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Patrick Lachassagne

Patrick Lachassagne
Université de Montpellier CNRS IRD IMT Mines Alès · UMR HydroSciences Montpellier

Dr, HDR

About

155
Publications
51,717
Reads
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2,679
Citations
Citations since 2016
54 Research Items
1419 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Introduction
Hydrogeologist Main research area: hard rock aquifers hydrogeology Also: volcanic aquifers, mineral and thermal waters
Additional affiliations
November 2019 - present
Université de Montpellier
Position
  • Managing Director
June 2008 - November 2019
Danone Waters Evian
Position
  • Group Leader
December 1995 - June 2008
French Geological Survey
Position
  • Head of Department
Education
October 1987 - December 1989
Paris School of Mines
Field of study
  • Quantitative Hydrology and hydrogeology

Publications

Publications (155)
Article
Full-text available
Artesian aquifers offer interesting opportunities for water supply by providing a low-vulnerability groundwater resource that is easily abstracted without any installation of pumps or power supply costs. However, hydraulic tests are challenging to perform, notably where the piezometric head is above ground level with free-flowing wells not equipped...
Conference Paper
Topic 2.k. Hydrogeology and hydrogeologists from Sahelian countries: specific challenges for the achievement of SGD targets.
Article
Full-text available
Study region Water resource management relies fundamentally on our ability to monitor climate forcing variability, especially in tropical mountainous environment where the temporal and spatial variability of rainfall strongly controls the dynamics of the water resource. In West Java Island, rainfall temporal and spatial distribution significantly v...
Article
Full-text available
Statistical analysis of a borehole database, linear discharges, and water strikes processing enabled an understanding of the structure, geometry and hydrodynamic properties of the metamorphic hard rock aquifers from the Montagnes District, Western Côte d’Ivoire. The database comprises 1654 boreholes among which 445 only were usable for this researc...
Article
Full-text available
Statistical analysis of a borehole database, linear discharges, and water strikes processing enabled an understanding of the structure, geometry and hydrodynamic properties of the metamorphic hard rock aquifers from the Montagnes District, Western Côte d’Ivoire. The database comprises 1654 boreholes among which 445 only were usable for this researc...
Article
Full-text available
While basaltic volcanic aquifers are well described in the literature, andesitic groundwater systems are less studied. Nevertheless, these aquifers supply a large population in all the subduction areas, where this volcanism mainly occurs. In Indonesia, the growing needs of the population induce an increase of the pressure on such aquifers. We prese...
Article
Full-text available
Overview of how groundwater relates to water security.
Article
Full-text available
The African continent is probably the one with the lowest density of hydrometric stations currently measuring river discharge despite the fact that the number of operating stations was quite important until the 1970s. This new African Database of Hydrometric Indices (ADHI) provides a wide range of hydrometric indices and hydrological signatures com...
Article
Full-text available
Among the water resources on Earth, groundwater is a resource hidden in the rocks of the Earth’s crust. For various reasons, notably the fact that this water is not directly visible, but also as a consequence of education and longstanding traditions, the properties and physical laws governing groundwater are not well known outside the circle of hyd...
Article
Full-text available
Hard rocks (HR) or crystalline rocks (i.e., plutonic and metamorphic rocks) constitute the basement of all continents, and are particularly exposed at the surface in the large shields of Africa, India, North and South America, Australia and Europe. They were, and are still in some cases, exposed to deep weathering processes. Since about 15 years, i...
Preprint
Full-text available
The African continent is probably the one with the lowest density of hydrometric stations currently measuring river discharge, despite the fact that the number of operating stations was quite important until the 70s. This new African Database of Hydrometric Indices (ADHI) is compiling data from different sources carefully checked for quality contro...
Article
Study region: The Bromo-Tengger volcanic aquifer system, (East Java, Indonesia). Study focus: Andesitic volcanic aquifers in Indonesia are an important source of groundwater supply for the population. The artesian flow from high discharge springs facilitates the access for irrigation and drinking water but continuously flowing artesian wells exert...
Poster
The precise estimation of aquifers’ recharge, and location of their recharge area, is mandatory both to preserve (quality) and manage (quantity) groundwater resources. We thus present in this study a methodology aiming at quantitatively assessing and locating aquifer’s recharge areas. It combines the use of the stable isotopes local meteoric water...
Article
Full-text available
Among the processes controlling landslide dynamics, piezometry plays a major role. The characterization of a landslide’s aquifer recharge (=inflows) is thus indispensable for predicting displacements. In this research, the recharge of the large Grand Ilet landslide in the humid tropical, Reunion Island was characterized through a multi-disciplinary...
Conference Paper
