%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Le, H. A.
%A Lambrechts, J.
%A Ortleb, S.
%A Gratiot, Nicolas
%A Deleersnijder, E.
%A Soares-Frazao, S.
%T An implicit wetting-drying algorithm for the discontinuous Galerkin method : application to the Tonle Sap, Mekong River Basin
%D 2020
%L fdi:010079590
%G ENG
%J Environmental Fluid Mechanics
%@ 1567-7419
%K Numerical model ; Wetting-drying ; SLIM ; DG-FEM ; Mekong ; Tonle Sap lake
%K CAMBODGE ; TONLE SAP LAC ; MEKONG BASSIN
%M ISI:000552357900012
%N 4
%P 923-951
%R 10.1007/s10652-019-09732-7
%U https://www.documentation.ird.fr/hor/fdi:010079590
%> https://www.documentation.ird.fr/intranet/publi/2020/09/010079590.pdf
%V 20
%W Horizon (IRD)
%X The accurate simulation of wetting-drying processes in floodplains and coastal zones is a challenge for hydrodynamic modelling, especially for long time simulations. Indeed, dedicated numerical procedures are generally time-consuming, instabilities can occur at the wet/dry front, rapid transition of wet/dry interface and mass conservation are not always ensured. We present the extension of an existing wetting-drying algorithm in two space dimensions and its application to a real case. The wetting-drying algorithm is implemented in Second-generation Louvain-la-Neuve Ice-ocean Model (), a discontinuous Galerkin finite element model solving the shallow water equations in a fully implicit way. This algorithm consists in applying a threshold value of fluid depth for a thin layer and a blending parameter in order to guarantee positive values of the water depth, while preserving local mass conservation and the well balanced property at wet/dry interfaces. The technique is first validated against standard analytical test cases (Balzano 1, Balzano 3 and Thacker test cases) and is subsquently applied in a realistic domain, the Tonle Sap Lake in the Mekong River Basin, where the water level can vary by about 10 m between the dry and the wet season.
%$ 062 ; 020