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Medientyp:
E-Artikel
Titel:
Sur le fléchissement des débits estivaux de deux rivières du Massif Central français, la Sénouire et l'Allanche, affluent et sous-affluent de l'Allier
Beschreibung:
This study is a contribution to forecasting low summer stream flows in an oceanic région where long periods without rain are exceptional. The field work for this study has been carried out in two little mountainous basins (average altitude : 1 097 m and 912 m). Drainage areas are the sames (159 km2) and the précipitation from May to November in the river basins is about 500 mm. But the geological conditions in both basins are not at ail the same : one basin is almost made of basalts (Allanche), the other of granits and gneisses. Comparative analysis shows that each river has its own depletion rythm and that the basin storage discharges, in the same conditions of initial discharge, rain and température, is 2.2 quicker in the crystalline basin than in the basaltic one.
This study is a contribution to forecasting low summer stream flows in an oceanic région where long periods without rain are exceptional. The field work for this study has been carried out in two little mountainous basins (average altitude : 1 097 m and 912 m). Drainage areas are the sames (159 km2) and the précipitation from May to November in the river basins is about 500 mm. But the geological conditions in both basins are not at ail the same : one basin is almost made of basalts (Allanche), the other of granits and gneisses. Comparative analysis shows that each river has its own depletion rythm and that the basin storage discharges, in the same conditions of initial discharge, rain and température, is 2.2 quicker in the crystalline basin than in the basaltic one.