Le complexe volcanique du Bromo-Tengger comprend différentes sources minérales exceptionnelles et correspond par ailleurs à la zone de recharge de la plaine volcano-sédimentaire localisée au Nord du volcan. Cet aquifère artésien alimente en eau potable les populations locales mais est également utilisé pour l’irrigation des cultures. Les écoulement...
Conference Paper
Présentations of the Danone Waters’ principles and realizations in Water Stewardship from all over the world (France, Indonesia, Argentina...).
Conference Paper
The water temperature of high discharge aquifers is a useful indicator of the aquifer structure and hydrodynamical behaviour. In particular, aquifers with anomalously low temperature imply that their recharge area occurs upstream, at high altitude where the mean air temperature is significantly lower than that of the observed output. This unusual t...
Chapter
Full-text available
Les roches cristallines ou roches « de socle » sont des roches en général anciennes, de deux types principaux : les roches plutoniques, telles que les granites, et les roches métamorphiques, comme les gneiss, schistes, micaschistes... Elles constituent le soubassement de l'ensemble des continents et y sont donc très communes. Leurs propriétés hydro...
Article
This research aims to quantify the geophysical signature of the laminated layer, one of the main layers constituting the weathering profile of hard rocks. This laminated layer acts as a marker for locating the underlying groundwater productive stratiform fractured layer (SFL). The study is based at two sites on the interpretation of 50 km of electr...
Article
The acquisition of a permeability high enough to constitute an aquifer in crystalline rocks is a result of physico-chemical weathering through the transformation of minerals by the chemical processes of oxidation and hydration. The volumetric changes resulting from hydration induce stresses that fracture unweathered rocks. These reactions are exoth...
Conference Paper
Regulatory framework for natural mineral waters in Europe Research Activities to understand the structure and functioning of aquifers, develop management tools, etc. and Voluntary Actions, such as protection actions, implemented by bottling companies to sustainably manage and protect this patrimony
Article
The behaviour of transient flow due to pumping in fractured rocks has been studied for at least the past 80 years. Analytical solutions were proposed for solving the issue of a well intersecting and pumping from one vertical, horizontal or inclined fracture in homogeneous aquifers, but their domain of application—even if covering various fracture g...
Conference Paper
Thermo-mineral and carbo-gaseous (TMCG) systems have an important economic importance for sparkling water bottling as well as for spa activities (therapeutic applications, wellness, etc .). We present a comprehensive research based on a mutidisciplinary approach (geology, hydrodynamics, geochemistry, isotopes, datations, etc.). Its converging resul...
Chapter
Full-text available
L’eau minérale naturelle est une eau exclusivement d’origine souterraine, captée soit à une source, soit par forage. Définie en tant que telle par la réglementation, elle est utilisée pour l’embouteillage et/ou le thermalisme. Pure, protégée géologiquement et présentant une composition minérale parfaitement stable, elle ne fait l’objet d’aucun trai...
Conference Paper
Full-text available
The discovery, during the last 1990s, of a thick fractured layer below the saprolite in lateritic profiles developed on crystalline rocks has resulted in a redefinition of hardrock aquifers. During the first 2000s, numerous researches were conducted in different continents in order to validate the new concept of stratiform hardrock aquifer linked t...
Conference Paper
Hard Rocks (HR) or crystalline rocks, i.e. plutonic and metamorphic rocks, constitute the basement of all continents, and are particularly exposed at the surface in the large shields of Africa, India, North and South America, Australia, large parts of Eurasia, etc.. Well yields from hard rock aquifers are modest compared to those from other types o...
Conference Paper
Crystalline thermo-mineral and carbo-gaseous (CTMCG) hydrosystems are well known for their economic importance in fields such as thermal, spa activities and natural mineral water (NMW) bottling. Such systems are usually associated with a strong structural complexity, which is rarely characterized in detail or robustly. This research focused on a CT...
Article
Hard Rock Aquifers (HRA) have long been considered to be two-layer systems, with a mostly capacitive layer just below the surface, the saprolite layer and a mainly transmissive layer underneath, the fractured layer. Although this hydrogeological conceptual model is widely accepted today within the scientific community, it is difficult to quantify t...
Presentation
Full-text available
Crystalline thermo-mineral and carbo-gaseous (CTMCG) systems are associated to specific geological structures, such as faulted bedrock, allowing the upward flow of deep hot/mineral fluids and/or gases. Although conceptual models based on groundwater flow through faults can be relevant, the 3-D extension and hydraulic properties of such aquifers exp...
Presentation
Full-text available
The survey of groundwater resources, including natural mineral water, requires the use of geophysical methods. In hard rocks, electrical resistivity tomography (ERT) is commonly used to image the structures associated to the weathering, i.e. the saprolite and the stratiform fissured layer, and deeper discontinuities, the stratiform fissured layer b...
Article
Full-text available
