reduce the amplitudes of the inertia-gravity waves while preserving the mean flow. The variational method is compared to the Incremental Analysis Update technique and the benefits of the variational filter are presented. (C) 2007 Elsevier Ltd. All rights reserved.
Research center :
Centre Interfacultaire de Recherches en Océanologie - MARE - GHER
Disciplines :
Earth sciences & physical geography
Author, co-author :
Barth, Alexander  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique
Beckers, Jean-Marie  ;  Université de Liège - ULiège > Département d'astrophys.
Alvera Azcarate, Aïda  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Weisberg, R.;  University of South Florida
Language :
English
Title :
Filtering inertia-gravity waves from the initial conditions of the linear shallow water equations
Publication date :
2007
Journal title :
Ocean Modelling
ISSN :
1463-5003
eISSN :
1463-5011
Publisher :
Elsevier Sci Ltd, Oxford, United Kingdom
Volume :
19
Issue :
3-4
Pages :
204-218
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 January 2009

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