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Karstologia, 1983, Issue 2, p. 33-40
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Carte hydrogéomorphologique, hydrogéologie et hydrochimie du karst de Dorvan (Ain)
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Gibert J. , Laurent R. , Maire R.
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Abstract:
PRESENTATION OF THE HYDROGEOMORPHOLOGICAL MAP AT 1/100,000 ON KARST OF DORVAN (SOUTHERN JURA, AIN, FRANCE. Main researches about hydrology and hydrochemistry on this karst - The Dorvan massif is a low mountain Jurassian karst with a wet temperate climate and a little nival influence. The surface relief is covered with important decalcification clay. The drainage of the karst is assumed by superimposed systems, according to the excavation of the Torcieu watergap. The flow of the main outlet (Pissoir) is a pluvial type, which presents an annual cycle with a maximum in winter and a minimum in summer. The specific discharge is 31.4 l/s/km2. The dissolution rate is high: 81 mm/ky. 50% of the corrosion interests the epikarst, 50% interests the endokarst. During the Pleistocene, the glaciations played a direct or indirect role on the evolution of the Dorvan karst: nivo-karst during the Würm; fluvio-glacial up-building of the Torcieu watergap and correlated water logging of the lower karst during Würm and Tardiglacial periods; probable direct action of glaciers during the Riss.
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Keywords: geomorphology - hydrodynamic - hydro-chemistry - water tracing, speleogenesis, karstogenesis - southern jura
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