GRAILLOT , Didier

Le présent document propose différents outils et méthodes d'approche pour caractériser les échanges entre rivières et écoulements karstiques dans la traversée des plateaux calcaires. Ce document est destiné aux acteurs de l'eau qui souhaitent étudier ces échanges. Les méthodes présentées ont été testées, développées et appliquées au cours d'un...

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The purpose of this article is to characterize, only on a geochemical plan (major and minor elements and traces), the alteration processes and their consequences on the karsts of the northern scrublands of the Gard department and those of the southern Ardèche, where the caves have conserved sediment depositions of late Cretaceous and Paleogene...

Support system for managers and representatives for flood risk mitigation in Mediterranean urban areas. The objective is to propose a tool for the space management dedicated to decision makers which could detect urban areas subjected to flood risk in order to act on urban public policies in the field of construction, traffic management and...

The content presented in this article is an integral part of the research work carried out with the aim of characterizing, evaluating and modeling theexchanges between the Cèze River and its karstic system that it crosses in the middle part of the valley [Chapuis, 2017]. This paper presents the Cèze watershed with a lithological description of...

Since a few years, the recurrence of floods causing important material and human damages in Europe and in other parts of the world, led to the development of operational procedures and research in order to reduce its impact This paper presents a flood risk prevention approach successfully combining geomatic tools, multi-criteria analyses to...

In the interest of creating a point of reference allowing to know the hydrological conditions of the karst system and for the purpose of using it as a parameter in a modeling procedure, a Hydric Indicator of the Karst (HIK) was established from the knowledge acquired on the functioning of the karstic hydrosystem of the Cèze. This indicator...

Several artificial tracing campaigns were carried out in 2014 and 2015 to assess underground circulations on both sides of the Cèze river (France, Gard) and specially to identify the role of the Cèze-Ardèche interfluve in a complicated geological context. Previous tracing operations had collected important data on groundwater flows on the...

Groundwater flow circulating in a karstic hydrosystem is very difficult to grasp in space and time. In cases where the karstic aquifer is located between two rivers, the watershed is not easy to identify using a single analysis of a geological map. In this study, the understanding regarding the karstic hydrosystem between the...

International audience

International audience

Groundwater in karst aquifers is a valuable resource in Mediterranean region which is particularly threatened by climate change. Climate change induces an increase in evapotranspiration and a decrease in rainfall available for groundwater resource. This impacts directly karst aquifer recharge and thus indirectly karst-river interactions. The...

Since the emergence of the carbonated platform of the southeastern basin of France during the Albian-Cénomanian, a long process of complex polyphased karstification is being installed under joint influence of tectonics, eustatism and climate. The endorheic basin of Issirac includes terrains from Cretaceous until Eocene age. Connected to the...

The karst-river exchanges of the Ceze river canyon area were partly constrained by geochemical approach. This study was carried out on river and springs waters for moderate (june 2015) and low (july 2015) river flow periods. The chemical (major element concentrations) and isotopic (&#94834SSO4) properties highlight the major control of water...