Frederic Huneau

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• Professor
• Professor (Full) at University of Corsica Pascal Paoli

Several groundwater quality investigations have been conducted in coastal regions that are commonly exposed to multiple anthropogenic stressors. Nonetheless, such studies remain challenging because they require focused-diagnostic approaches for a comprehensive understanding of groundwater contamination. Therefore, this study integrates a multi-trac...

Stable isotope values of δ15NNO3 and δ18ONO3 of dissolved nitrate (NO3) are commonly used to identify the occurrence of denitrification as there is a progressive increase of δ15NNO3 and δ18ONO3 values accompanied by a decrease in NO3 concentration. Thus, denitrification results in a positive trendline on the dual plot of δ18ONO3 versus δ15NNO3. The...

Groundwater, widely used for supplying drinking water to populations, is a vital resource that must be managed sustainably, which requires a thorough understanding of its diverse physico-chemical and bacteriological characteristics. This study, based on a 27-year extraction from the Sise-Eaux database (1993–2020), focused on the island of Corsica (...

Cyclones, whether tropical, extratropical, or of Mediterranean origin, play a crucial role in the Earth’s climate system, affecting environments and populations through strong winds, heavy rainfall, and flooding. While much research has focused on tropical and extratropical cyclones, Mediterranean cyclones have received less attention. These cyclon...

The insufficient taking into account of groundwater as a basis for implementing protection measures for coastal wetlands can be related to the damage they are increasingly exposed to. The aim of this study is to demonstrate the pertinence of combining hydrogeological tools with assessment of pollutant fluxes and stable isotopes of O, H and N, as we...

The groundwater contained in the basement formations of sub-Saharan countries is the main source of drinking water for the population in rural and semi-rural areas. Captured by boreholes and wells, it is used for domestic purposes, irrigation, and other socioeconomic activities. Given the increased pressure on the resource due to population growth...

This study provides insights into factors that influence the water balance of selected European lakes, mainly in Central Europe, and their implications for water quality. An analysis of isotopic, chemical and land use data using statistical and artificial intelligence models showed that climate, particularly air temperature and precipitation, playe...

In this paper, two methods of mapping and assessment of the intrinsic vulnerability in porous media were applied to an urban case study relevant to illustrate the specificities and difficulties of African megacities concerning the management of the quality of the drinking water supply from groundwater. GOD and DRASTIC models have been used to map t...

Global‐scale estimates of carbon fluxes from satellite data‐driven models are constrained by considerable uncertainties regarding Gross Primary Production (GPP) and the lack of the watershed‐scale measurements required for model calibration. Recently conducted global modelling efforts indicate that semiarid ecosystems dominate the increasing trends...

With the neo-metamorphosis of the residential landscape worldwide and sluggish sanitation strategies in urban environments, rudimentary on-site sanitation systems remain commonly used, especially in developing countries, despite the risks of groundwater contamination. The effective management of such water resources relies on assessment of the sens...

This contribution points out that while the importance of hydrologic, geomorphic, ecological, temporal, and socio‐cultural connectivity in the functioning of hydrosystems has been acknowledged in three dimensions (longitudinal, lateral, and vertical), vertical connectivity has often been overlooked. Drawing on a multidisciplinary literature review,...

A multi-tracer approach has been implemented in the southwestern part of the Lake Chad Basin to depict the functioning of aquifers in terms of recharge, relationship with surface water bodies, flow paths and contamination. The results are of interest for sustainable water management in the region. The multi-layered structure of the regional aquifer...

In Central Africa, groundwater remains the least understood component of the water cycle. Isotopic techniques that are well known to be efficient in tracking the movement of water along its path have been applied for only three decades and can be summarized in a handful of case studies. This review aims to put together all the stable and radioactiv...

The cross-referencing of two databases, namely the compartmentalization into groundwater bodies (GWB) and the quality monitoring (2830 observations including 15 physico-chemical and bacteriological parameters, on 662 collection points and over a period of 27 years) is applied to better understand the diversity of the waters of the island of Corsica...

In coastal salinized groundwater systems, contamination from various nitrate (NO 3) inputs combined with complex hydrogeochemical processes make it difficult to distinguish NO 3 sources and identify potential NO 3 transformation processes. Effective field-based NO 3 studies in coastal areas are needed to improve the understanding of NO 3 contaminat...

Despite being a vector of pollution towards connected ecosystems, groundwater is often underestimated or not taken into account in management frameworks. To fill this gap, we propose to add socio-economic data to hydrogeological investigations to identify past and present pollution sources linked to human activities at watershed scale in order to f...

Understanding the hydrogeological functioning of aquifers is essential in contexts where waterresources are intensively used. Moreover, climate change can have long-term effects on groundwater in terms of availability, residence and transit times. Thus, careful management ofgroundwater resources require the understanding of the aquifer’s characteri...

Key message Black pine and Maritime pine exhibit considerable differences in growth phenology across elevation belts with a 1-month delay for xylogenesis and increasing growth rates from low, mid to high elevations. Abstract Investigating seasonal wood formation is crucial to understand tree growth responses to climate impact. The present study qu...

The primary goal of paleoflood hydrology is to estimate the frequency and magnitude of past floods. Botanical evidence, and particularly scars on trees, has been used repeatedly as paleostage indicators to reconstruct peak discharges and flood height. Yet, these reconstructions depend on the presence of visible scars on tree stems which tend to be...

