Chemical and isotopic labelling (Cl(−), (18)O) of an autumnal flood for a small burnt Mediterranean basin
1994
TRAVI, Y. | LAVABRE, J. | BLAVOUX, B. | Martin, C.
After the forest fire that swept across the Massif des Maures (Southern France) in August 1990, a drastic change in the hydrological cycle was observed on the small burnt catchment of Rimbaud (Real Collobrier ERB). Along with the usual hydrological and hydrochemical measurements, stable isotopes were measured for rainfall and runoff. Vegetation disappearance and, consequently, the influence on throughfall encouraged a comparison of oxygen 18 content with chloride content. During the flood of 9 December 1990, these two elements showed a very similar behaviour, and it was interesting to notice that the hydrograph separations obtained by isotopic methods were comparable. When the usual factors of chloride and oxygen 18 evolution were examined, 45% usual factors of chloride and oxygen 18 evolution were examined, 45% of runoff came from “ancient” water and, in this case, the unsaturated area did not play a significant role. Moreover, as regards the behaviour of the water temperature indicating the end of runoff, one could estimate the new water amount infiltrating to the water table at less than 30%.
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