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During a flood event over a karst watershed, the connections between surface\udand ground waters appear to be complex ones. The karst may attenuate surface\udfloods by absorbing water or contribute to the surface flood by direct\udcontribution of karst waters in the rivers (perennial and overflowing\udsprings) and by diffuse resurgence along the hillslopes. If it is possible\udto monitor each known outlet of a karst system, the diffuse contribution is\udyet difficult to assess. Furthermore, all these connections vary over time\udaccording to several factors such as the water content of the soil and\udunderground, the rainfall characteristics, the runoff pathways. Therefore,\udthe contribution of each compartment is generally difficult to assess, and\udflood dynamics are not fully understood. To face these misunderstandings and\uddifficulties, we analysed surface waters during six recent flood events in\udthe Lirou watershed (a karst tributary of the Lez, in South of France).\udBecause of the specific chemical signature of karst waters, chemical\udanalyses can supply information about water pathways and flood dynamics.\udThen, we used the dilution law to combine chemical results, flow data and\udfield observations to assess the dynamics of the karst component of the\udflood. To end, we discussed the surface or karst origin of the waters\udresponsible for the apparent runoff coefficient rise during flash karst flood

proceedings of iahs

Combining hydraulic model, hydrogeomorphological observations and chemical analyses of surface waters to improve knowledge on karst flash floods genesis