Dynamics and contribution of karst groundwater to surface flow during Mediterranean flood |
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Authors: | Hervé Jourde Axel Roesch Vincent Guinot Vincent Bailly-Comte |
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Institution: | (1) Hydrosciences, University of Montpellier II, 300, Avenue Emile Jeanbrau, 34095 Montpellier, France |
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Abstract: | This paper describes the role of groundwater contribution to surface flow at the Causse d’Aumelas, a karst system near Montpellier
(France), which is traversed by an intermittent river, the Coulazou. A first hydrologic model integrating a digital terrain
model shows the inability of a standard rainfall-runoff model to replicate recorded flood hydrographs. While the flood peaks
are routed through the karstic system along the Coulazou without a phase lag, the peak magnitude is somewhat modified. These
results indicate an initial karst system recharge followed by a significant contribution to surface flow. A hydrodynamic analysis
of ground-water flow confirms these results: the karst system first absorbs part of the rainfall, which induces a general
water table rise within the aquifer, and then contributes to surface flow in the Coulazou. |
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Keywords: | Flash flood Karst watershed Groundwater contribution Hydrodynamic analysis Flood modelling Mediterranean France |
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