Yvan Caballero

French Geological Survey | BRGM

Long-term observations of spring discharge provide an alternative to estimate the evolution of groundwater resources based on observational data at catchment scale. Karst springs can be found in large parts of Europe covering all climate zones of the mid latitudes. Continuous spring discharge measurements are holistic signals, representing both fas...

Accurate evaluation of natural recharge is fundamental for the estimation of renewable groundwater resources and constitutes a key issue for water resources management. Among physical, chemical and numerical methods, the water-table fluctuation technique is simple and easy to use. The main question is where, with respect to the draining stream, to...

Global climate change-induced stresses on coastal water resources include water use restrictions, saline intrusions, and permanently modifying or damaging regional resources. Groundwater in coastal regions is often the only freshwater resource available, so an in-depth understanding of the aquifer, and the aquifer’s response to climate change, is e...

Analysing practices, social representations and behaviours of socio-hydro systems' actors. Abstract: This working paper presents and discusses the approaches and methods used by the PRECOS Team of the G-Eau research unit to analyse practices, social representations and behaviours of socio-hydro systems' actors. Four groups of methods are presented:...

Today, large-scale modelling tools are needed for anticipating the expected impacts of climate change on hydrosystems and for planning mitigation measures. We developed a spatially-distributed model for the MARTHE hydrogeological modelling computer code as a preliminary tool for France, and carried out a first evaluation over a 10-year period, comp...

Various methods are available for assessing uncertainties in climate impact studies. Among such methods, model weighting by expert elicitation is a practical way to provide a weighted ensemble of models for specific real-world impacts. The aim is to decrease the influence of improbable models in the results and easing the decision-making process. I...

Mountainous areas are an important source of water resources, especially in the Mediterranean. The PIRAGUA project aims at assessing the water resources of the Pyrenees in the past and in the future. To this aim, different modelling approaches were used in order to assess the water resources of the Pyrenees and their future evolution. In this study...

The Pyrenees range is a transboundary mountain region shared by Spain, France and Andorra. As many other mountain regions, the Pyrenees host the upper catchments and recharge zones of the region's main river basins and aquifers. Therefore, it is the main source of water resources that are used in a much larger area that includes important urban con...

Groundwater recharge quantification is essential for sustainable groundwater resources management, but typically limited to local and regional scale estimates. A high-resolution (1 km × 1 km) dataset consisting of long-term average actual evapotranspiration, effective precipitation, a groundwater recharge coefficient, and the resulting groundwater...

Various methods are available for assessing uncertainties in climate impact studies. Among such methods, model weighting by expert elicitation is a practical way to provide a weighted ensemble of models for specific real-world impacts. The aim is to decrease the influence of improbable models in the results and easing the decision-making process. I...

Concentration-Discharge (C-Q) relationship analyses allow better understanding catchment water origin and hydrological process variability across time (from stormevent to pluriannual scale). Though, those approaches mostly include integrative methods that consider catchments as a whole. The aim of this article is to assess the potential of a combin...

Ce chapitre a été produit par 17 chercheurs de différentes disciplines (hydrologie, hydrogéologie, géographie, science politique, sciences de gestion…), appartenant à une communauté de recherche régionale sur l’eau bien structurée et identifiée aux niveaux national et international. Les contributions réunies ici présentent un état synthétique et ac...

Modelling of heterogeneous aquifers, such as crystalline aquifers, is often difficult and, flow and transport predictions are always uncertain, suffering of our imperfect knowledge of the spatial distribution of aquifer parameters. This paper aims to test the robustness of a first-order hydraulic conductivity map estimated from both a detailed wate...

One of the goals of the ERA4CS INDECIS project (http://www.indecis.eu/) is to use available climate datasets at the European scale to derive user-oriented indicators. In this framework, we adapted a methodology to compute the present and future groundwater recharge by precipitation at the European scale. This indicator of groundwater availability a...

