FLUX DES SÉDIMENTS EN SUSPENSION DANS LES RIVIÈRES DU BASSIN DE LA MEUSE : PROPOSITION D’UNE TYPOLOGIE RÉGIONALE
BASÉE SUR LA DÉNUDATION SPÉCIFIQUE DES BASSINS VERSANTS
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Abstract
Soil erosion may be apprehended at the watershed scale by quantifying the transport of suspended sediment at its outlet. Approximately 2000 measurements of suspended sediment concentration were used to estimate the annual sediment discharge at 80 stations located in the Walloon region (Belgium), at the outlet of watershed from 16 to 2900 km². Some regional differences have been highlighted depending on the substrate and the land use in the watershed. At the region scale, the mean annual sediment yield reaches 20 t.km-2.yr-1 in Lorraine, 34 t.km-2.yr-1 in Ardenne and 69 t.km-2.yr-1in Entre-Vesdre-et-Meuse. The size of suspended particles and the proportion of organic matter also show differences between each agro-geographical area. Data from other academic or administrative works were incorporated into the database to identify the best sites for continuous measuring of the suspended load concentration in Wallonia.
Keywords
denudation, Meuse basin, Ardennes
I. INTRODUCTION
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