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Article Dans Une Revue Earth Surface Dynamics Année : 2023

Phenomenological model of suspended sediment transport in a small catchment

Résumé

We develop a phenomenological model of suspended sediment transport on the basis of data acquired in the Capesterre river, which drains a small tropical catchment in Guadeloupe. The model correctly represents the concentration of suspended sediment during floods, provided that the relation between concentration and water level forms a counterclockwise loop. In the model, the properties of the sediment and of the river are all lumped into four parameters: a settling velocity related to the size of the suspended sediment, a threshold water level which acts as a proxy for the threshold shear stress, a characteristic entrainment rate, and a dimensionless exponent. The value of the parameters changes from one flood to the next, probably reflecting changes in the characteristics of the river and the fine sediment. Finally, a test of the model against data acquired in a small catchment in the French Alps suggests that the model is versatile enough to be used in diverse hydrological settings.

Domaines

Géomorphologie
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Dates et versions

hal-04089800 , version 1 (05-05-2023)

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Amande Roque-Bernard, Antoine Lucas, Eric Gayer, Pascal Allemand, Céline Dessert, et al.. Phenomenological model of suspended sediment transport in a small catchment. Earth Surface Dynamics, 2023, 11 (3), pp.363-381. ⟨10.5194/esurf-11-363-2023⟩. ⟨hal-04089800⟩
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