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L'évolution du modelé lacustre et la salinité des lacs de Cojocna (plaine de Transylvanie, Roumanie)

Abstract : Salt lakes of Cojocna are located on a salt diapir in the Western part of the Transylvanian Basin. Their origin is anthropic (collapse of sedimentary materials which were covering the salty mines) and natural (salt dissolution). The basins are characterized by a very active dynamics : the increased filling, the mobility thresholds between the old mines, the general reduction of the slope, the mergering of many pits, the rapidity of the dissolution process at the contact between water and salt. Salinity differs from one lake to another. Lakes where the sedimentary material have not isolated salt from water show an important growth of salinity from surface to bottom (Durgǎu lake — 42 g/l at 0,5 m and 249 g/l at 43,8 m). When salt was separated from water through sedimentary materials, salinity has decreased to minimal values ; can appear inversions of the values, in the case of pumping out water from one lake to another to maintain the constant level. Due to the very great tourist flux, theses lakes must be preserved and the authors suggest a new town planning.
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Submitted on : Tuesday, April 16, 2019 - 11:53:30 AM
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Gheorghe Serban, Mircea Alexe, Laurent Touchart. L'évolution du modelé lacustre et la salinité des lacs de Cojocna (plaine de Transylvanie, Roumanie). Bulletin de l'Association de géographes français, Association des Géographes Français, 2005, 82 (2), pp.234-245. ⟨10.3406/bagf.2005.2458⟩. ⟨hal-02100841⟩



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