Crystalline thermo-mineral and carbo-gaseous (CTMCG) hydrosystems are well known for their economic importance in fields such as thermal, spa activities and natural mineral water (NMW) bottling. Such systems are usually associated with strong structural complexity, which is rarely characterised in detail or robustly. This research focuses on a CTMC...
Presentation
Full-text available
Danone Aqua is one of the biggest bottled drinking water producers in Indonesia that utilizes mostly quaternary volcanic aquifer resources. This paper objective is to show the findings about aquifer parameters from numerous drilled wells all over Indonesia in such a hydrogeological context. A total of 40 exploitation bore-wells were drilled in vari...
Conference Paper
Full-text available
RouquetSimon,Water Institute by Evian-Danone Waters-Evian Volvic World, Evian cedex , France KEYWORDS: pseudo 3D modelling, volcanic aquifer, non darcean flow The detailed study and numerical modeling of a volcanic aquifer (Volvic area, Chaîne des Puys, France) reveals piezometric discontinuities in the aquifer where the Darcy law do not apply. The...
Presentation
Full-text available
In hard rocks, and particularly in the metamorphic context, borewell siting for groundwater abstraction is complex. Consequently the failure rate is currently higher than in other hard rock contexts. In this study, we valorize the experience of more than 10 years of surveys aiming at prospecting for new natural mineral water resources in the Southe...
Presentation
Full-text available
Survey of groundwater resources, especially in hard rock context, requires the use of geophysical methods. In this context, electrical resistivity tomography (ERT) is commonly used to image the structures associated to the weathering: the saprolite and the stratiform fissured layer, and deeper discontinuities. However, the geological and hydrogeolo...
Poster
Full-text available
The hydrogeology of volcanic islands is deeply studied and precisely described, with the major goal of providing and managing water resources for populations. Modern hydrogeological conceptual models of basaltic volcanic islands are essentially based on studies concerning lava flows aquifers, yet breccia deposited by debris avalanches represent a s...
Book
Full-text available
Are forests beneficial or prejudicial to the functions and uses of water? Is it possible to concomitantly sustain forestry activities and to protect downstream water uses, particularly drinking water supply? For most scientists and practitioners, but also for a wider audience, woodland areas benefit from a very positive image. In fact, they often m...
Chapter
In quantitative terms, forest, like other forms of land cover, and in particular vegetation, has a very significant influence on the fate and the hydrological distribution of rainwater. Against this background, this chapter will aim to (1) present, in an informative manner, the quantitative hydrological processes associated with the water cycle, fr...
Chapter
The forest of the Furan watershed is the site of a large part of the drinking water resource for the town of Saint-Etienne (Loire, France). This resource has been collected since the end of the 19th century using shallow drains under the soil surface (generally between 1.3 and 2.3 m deep). Within the framework of the LIFE+SEMEAU European project, a...
Chapter
Nitrates, which belong to the nitrogen biogeochemical cycle, are naturally present in surface and groundwater. They come from direct atmospheric inputs and mineralisation, then from the leaching of organic matter. They are also one of the main markers of agricultural activities, with concentrations that may reach or exceed drinking water standards...
Chapter
European regulations most notably define Natural Mineral Water (NMW) on the basis of the purity and stability of its mineral composition. Purity requires excellent natural geological protection of the mineral aquifers, while stability means those aquifers also have to present high hydrogeological inertia. Over the long term, these two characteristi...
Chapter
In quantitative terms, forest, like other forms of land cover, has a very significant influence on the fate and the hydrological distribution of rainwater and thus on water resources. This book demonstrates that two main antagonistic – and usually successive – effects come up against one another: 1. Negative effect on water resources: compared to o...
Chapter
Stakeholders in water policy generally think that “the forest protects water” and that this “protective cover” is a gift from nature in that it does not require any special management efforts to fulfil its protective role. This view may lead them to believe that the forest is a non-issue for them. The outcome is “polite indifference” and distant re...
Chapter
Natural mineral water springs are concentrated in the area around the town of Vals-les-Bains, characterised by a crystalline and cristallophyllian fractured basement. Chemical analyses of more than thirty samples, performed in April 2011, showed that all the waters present the same sodic bicarbonated facies, perfectly described by the mixing of a c...
Conference Paper
Full-text available
Hard Rocks (HR; plutonic and metamorphic rocks) constitute most of the emerged continents, as in shields areas of Africa, India, North and South America, Australia, Europe, etc. They are or were exposed to deep weathering processes. The result is weathering profiles which, when not later partly or totally eroded, can reach a thickness of several te...
Conference Paper
Full-text available
The Saint-Galmier (Massif central, France) CO2 rich natural mineral waters are known and drunk at least since the Roman times and are bottled since more than two centuries under the "Badoit" sparkling mineral water brand (Danone Group). A synthesis, processing, and interpretation of a large data set from this hydrogeological area has been performed...