Publications des scientifiques de l'IRD

Cea L., Legout C., Darboux F., Esteves Michel, Nord G. (2014). Experimental validation of a 2D overland flow model using high resolution water depth and velocity data. Journal of Hydrology, 513, p. 142-153. ISSN 0022-1694.

Titre du document
Experimental validation of a 2D overland flow model using high resolution water depth and velocity data
Année de publication
2014
Type de document
Article référencé dans le Web of Science WOS:000337258900014
Auteurs
Cea L., Legout C., Darboux F., Esteves Michel, Nord G.
Source
Journal of Hydrology, 2014, 513, p. 142-153 ISSN 0022-1694
This paper presents a validation of a two-dimensional overland flow model using empirical laboratory data. Unlike previous publications in which model performance is evaluated as the ability to predict an outlet hydrograph, we use high resolution 2D water depth and velocity data to analyze to what degree the model is able to reproduce the spatial distribution of these variables. Several overland flow conditions over two impervious surfaces of the order of one square meter with different micro and macro-roughness characteristics are studied. The first surface is a simplified representation of a sinusoidal terrain with three crests and furrows, while the second one is a mould of a real agricultural seedbed terrain. We analyze four different bed friction parameterizations and we show that the performance of formulations which consider the transition between laminar, smooth turbulent and rough turbulent flow do not improve the results obtained with Manning or Keulegan formulas for rough turbulent flow. The simulations performed show that using Keulegan formula with a physically-based definition of the bed roughness coefficient, a two-dimensional shallow water model is able to reproduce satisfactorily the flow hydrodynamics. It is shown that, even if the resolution of the topography data and numerical mesh are high enough to include all the small scale features of the bed surface, the roughness coefficient must account for the macro-roughness characteristics of the terrain in order to correctly reproduce the flow hydrodynamics.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Hydrologie [062]
Localisation
Fonds IRD [F B010062272]
Identifiant IRD
fdi:010062272
Contact