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RESEARCH PRODUCT

Quantification de la dynamique sédimentaire en contexte anthropisé. L'érosion des versants viticoles de Côte d'Or.

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The wine slopes of Côte d'Or (Burgundy, France) are subject to the combined effects of runoff/erosion processes and intense cultivation practices. The purpose of this study is to characterize the erosion processes, and to quantify the sedimentary dynamics over different time scales and spatial scales. Sedimentary budgets show that the studied slopes, with grounds that are made very sensitive to the runoff phenomena by intensive mechanisation, are subject to erosion rates of several millimetres per year. Overflow triggering and its extension, which determine sediment transfer distances, are dependent on a runoff threshold. The existence of this threshold is observed through the analysis of the spatial distribution of erosion rates, as well as in the pluviometry sequences. Anthropic forcing is thus paradoxically illustrated in two ways : first, through high soil erosion rates, and secondly through the vine grower's will to maintain a tank colluvial by partial or total compensation of erosion, in particular by sediment supplies. This trade-off is essentially responsible for the observed variability in sedimentary dynamics.