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Décharge d'eau souterraine en mer et circulation d'eau de mer dans les sédiments : flux d'eau et d'éléments chimiques le long du littoral méditerranéen français

Abstract : The hydrogeological and biogeochemical importance of submarine groundwater inputs has recently been highlighted. Numerous studies around the world have shown that these contributions can challenge fluvial inputs. However, very few studies have been conducted along the French Mediterranean coastline despite the presence of several springs discharging directly into the sea. Submarine groundwater discharge locations were first detected using thermal infrared images. Water and nutrient flux were then estimated using radium isotopes (223Ra, 224Ra and 228Ra). Nutrient inputs are similar (and even greater, up to 20 times higher) to the local river inputs, except the Rhône River. We show that the nutrient fluxes driven by either submarine groundwater discharge (direct inputs of groundwater) or the circulation of seawater through the sediments are significant. These fluxes exist all along the French Mediterranean coastline. This is in contrast with the river inputs which are local inputs. These fluxes need to be considered in the chemical oceanic budgets (coastal seas and likely also in the sea/ocean budgets). These nutrient fluxes may have an impact on the quality of the coastal waters and on the coastal ecosystems.
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Simon Bejannin. Décharge d'eau souterraine en mer et circulation d'eau de mer dans les sédiments : flux d'eau et d'éléments chimiques le long du littoral méditerranéen français. Hydrologie. Université Paul Sabatier - Toulouse III, 2018. Français. ⟨NNT : 2018TOU30324⟩. ⟨tel-02475970⟩

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