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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Two-dimensional 2-phase modeling of controlled sediment deposition during floods: the case study of ...
Two-dimensional 2-phase modeling of controlled sediment deposition during floods: the case study of the bevieux off-stream settling basin.
Author : LAUNAY M.(1), CONDE D.(2), LEITE RIBEIRO M.(1), MANSO P. (3), DE MONTMOLLIN G.(1) & FERREIRA R.M.L.(2)
ABSTRACT
Floods of the Avançon river have caused in the past important sediment deposition in the city of Bex, Switzerland. An offstream
sediment settling basin has been built at B¨¦vieux, 1.5 km upstream of Bex. The basin allows sediment deposition
for flood events with return periods above 20 years. Laboratory experiments in a physical model were conducted at EPFL
to define its geometry. The present study aims at validating a hydrodynamic-morphological simulation tool to be used to
forecast future events. The validation relies on data from the physical model of the Bevieux settling basin. The numerical
model, STAV2D, is a two-dimensional depth-averaged deterministic model for highly unsteady flows over complex timeevolving
geometries. Validation comprises four hydraulic events and one hydro-sedimentary event investigated in the
physical model. Water level for hydraulic simulations without sediment transport are accurately reproduced by the model.
For simulation with sediment transport, volumes of sediment deposited in the river bed and in the sediment basin differ
from those obtain with the physical model by a factor of two. Differences are discussed and improvements of the
numerical model and tool are suggested.
File Size : 726,681 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 28/08/2015
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