In the Mediterranean, mountainous areas are an important source of water resources. Not only do mountains generate most of runoff, but they also store water in soils, as groundwater in aquifers and as snowpack which melts in spring where it can be diverted and used for agriculture. However, climate change and local anthropic processes are changing...

Climate change is expected to have a significant impact on water resources in mountain areas, as it is the case of the Pyrenees range between France, Spain and Andorre. Independently of future changes on rainfall patterns, global temperature rise is likely to provoke larger and earlier snowmelt, and enhanced precipitation deficits during the dry su...

Karst development influences the hydrological response of catchments. However, such an impact is poorly documented and even less quantified, especially over short scales of space and time. The aim of this article is thus to define karst influence on the different hydrological processes driving runoff generation, including interbasin groundwater flo...

The behaviour of transient groundwater mounds in response to infiltration from surface basins has been studied for decades, but some common settings still lack analytical solutions. It has been shown that applying mathematical integration to the line-sink solution developed by Hantush in the 1960s for pumping an unconfined aquifer, considering rech...

Rapport disponible gratuitement à l'adresse suivante : http://ficheinfoterre.brgm.fr/document/RP-70301-FR Le projet MODGEAU (MODèle Géologique pour la gestion des ressources en EAU), réalisé dans le cadre de la convention n°2016C006 avec l’Agence de l’Eau Loire – Bretagne, vise à mieux comprendre la géométrie des grands ensembles aquifères de la pa...

This study introduces a novel workflow to model the heterogeneity of complex aquifers using the multiple-point statistics algorithm DeeSse. We illustrate the approach by modeling the Continental Pliocene layer of the Roussillon aquifer in the region of Perpignan (southern France). When few direct observations are available, statistical inference fr...

Time series of environmental tracers (groundwater stable isotope composition, electrical conductivity and temperature) and concentration breakthrough curves of artificial tracers (uranine, eosine, amino-G and naphtionate) have been analyzed to characterize fast preferential and slow matrix in-transit recharge flows in the Paleocene-Eocene limestone...

Karst development influences the hydrological response of catchments. However, such impact is poorly documented and even less quantified, especially over short space and time scales. The aim of this article is thus to define karst influence on the different hydrological processes driving runoff generation, including interbasin groundwater flow (IGF...

Abstract. This study presents a novel workflow to model the internal heterogeneity of complex aquifers using the multiple-point statistics algorithm DeeSse. We illustrate the applicability of this workflow on the Roussillon's aquifer in the region of Perpignan (southern France). This work is part of a project aiming at assessing the groundwater dyn...

Managed aquifer recharge (MAR) constitutes a potential and promising solution to deal with several water management issues: water shortage, water level depletion, groundwater pollution, and saline water intrusion. Among others, the proper siting and cost evaluation of such a solution constitutes sources of uncertainty for the implementation of MAR...

The new AquiFR hydrometeorological modelling platform was developed to provide short-to-long-term forecasts for groundwater resource management in France. This study aims to describe and assess this new tool over a long period of 60 years. This platform gathers in a single numerical tool several hydrogeological models covering much of the French me...

El proyecto PIRAGUA, financiado por el Programa Interreg POCTEFA de la UE, aborda la evaluación del ciclo hidrológico de los Pirineos en el contexto del cambio climático. El período de tiempo del proyecto es 2018-2020. Los objetivos del proyecto son unificar y homogeneizar la información existente, evaluar escenarios futuros, desarrollar indicadore...

The Pyrenees range is a transboundary region shared by Spain, France and Andorre whose water resources are diverse (snowmelt and rainfall runoff in a topographically variable context, groundwater in complex and heterogeneous aquifers) and poorly known. As many other mountain regions, this territory is particularly vulnerable to the impacts of clima...

The Pyrenees range is a transboundary region shared by Spain, France and Andorre whose water resources are diverse (snowmelt and rainfall runoff in a topographically variable context, groundwater in complex and heterogeneous aquifers) and poorly known. As many other mountain regions, this territory is particularly vulnerable to the impacts of clima...

