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Comportement particulier lors des montées de crues dans les aquifères karstiques, mise en évidence d'une double fracturation et/ou de circulation profonde : exemple de la Fontaine de Vaucluse

Abstract : Lots of works demonstrate the complexity of functioning of Ihe Fontaine de Vaucluse. A daily sampling during a flood period, using "C of the total dis solved inorganic carbon (TDIC). is compared to classical parameters. It enables more accurate interpretation. With this experiment, we observed particular water outflows at the outlet during high flow periods. This water has a high magnesium content which reveals a long residence time: a TDIC ' 'C enrichment, significant of a long residence time within Ihe saturated zone, and a high temperature indicating again ¦in origin within Ihe saturated zone. this particular water flowing only during high discharge period can be assigned lo saturated zone with high pressure loss, which limits its participation to the flow in normal conditions. To explain this phenomenon, we propose the double fracturing concept. An open one. mainly with a drain function and a second one which generally plays a storage role. This storage fracturing could be made of joints or small fractures, but also of old drains with a bad connection to the present drainage system.
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https://hal-univ-avignon.archives-ouvertes.fr/hal-02296783
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Submitted on : Wednesday, September 25, 2019 - 2:56:45 PM
Last modification on : Wednesday, October 14, 2020 - 9:06:03 AM

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Christophe Emblanch, G.M Zuppi, Jean-Michel Puig. Comportement particulier lors des montées de crues dans les aquifères karstiques, mise en évidence d'une double fracturation et/ou de circulation profonde : exemple de la Fontaine de Vaucluse. Eclogae Geologicae Helvetiae, Springer Verlag, 2009, 92 (2), pp.251-257. ⟨10.5169/seals-168666⟩. ⟨hal-02296783⟩

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