@article{fdi:010062272,
  title = {{E}xperimental validation of a 2{D} overland flow model using high resolution water depth and velocity data},
  author = {{C}ea, {L}. and {L}egout, {C}. and {D}arboux, {F}. and {E}steves, {M}ichel and {N}ord, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper presents a validation of a two-dimensional overland flow model using empirical laboratory data. {U}nlike previous publications in which model performance is evaluated as the ability to predict an outlet hydrograph, we use high resolution 2{D} water depth and velocity data to analyze to what degree the model is able to reproduce the spatial distribution of these variables. {S}everal overland flow conditions over two impervious surfaces of the order of one square meter with different micro and macro-roughness characteristics are studied. {T}he 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. {W}e 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 {M}anning or {K}eulegan formulas for rough turbulent flow. {T}he simulations performed show that using {K}eulegan 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. {I}t 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.},
  keywords = {{O}verland flow ; 2{D} shallow water equations ; {B}ed roughness ; {L}arge {S}cale ; {P}article {I}mage {V}elocimetry ; {L}aser scanner},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology},
  volume = {513},
  numero = {},
  pages = {142--153},
  ISSN = {0022-1694},
  year = {2014},
  DOI = {10.1016/j.jhydrol.2014.03.052},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062272},
}