Nicolas Patris

Laboratoire HydroSciences Montpellier

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J.D. Taupin

Laboratoire HydroSciences Montpellier

Jean‐Denis Taupin

Laboratoire HydroSciences Montpellier

Christian Leduc

Université de Montréal

Mohsen Ben Alaya

Institut National de Recherches et d'Analyses Physico-chimiques

Marjorie Kreis

Fundação Cearense de Meteorologia e Recursos Hídricos

Eduardo Sávio Passos Rodrigues Martins

Universidade Federal do Ceará

Patrick Ginot

Université Grenoble Alpes

Patrick Lachassagne

Laboratoire HydroSciences Montpellier

Christelle Batiot‐Guilhe

Université de Montpellier

Christophe Bouvier

Institut de Recherche pour le Développement

Cooperative Institutions

Centre National de la Recherche Scientifique

138

Institut de Recherche pour le Développement

105

Université de Montpellier

Laboratoire HydroSciences Montpellier

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

Milieux environnementaux, transferts et interactions dans les hydrosystèmes et les sols

Maison des Sciences de l'Homme

Université Grenoble Alpes

Laboratoire de Glaciologie et Géophysique de l’Environnement

Institut des Géosciences de l'Environnement

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Ice core study in Patagonia (San Valentin, 47°S) over the last century

EGU General Assembly Conference Abstracts (2009)

J. Herreros Jean‐Denis Taupin Nicolas Patris Isabel Moreno Patrick Ginot

Ice core

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Using geochemical and isotopic tracers to characterize groundwater dynamics and salinity sources in the Wadi Guenniche coastal plain in northern Tunisia

Journal of Arid Environments (2020)

Safouan Ben Ammar Jean‐Denis Taupin Mohsen Ben Alaya Kamel Zouari Nicolas Patris

Wadi

Environmental isotopes

δ18O

Coastal plain

10.1016/j.jaridenv.2020.104150

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Citations (31)

Isotope study of monthly rainfall and its response in the Santos Formation phreatic aquifer, Mesa de Los Santos, Santander (Colombia)

Proceedings of the International Association of Hydrological Sciences (2024)

Maria Alejandra Cetina Jean‐Denis Taupin Sully Gómez Nicolas Patris

Abstract. Mesa de Los Santos is an elevated plateau located in the Eastern Cordillera of Colombia (Andean region) in the Department of Santander (altimetric variation 300 to 1800 m a.s.l.). The region is marked by a shortage of potable surface water. The isotopic study of the rain and its relation to Los Santos Formation phreatic and fractured aquifer was carried out. Four rain stations were installed on top of the plateau (1275 to 1684 m a.s.l.) to collect monthly rainwater samples for stable isotopes. The rainwater stations recorded 1469 to 764 mm from North to South, and the seasonal patterns of stable isotopes were similar in all stations. The preliminary Local Meteoric Water Line is δ2H = 8.22×δ18O + 13.9, slightly above the GMWL with an intercept of +13.9 ‰, possibly indicating continental vapor recycling. The rain-weighted annual isotope means showed more depleted values in the southmost rain station (δ18O = −8.99 ‰, 1275 m a.s.l.). From the phreatic and fractured aquifer, 35 groundwater points were monitored bimonthly for stable isotopes (n=134) and three trends were differentiated in the isotopic content value of δ18O. Large temporal variability characterized 10 groundwater points (amplitudes greater than 1 ‰ in δ18O for each point) consistently with the seasonal behaviour of the rain, indicating flows with rapid transit on a monthly scale. 21 groundwater points showed a low temporal variability with year-round differences under 1 ‰ and presenting a spatial distribution of δ18O with enriched values towards the north (between −6.71 ‰ and −6.00 ‰) and depleted values towards the south (−8.97 ‰ to −8.14 ‰), which tends to be also consistent with the rainwater isotope distribution observed. The stability of year-round groundwater isotopic values is a sign of efficient mixing of groundwater and a slower transit. Finally, 4 groundwater points presented signs of evaporation, showing d-excess values between −6.4 ‰ and +4.3 ‰, in connection with surface water bodies that undergo evaporation before infiltration.

