Article Dans Une Revue Géomorphologie : relief, processus, environnement Année : 2008

Landform connectivity and waves of negative feedbacks during the paraglacial period, a case study : the Tabuc subcatchment since the end of the Little Ice Age (massif des Écrins, France)

Résumé

While efficiency of the paraglacial reworking is largely accepted, this paper explores the drawbacks of the paraglacial model. We document some waves of negative feedback that can occur in the alpine Tabuc subcatchment (Guisane, Massif des Écrins) following the post-Little Ice Age deglaciation. Some disconnections within the sedimentary cascade are due to the influence of a Late Little Ice Age frontal moraine. Coarse debris have built up the frontal moraine while sediment export consists of fine debris, carried out by proglacial streams. Such disconnections generated a significant decrease in sediment export from the upper part of the catchment since the 1950s, as revealed by the contraction of the surface of active channels in the Pré du Tabuc area. This evolution may reveal that paraglacial processes are intermittent during the paraglacial period even though large amounts of glacigenic sediments are available.

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Dates et versions

hal-00545252 , version 1 (09-12-2010)

Identifiants

Citer

Etienne Edouard Cossart. Landform connectivity and waves of negative feedbacks during the paraglacial period, a case study : the Tabuc subcatchment since the end of the Little Ice Age (massif des Écrins, France). Géomorphologie : relief, processus, environnement, 2008, 14 (4), pp.249-260. ⟨10.4000/geomorphologie.7430⟩. ⟨hal-00545252⟩
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