Fonctionnement hydro-sédimentaire et bilan sédimentaire du lac de Saint-Germain-de-Confolens (Charente, France) : paramètres géomorphologiques à prendre en considération dans la gestion du lac

Véronique Maleval 1 Frédéric Pitois 2
1 GEOLAB-CE - Capital Environnemental
GEOLAB - Laboratoire de Géographie Physique et Environnementale
Abstract : Lake Saint Germain was created near Saint-Germain-de-Confolens (Charente, France) for drinking water production in 1972. Since then, various short-term studies have shown water quality to degrade, and sedimentation to gradually fill the lake. The lake appears to have lost 42 % of its initial water capacity due to present mean sedimentation rates nearing 8000 m3.year-1. A sedimentary balance shows that this phenomenon can be attributed to watershed allochtonous particulate inflow for 87 %. Sediment fluxes and their lacustrine accumulation act in turn as in-lake nutrient sources accelerating the eutrophication process. As a conclusion for this study, some solutions are proposed to improve drinking water production sustainability.
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Submitted on : Monday, November 27, 2017 - 2:19:11 PM
Last modification on : Friday, February 22, 2019 - 1:33:45 AM

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Véronique Maleval, Frédéric Pitois. Fonctionnement hydro-sédimentaire et bilan sédimentaire du lac de Saint-Germain-de-Confolens (Charente, France) : paramètres géomorphologiques à prendre en considération dans la gestion du lac. Physio-Géo - Géographie Physique et Environnement, AERES, 2017, pp.197-227. ⟨http://physio-geo.revues.org/5544⟩. ⟨10.4000/physio-geo.5544⟩. ⟨hal-01649319⟩

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