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Raynaud F., Borrell-Estupina V., Pistre S., Van-Exter S., Bourgeois N., Dezetter Alain, Servat Eric. (2015). Combining hydraulic model, hydrogeomorphological observations and chemical analyses of surface waters to improve knowledge on karst flash floods genesis. In : Cudennec C. (ed.), Eicker A. (ed.), Pilon P. (ed.), Stoffel M. (ed.), Viglione A. (ed.), Xu Z. (ed.) Extreme hydrological events. Göttingen : Copernicus, (369), 55-60. (Proceedings - AISH ; 369). IAHS-IACS-IAG Joint Symposium and General Assembly of the International Union of Geodesy and Geophysics, 26., Prague (CZE), 2015/06/22-07/02. ISSN 2199-899X

Lien direct chez l'éditeur doi:10.5194/piahs-369-55-2015

Titre
Combining hydraulic model, hydrogeomorphological observations and chemical analyses of surface waters to improve knowledge on karst flash floods genesis
Année de publication2015
Type de documentArticle référencé dans le Web of Science WOS:000365023000010
AuteursRaynaud F., Borrell-Estupina V., Pistre S., Van-Exter S., Bourgeois N., Dezetter Alain, Servat Eric.
InCudennec C. (ed.), Eicker A. (ed.), Pilon P. (ed.), Stoffel M. (ed.), Viglione A. (ed.), Xu Z. (ed.) Extreme hydrological events
SourceGöttingen : Copernicus, 2015, p. 55-60. (Proceedings - AISH ; 369). ISSN 2199-899X
ColloqueIAHS-IACS-IAG Joint Symposium and General Assembly of the International Union of Geodesy and Geophysics, 26., Prague (CZE), 2015/06/22-07/02
RésuméDuring a flood event over a karst watershed, the connections between surface and ground waters appear to be complex ones. The karst may attenuate surface floods by absorbing water or contribute to the surface flood by direct contribution of karst waters in the rivers (perennial and overflowing springs) and by diffuse resurgence along the hillslopes. If it is possible to monitor each known outlet of a karst system, the diffuse contribution is yet difficult to assess. Furthermore, all these connections vary over time according to several factors such as the water content of the soil and underground, the rainfall characteristics, the runoff pathways. Therefore, the contribution of each compartment is generally difficult to assess, and flood dynamics are not fully understood. To face these misunderstandings and difficulties, we analysed surface waters during six recent flood events in the Lirou watershed (a karst tributary of the Lez, in South of France). Because of the specific chemical signature of karst waters, chemical analyses can supply information about water pathways and flood dynamics. Then, we used the dilution law to combine chemical results, flow data and field observations to assess the dynamics of the karst component of the flood. To end, we discussed the surface or karst origin of the waters responsible for the apparent runoff coefficient rise during flash karst flood.
Plan de classementHydrologie [062] ; Géologie et formations superficielles [064]
LocalisationFonds IRD [F B010072193]
Identifiant IRDfdi:010072193
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010072193

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