Phreatic

Rainwater Harvesting

δ18O

10.5194/piahs-385-231-2024

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Origin and dynamics of spring flows during flood events inferred from innovative tracers

HAL (Le Centre pour la Communication Scientifique Directe) (2016)

Véronique de Montety Sarah Tweed Arnold Molina Porras J.L. Seidel Christelle Batiot‐Guilhe

Understanding the dynamics of flow and recharge processes is crucial information for managing water resources. However, this is challenging in heterogeneous systems, e.g. karst, due to the strong spatial variability in flow pathways. In addition, the evolution of mixing at the event-scale is rarely characterized with sufficient details to constrain or validate hydrodynamic models. The objectives of this study were to (1) identify event-scale variations in contributions from different flow pathways to a karst spring, and (2) better constrain the response of spring dynamics to the spatio-temporal variability of flood events. The study focuses on the main spring (Lez spring) of a Mediterranean karst aquifer near Montpellier (SE France), which is subject to intense autumn rainfall events. We used innovations in (1) the continuous and high frequency monitoring of tracers (delta18O, delta2H, and natural fluorescence+ humic and proteic-like compounds), and (2) the types of tracers monitored (natural and anthropogenic dissolved gases, radon and radium isotopes, 3D-fluorescence and total organic carbon). Three rainfall events highlighted distinct spring chemical responses. The first event was characterized by a contribution of deep groundwater flow (low CFC contents, low (228Ra 226Ra) ratios and low organic carbon concentrations) resulting from a piston flow effect due to heavy rainfalls at the basin margins. The second event showed a proteic peak associated with a sharp decline in DO concentrations and an anomalous peak in delta18O. The third event was characterized by a dilution effect by subsurface waters (CFC contamination, high turbidity and radon peak) due to high local rainfall. The simultaneous monitoring of these tracers during multiple rainfall events provides an innovative approach in spring dynamics analysis, and improves our understanding of a complex hydrogeological system. The Lez spring supplies drinking water for Montpellier, therefore understanding the variability of water origins and potential contamination pathways during intense storm events is essential.

TRACER

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Dual Geochemical and isotopic approach to study the functioning of the Gabes South phreatic aquifer (south-eastern Tunisia).

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

Alaya A. Ben Ammar S. Ben Cheikh N. Ben K Wederni Mohamed Khouatmia

Phreatic

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Multi-scale hydrometeorological observation and modelling for flash flood understanding

Hydrology and earth system sciences (2014)

Isabelle Braud Pierre-Alain Ayral Christophe Bouvier Flora Branger Guy Delrieu

Abstract. This paper presents a coupled observation and modelling strategy aiming at improving the understanding of processes triggering flash floods. This strategy is illustrated for the Mediterranean area using two French catchments (Gard and Ardèche) larger than 2000 km2. The approach is based on the monitoring of nested spatial scales: (1) the hillslope scale, where processes influencing the runoff generation and its concentration can be tackled; (2) the small to medium catchment scale (1–100 km2), where the impact of the network structure and of the spatial variability of rainfall, landscape and initial soil moisture can be quantified; (3) the larger scale (100–1000 km2), where the river routing and flooding processes become important. These observations are part of the HyMeX (HYdrological cycle in the Mediterranean EXperiment) enhanced observation period (EOP), which will last 4 years (2012–2015). In terms of hydrological modelling, the objective is to set up regional-scale models, while addressing small and generally ungauged catchments, which represent the scale of interest for flood risk assessment. Top-down and bottom-up approaches are combined and the models are used as "hypothesis testing" tools by coupling model development with data analyses in order to incrementally evaluate the validity of model hypotheses. The paper first presents the rationale behind the experimental set-up and the instrumentation itself. Second, we discuss the associated modelling strategy. Results illustrate the potential of the approach in advancing our understanding of flash flood processes on various scales.

