[en] The availability of high-resolution topographic data enables the modeling of urban floods with a high level of accuracy. However, such a modelling has a poor computational efficiency. Subgrid models enable to decrease the computational time by using coarse cells while preserving information from the detailed topographic data to some degree. In particular, shallow-water models with porosity constitute a subgrid model well-adapted for urban flood modeling. In this article, a new set of fully dynamic shallow-water equations with depth-dependent porosities is presented. Then, the implementation of the model is detailed and preliminary results obtained for a theoretical two-dimensional urban area are analyzed. Unlike recent works, the new model solves the fully dynamic shallow-water equations with depth-dependent and anisotropic porosities, a divergent formulation of the bed slope term, a non-staggered grid with quadrilateral cells and an efficient use of look-up tables to store the porosity relations.
Disciplines :
Civil engineering
Author, co-author :
Bruwier, Martin ; Université de Liège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Archambeau, Pierre ; Université de Liège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Erpicum, Sébastien ; Université de Liège > Scientifiques attachés au Doyen (Sc.appliquées)
Pirotton, Michel ; Université de Liège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Dewals, Benjamin ; Université de Liège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Language :
English
Title :
A shallow-water model with depth-dependent porosity for urban flood modeling
Publication date :
June 2015
Event name :
36th IAHR World Congress
Event organizer :
International Association for Hydro-Environment Engineering and Research (IAHR)
Event place :
The Hague, Netherlands
Event date :
28 June - 3 July 2015
Audience :
International
Main work title :
E-proceedings of the 36th IAHR World Congress
Peer reviewed :
Peer reviewed
Name of the research project :
FloodLand
Funders :
ARC grant for Concerted Research Actions, financed by the Wallonia-Brussels Federation