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Karstologia, 1984, Issue 3, p. 25-33
Un exemple de karst haut-alpin : le Désert de Platé (Haute-Savoie)
Maire, R.
Abstract:
AN EXAMPLE OF HIGH ALPINE KARST: THE DéSERT DE PLATé (HAUTE-SAVOIE) - Situated in the French Northern Alps between 1600m and 2800m elevation, the Désert de Platé is characterised by a wet, cold and very snowy climate (P = 2400-2800 mm/year). We observe several morphoclimatic levels: the upper mountain karst (1500-1700m), the subalpine karst (1700-1950m), the alpine karst (1950 - 2600m) and the proglacial karst (well developed in the Haut-Giffre massif. Glacio-karstic landforms like cirque-dolines and pavements (Schichttreppenkarst) are inherited from the quaternary glaciations. The deep karst underlines the part of quaternary climatic sequence with complex drainage and fillings. Now, the karstic flow is a nival type (maximum during the spring and summer minimum) but the hydrochemical cycles are opposite (spring minimum). Nevertheless, because of a very abundant underground discharge during hot season (80%), the exported limestone reaches 75% of annual amount. The specific dissolution is strong (104 mm/ky), but it does not reach the optimum of forest mountain karst, like Vercors (120-170mm/ky).
AN EXAMPLE OF HIGH ALPINE KARST: THE DéSERT DE PLATé (HAUTE-SAVOIE) - Situated in the French Northern Alps between 1600m and 2800m elevation, the Désert de Platé is characterised by a wet, cold and very snowy climate (P = 2400-2800 mm/year). We observe several morphoclimatic levels: the upper mountain karst (1500-1700m), the subalpine karst (1700-1950m), the alpine karst (1950 - 2600m) and the proglacial karst (well developed in the Haut-Giffre massif. Glacio-karstic landforms like cirque-dolines and pavements (Schichttreppenkarst) are inherited from the quaternary glaciations. The deep karst underlines the part of quaternary climatic sequence with complex drainage and fillings. Now, the karstic flow is a nival type (maximum during the spring and summer minimum) but the hydrochemical cycles are opposite (spring minimum). Nevertheless, because of a very abundant underground discharge during hot season (80%), the exported limestone reaches 75% of annual amount. The specific dissolution is strong (104 mm/ky), but it does not reach the optimum of forest mountain karst, like Vercors (120-170mm/ky).
Keywords: karst morphology - speleology - karst hydrogeology - hydrochemistry - caves - fillings - haute savoie.