Urban fluvial flood modelling using a two-dimensional diffusion-wave treatment, part 2: development of a sub-grid-scale treatment

Détails

ID Serval
serval:BIB_4FB2ACFD995A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Urban fluvial flood modelling using a two-dimensional diffusion-wave treatment, part 2: development of a sub-grid-scale treatment
Périodique
Hydrological Processes
Auteur(s)
Yu D., Lane S.N.
ISSN
0885-6087
Statut éditorial
Publié
Date de publication
2006
Volume
20
Numéro
7
Pages
1567-1583
Langue
anglais
Notes
Publication type : Article
Résumé
This paper develops and tests a sub-grid-scale wetting and drying
correction for use with two-dimensional diffusion-wave models of urban
flood inundation. The method recognizes explicitly that representations
of sub-grid-scale topography using roughness parameters will provide an
inadequate representation of the effects of structural elements on the
floodplain (e.g. buildings, walls), as such elements not only act as
momentum sinks, but also have mass blockage effects. The latter may
dominate, especially in structurally complex urban areas. The approach
developed uses high-resolution topographic data to develop explicit
parameterization of sub-grid-scale topographic variability to represent
both the volume of a grid cell that can be occupied by the flow and the
effect of that variability upon the timing and direction of the lateral
fluxes. This approach is found to give significantly better prediction
of fluvial flood inundation in urban areas than traditional calibration
of sub-grid-scale effects using Manning's n. In particular, it
simultaneously reduces the need to use exceptionally high values of n
to represent the effects of using a coarser mesh process representation
and increases the sensitivity of model predictions to variation in n.
Mots-clé
fluvial flood modelling, urban areas, raster-based modelling, sub-grid wetting treatment, spatial resolution, process representation, RESOLUTION, RIVER
Web of science
Création de la notice
03/02/2011 14:40
Dernière modification de la notice
20/08/2019 14:05
Données d'usage