Estimation of the water balance of alluvial aquifers in region of high isotopic contrast: an example from southeastern France
1998
Gulielmi, Y. | Mudry, J. | Blavoux, B.
The much contrasted orographic and climatic characters of southeastern France serve to establish a hydrological balance of the porous aquifers in the region. Comparing a regional average gradient of 18O content versus elevation, which was calculated on low-water period karst waters content, with a -10.5 per thousand average delta of Alpine rivers, an estimate of the percentages brought to these aquifers is proposed under the form of an abacus. It appears that the main groundwaters of the Var, the Durance and the Rhone are fed by an average of 20-30% of Provencal underground contribution, and 70-80% shallow contribution from the Alpine rivers. These figures reveal that local supplies range between 25 and 10% of the average yearly discharge flowing in the porous and shallow aquifers.
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