Crystalline aquifers are among the most complex groundwater systems, requiring adequate methods for realistic characterization and suitable techniques for groundwater resources. A tool is needed that can assess the hydrodynamic parameters cost-effectively. A model is presented, based on a groundwater-budget equation and water-table fluctuation meth...

The new AquiFR hydometeorological modelling platform was developed to provide short to long-term forecasts for groundwater resource management in France. The present study aims to describe and assess this new tool over a long-term period of 60 years. This platform gathers in a single numerical tool different hydrogeological models covering much of...

The Pyrenees range is a transboundary region shared by Spain, France and Andorre. As many other mountain regions, it is excedentary in water resources that are used in a much larger area that includes important urban concentrations and productive rural areas. This territory is particularly vulnerable to the consequences of climate change. The PIRAG...

The aim of this work is to map runoff indicators at the catchment scale, and to highlight the influence of karstified zones on flood regimes. The proposed method allows highlighting on a test zone, possible relationships between annual hydrological indicators (computed from daily data), and a geomorphological index: the Index of Development and Per...

http://www.mdpi.com/2072-4292/9/11/1119/htm

Groundwater can represent a boundary condition for the dynamics of water into the critical zone. Groundwater level fluctuations influence several hydrodynamic and geochemical processes in the non-saturated zone such as, droughts and floods, rock-water interactions, surface water and soils quality, climate variability and change impacts… Several dif...

Dans le cadre de projets de recherche, une démarche prospective participative a été réalisée afin d'explorer les futurs possibles de la gestion des nappes côtières dans le Roussillon en prenant en compte le changement climatique. Quatre ans après la fin de l'exercice, quels en sont les traces et les impacts ? Ces moments de réflexion partagée ont-i...

An innovative approach for regionalizing the 3-D effective-porosity field is presented and applied to two large, overexploited and deeply weathered crystalline aquifers located in southern India. The method derives from earlier work on regionalizing a 2-D effective-porosity field in that part of an aquifer where the water table fluctuates, which is...

Groundwater resource assessment is a major concern for water managers who have to balance water demands and resources at a basin or territory scale. One operational way to address this question is often to estimate only the part of recharge which is linked to precipitation. Many methods to estimate groundwater recharge are described in the literatu...

Groundwater resources are part of larger social-ecological systems. In this chapter, we review the various dimensions of these complex systems in order to uncover the diversity of elements at stake in the evolution of an aquifer and the loci for possible actions to control its dynamics. Two case studies illustrate how the state of an aquifer is emb...

Groundwater resources are part of larger social-ecological systems. In this chapter, we review the various dimensions of these complex systems in order to uncover the diversity of elements at stake in the evolution of an aquifer and the loci for possible actions to control its dynamics. Two case studies illustrate how the state of an aquifer is emb...

Several methods can be used to estimate groundwater recharge. These vary in terms of time scale and the nature of the data they treat. ESPERE, an MS Excel application, uses several different commonly-used methods to rapidly and simultaneously estimate recharge. It makes it possible to quantify recharge with a monthly and annual time step and to vis...

This paper presents an inverse modeling method based on wavelet analysis, devoted to assessment of the impacts of climate change on the groundwater resources of a confined coastal multi-layer aquifer, located in the south of France (Pyrénées-Orientales). The hydraulic behavior of the aquifer is described based on the results of a model calibrated t...

Shaping global change adaptation strategy in water resource systems requires an interdisciplinary approach to deal with the multiple dimensions of the problem. The modelling framework presented integrates climate, economic, agronomic and hydrological scenarios to design a programme of adaptation measures at the river basin scale. Future demand scen...

Although nowadays groundwater resources are mostly affected by increasing water abstraction, they will have to face the impact of climate change. Even in a temperate climate as the one in northern France these two drivers will have strong impact on the aquifers. Evolution of groundwater resource is most often studied based on evolution of the rainf...

