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Combining Hydraulic Model, Hydrogeomorphological Observations and Chemical Analyses of Surface Waters to Improve Knowledge on Karst Flash Floods Genesis : Volume 369, Issue 369 (11/06/2015)

By Raynaud, F.

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Book Id: WPLBN0004021278
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Combining Hydraulic Model, Hydrogeomorphological Observations and Chemical Analyses of Surface Waters to Improve Knowledge on Karst Flash Floods Genesis : Volume 369, Issue 369 (11/06/2015)  
Author: Raynaud, F.
Volume: Vol. 369, Issue 369
Language: English
Subject: Science, Proceedings, International
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Van-Exter, S., Pistre, S., Bourgeois, N., Raynaud, F., Borrell-Estupina, V., Dezetter, A., & Servat, E. (2015). Combining Hydraulic Model, Hydrogeomorphological Observations and Chemical Analyses of Surface Waters to Improve Knowledge on Karst Flash Floods Genesis : Volume 369, Issue 369 (11/06/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: University of Montpellier/IRD/CNRS – UMR5569, HydroSciences Montpellier, 2 Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France. During 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.

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

Excerpt
Bailly-Comte, V., Jourde, H., and Pistre, S.: Conceptualization and classification of groundwater–surface water hydrodynamic interactions in karst watersheds: Case of the karst watershed of the Coulazou River (Southern France), J. Hydrol., 376, 456–462, 2009.; Bailly-Comte, V., Borrell-Estupina, V., Jourde, H., and Pistre, S.: A conceptual semi distributed model of the Coulazou River as a tool for assessing surface water–karst groundwater interactions during flood in Mediterranean ephemeral rivers, Water Resour. Res., 48, W09534, doi:10.1029/2010WR010072, 2012.; Bonacci, O., Ljubenkov, I., and Roje-Bonacci, T.: Karst flash floods: an example from the Dinaric karst (Croatia), Nat. Hazards Earth Syst. Sci., 6, 195–203, doi:10.5194/nhess-6-195-2006, 2006.; Borrell-Estupina, V., Ladouche, B., Malaterre, P. O., Ricci, S., Caballero, Y., Coustau, M., Dörfliger, N., Fleury, P., Jay-Allemand, M., Marechal, J. C., and Thual, O.: Forecasting and mitigation of flooding in a Mediterranean karstic watershed, IAHS Publ., 363, 288–294, 2014.; Borrell-Estupina, V., Raynaud, F., Bourgeois, N., Kong-A-Siou, L., Haziza, E., and Servat, E.: Operational tools to help stakeholders to protect and alert municipalities facing uncertainties and changes in karst flash floods, IUGG Pragues 2015 proceedings, in press, 2015.; Coustau, M., Bouvier, C., Borrell-Estupina, V., and Jourde, H.: Flood modelling with a distributed event-based parsimonious rainfall-runoff model: case of the karstic Lez river catchment, Nat. Hazards Earth Syst. Sci., 12, 1119–1133, doi:10.5194/nhess-12-1119-2012, 2012.; Darras, T., Raynaud, F., Borrell-Estupina, V., Kong A Siou, L., Vayssade, B., Johannet, A., and Pistre, S.: Behaviour of Lez karst basin during flash flood events: neural network modelling and in situ measurements, IUGG Pragues 2015 proceedings, in press, 2015.; Fairchild, I. J., Tooth, A. F., Huang, Y., Borsato, A., Frisia, S., and McDermott, F.: Spatial and temporal variations in water and stalactite chemistry in currently active caves: a precursor to interpretations of past climate, Proceedings of the fourth International Symposium on the Geochemistry of the Earth's Surface, Ilkley, Yorkshire, July 1996, University of Leeds, Leeds, 229–233, 1996.; Fleury, P., Maréchal, J. C., and Ladouche, B.: Karst flash-flood forecasting in the city of N\^imes (southern France), Eng. Geol., 164, 26–35, 2013.; Gaume, E., Livet, M., Desbordes, M., and Villeneuve, J. P.: Hydrological analysis of the river Aude, France, flash flood on 12 and 13 November 1999, J. Hydrol., 286, 135–154, 2004.; Kong A Siou, L., Johannet, A., Borrell-Estupina, V., and Pistre, S.: Complexity selection of a neural network model for karst flood forecasting: The case of the Lez Basin (southern France), J. Hydrol., 403, 367–380, 2011.; Labat, D., Ababou, R., and Mangin, A.: Linear and nonlinear input/output models for karstic springflow and flood prediction at different time scales, Stoch. Environ. Res. Risk A., 13, 337–364, 1999.; Makropoulos, C., Koutsoyiannis, D., Stanić, M., Djordjević, S., Prodanović, D., Dašić, T., Prohaska, S., Maksimović, \'C., and Wheater, H.: A multi-model approach to the simulation of large scale karst flows, J. Hydrol., 348, 412–424, 2008.; Maréchal, J. C., Ladouche, B., and Dörfliger, N.: Karst flash flooding in Mediterranean karst, the example of Fontaine de N\^imes, Eng. Geol., 99, 138–146, 2008.

 

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