Flash flood

Hydrometeorology

Hydrological modelling

Water cycle

Temporal scales

10.5194/hess-18-3733-2014

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Geochemical and isotopic characterization of surface river-alluvial groundwater relationships in a high altitude semi-arid basin, Elqui (Chile)

HAL (Le Centre pour la Communication Scientifique Directe) (2016)

Christelle Batiot‐Guilhe Jonathan Pourrier J.D. Taupin Nicolas Patris Hervé Jourde

Geochemical and isotopic tools are used to trace surface water groundwater interactions, which are major recharge processes for alluvial aquifers, especially in arid zones. In this context, geochemi cal characteristics of surface and ground waters should be strongly linked. Nevertheless, geochemical signatures can be very complex in valleys, especially in volcanic contexts where different processes are involved such as rock weathering, mixing with geothermal fluids or dissolution of particular minerals producing specific geochemical facies. The study area (upper Elqui valley and tributaries) is located in Chilean Andes (800 - 5500 m). The upper zone (> 3000 m) comprises various volcanic rocks including locally mineral-rich areas (El Indio Gold Belt) and is supplied by several glaciers including the Tapado (HCO3-Ca hydrochemical facies) and rock glaciers (SO4-Ca hydrochemical facies), with increasing mineralization from upper to lower parts of the bas in (EC from 150 to 630 IS.cm-1). In zones including mining activities (El Indio mining) or mineral-rich terrains, increases in mineralization (up to 4000 IS cm), acidification (pH <4) and high concentrations of metallic elements are observed in surface waters. The lower part of the basin is composed of plutonic rocks and detrital terrains in which alluvial aquifers are developed. The hydrochemical facies of tributaries is HCO3 -Ca, but the major river retains the SO4-Ca signature acquired in the upper part of the basin. All through the alluvial aquifer, hydrochemical and isotopic characteristics of surface waters and ground waters generally show good relationship, highlighting a good connectivity between these two compartments. Nevertheless, isotopic values of some tributaries can be different and contrasted compared to others as a function of the origin of water (from glaciers, rain and or snow). Radon measurements have shown some possible contributions from plutonic rocks. This mutitracer approach coupled wi th hydrodynamic information allow to better characterize surface water groundwater interactions, which are complex to identify but are fundamental to optimize the integrated water resources management in arid contexts at middle to high altitudes.

Alluvial fan

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First sulfur isotope measurements in central Greenland ice cores along the preindustrial and industrial periods

Journal of Geophysical Research Atmospheres (2002)

Nicolas Patris Robert J. Delmas Michel Legrand M. de Angelis Francisco Adolfo Ferron

Sulfur isotopes of sulfate have been measured in a discontinuous set of polar ice core samples from Summit, central Greenland, covering the preindustrial (from the fourteenth to the eighteenth century) and industrial (from 1872 to 1969 A.D.) periods. Results have been used to estimate the different source contributions to the deposited sulfate and their evolution along the last centuries. They indicate that the preindustrial background sulfate budget is slightly dominated on a year‐round average by marine biogenic emissions, amounting to close to half of the non‐sea‐salt sulfate (49%). The second contribution is provided by continental sources of secondary sulfate, including background volcanism and, to a lesser extent, continental biota (44% of the non‐sea‐salt sulfate). Sulfur emitted by relatively weak eruptions is found to be largely depleted in 34 S compared to bulk volcanic S, suggesting an efficient washout of the heavier isotope during the tropospheric transport. The impact of human‐driven emissions on the sulfate deposited in central Greenland ice is visible in isotope data as early as 1870 A.D. The isotopic signature of anthropogenic sulfur deposited during the twentieth century is found to be constant (δ 34 S ≈ +3.0 ± 1.5‰), regardless of the changes of dominant source regions and emission processes. This signature is slightly but measurably lighter than the one reported for Arctic haze pollution events.

Ice core

Sulfate aerosol

Groenlandia

δ34S

Sulfur Cycle

10.1029/2001jd000672

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Citations (98)

Tree xylem isotope analysis by mass and laser spectrometry

Simon Carrière Nicolas Martin‐StPaul Coffi Belmys Cakpo Nicolas Patris Marina Gillon

Tree (set theory)

Isotope Analysis