Karst systems constitute aquifers in which infiltration and groundwater flows are generally complex processes and are characterized by limited knowledge in terms of geometry and structure. Nonetheless, they often represent interesting groundwater resources, some of them being subjected to intensive exploitation and others non exploited due to their...

Le changement climatique augmente l'incertitude liée aux activités agricoles car il constitue un aléa qui vient s'ajouter aux nombreux facteurs de l'environnement dont dépend l'agriculture. C'est particulièrement vrai en zone méditerranéenne. Une démarche de prospective participative a été engagée dans le Roussillon. Différents acteurs du monde agr...

In the French Western Pyrenees, the trend to the decrease of low water flows that has been observed during the current years should be going on in the future. This may increase the hydric stress on aquatic ecosystems, and the competition among water uses and users for accessing water resources. The research project ANR-VULCAIN compared the impacts...

Local groundwater levels in South India are falling alarmingly. In the semi-arid crystalline Deccan plateau area, agricultural production relies on groundwater resources. Downscaled Global Climate Model (GCM) data are used to force a spatially distributed agro-hydrological model in order to evaluate Climate Change (CC) effects on local groundwater...

We discuss methodological issues related to the development of long term future agricultural water demand scenarios. We present the results of original research which combines the use of scenario workshops with quantitative crop water requirement modeling approaches. Using a Southern France case study, we describe four scenarios, debated with farme...

The cumulative distribution function transform (CDF-t) is used to downscale daily precipitation and surface temperatures from a set of Global climate model (GCM) climatic projections over southern India. To deal with the full annual cycle, the approach has been applied by months, allowing downscaled projections for all seasons. First, CDF-t is vali...

One of the main challenges in the implementation of the Water Framework Directive (WFD) in the European Union is the definition of programme of measures to reach the good status of the European water bodies. In areas where water scarcity is an issue, one of these challenges is the selection of water conservation and capacity expansion measures to e...

This article presents a case study which illustrates how an integrated hydro-economic model can be applied to optimize a program of measures (PoM) at the river basin level. By allowing the integration of hydrological, environmental and economic aspects at a local scale, this model is indeed useful to assist water policy decision making processes. T...

This study is focused on the western part of the French Mediterranean area, namely the Pyrénées-Orientales and Aude administrative departments. The water resources (surface and groundwater) in the region are sensitive to climate change. The study addresses the question of whether any trend in the annual and monthly series of temperature, rainfall a...

Vulnerability assessment is in growing demand in policy circles in order to choose adapted measures and policies to reduce vulnerability of water users and resources. Within the SHIVA ANR project, we present a method to first assess and map the vulnerability of South-Indian farmers to both climate and socioeconomic changes, and second assess the co...

This paper describes how participatory foresight methodologies can be used to identify long term (2050) agricultural impacts of increasing water scarcity and drought risk aw well as adaptive strategies. It is based on a case study conducted in Mediterranean Southern France as part of two long term research projects on hydro-climatic change. The met...

Output atmospheric fields from seven global climate models (GCMs) were extracted over a domain covering the Adour-Garonne basin in southwestern France in order to calculate precipitation and temperature anomalies for the decade 2050–2060 relative to the present climate. These anomalies showed a general trend of increasing precipitation in wintert...

In a continuing effort to test the behavior of Meteo France’s land-surface scheme, Interaction Soil Biosphere Atmosphere (ISBA), under a wide range of hydrometeorological conditions, the scheme was applied to a small tropical high-mountain river basin of the Cordillera Real in Bolivia. The surface scheme simulates the key hydrological processes, su...

Water management modelling of a hydroelectric system in a tropical high mountain context is presented. The study zone and the hydraulic network are described and the water management strategy analysed. Three different models are combined to describe the complexity of the specific hydrometeorological context: the spatial distribution of the climatic...