Mediterranean coastal lagoons are affected by multiple threats (demographic pressures, eutrophication, climate change) expected to increase in the future and impact the ecosystem services provided. Conservation norms and scientific studies usually focus on large lagoons (> 0.5 km ² ) due to their economic importance, while they ignore smaller lagoo...

Shallow groundwater resources, especially in hard rock environment, constitute an important part of urban water supply in developing countries, appropriate to the low level of economic development. However, increasing urban population and dependence on shallow groundwater systems make it imperative to evaluate the availability and the contamination...

The current research of carbon cycling in inland waters lacks a sound knowledge of carbon outgassing from small streams. As a consequence, these compartments of the terrestrial water cycle might still be seriously underrepresented in estimates of global carbon transfer budgets from land surfaces. This study investigated carbon sources and sinks of...

While studies of the spatial distribution of precipitation isotope contents is well known at large scale and for more or less homogeneous areas, regions with complex topography and aerology are more sparsely or not at all documented. The aim of this research is to understand the factors influencing spatial/temporal changes of isotopes content in...

Peatlands are permanent wetlands recognized for ecosystem services such as biodiversity conservation and carbon storage capacity. Little information is available about their response to global change, the reason why most Earth system climate models consider a linear increase in the release of greenhouse gases (GHG), such as CO2, with increasing tem...

Implementing sustainable groundwater resources management in coastal areas is challenging due to the negative impacts of anthropogenic stressors and various interactions between groundwater and surface water. This study focuses on nitrate contamination and transport via groundwater-surface water exchange in a Mediterranean coastal area (Guerbes-Sen...

This study focuses on coastal aquifers subject to uncontrolled land use development by investigating the combined effects of seawater intrusion and nitrate contamination. The research is undertaken in a Mediterranean coastal agricultural area (Plain of the El-Nil River, Algeria), where water resources are heavily impacted by anthropogenic activitie...

Within the Lake Chad Basin, the unconfined Quaternary aquifer offers permanent and easy access to water resources. This transboundary regional aquifer is shared by Chad, Niger, Nigeria and Cameroon and extends over ~500,000 km². Climatic conditions and repeated droughts as well as the intensification of agriculture in the region have multiple negat...

Along the West-African coast, groundwater is under several threats coming from both human activities and climate change. However, hydrogeological studies have so far been conducted in a piecemeal way, city by city. In this paper, a regional study was conducted along the Beninese coast, combining hydrogeochemistry and water stable isotopes. Monthly...

The objectives of this study are to characterize the input signal of a shallow carbonate aquifer in northeastern France and to clarify the recharge and groundwater mineralization processes, by analysing the chemical and isotopic (δ¹⁸O, δ²H) composition of rain and groundwater. The groundwater isotopic signature was very close to the calculated loca...

The present study first describes the variations in concentrations of 12 chemical elements in groundwater relative to salinity levels in Southern Quebec (Canada) groundwater systems, and then uses this data to develop an empirical predictive model for evaluating groundwater chemical composition relative to salinity levels. Data is drawn from a larg...

Snow deposition in the forest and consequent runoff during the snowmelt period are highly affected by the forest stand of the given catchment. Disturbed forest can accumulate more snow due to lower leaf area index, but the snow also melts faster due higher income of solar radiation. Between 2004 and 2008, part of Šumava Mts. (Black forest) range (C...

The lack of hydrological considerations in the existing protection statutes for small temporary wetlands has recently been pointed out as the main cause of their rapidly increasing disappearance. In the present study, we aim to demonstrate the interest of using the tools of isotope hydrology to obtain a rapid and cost effective understanding of the...

Palaeoclimatic evidence is necessary to place the current warming and drying trends of the Mediterranean region in a long-term perspective of pre-industrial variability. Annually resolved and absolutely dated climate proxies that extend back into medieval times are, however, limited to a few sites only. Here we present a network of long ring width...

Located in northeast Algeria, the coastal aquifer of the Plain of the El-Nil River constitutes a significant source of groundwater. It contains many municipal and private wells used for several purposes, including agriculture irrigation and drinking water. This paper describes a review of potential anthropogenic sources of groundwater contamination...

Lake Fetzara, a Ramsar-listed water body in Algeria, was the subject of several studies aiming to identify the source of its salinity and to better understand the mechanism by which mineralization of the lake takes place. The studies undertaken at Lake Fetzara site are justified by the fact that the salt-rich water of Lake Fetzara could potentially...

Located in northeast Algerian, the coastal aquifer of Taleza constitutes a significant source of groundwater. It contains hundreds of private wells installed by the population for several purposes including drinking water. Recently, the groundwater has become quite saline; in order to investigate this issue, hydrochemical and isotopic groundwater c...

Coastal Mediterranean lagoons are at the interface between continental and marine environments, they also represent the ultimate collector of hydrological and hydrogeological watersheds. They are fragile ecosystems and usually groundwater dependent. Coastal hydrosystems are threatened by increasing anthropogenic pressures inducing polluant fluxes w...

Understanding hydrogeological processes at the origin of thermal and mineral groundwater are necessary to ensure their sustainable management. However, many processes are involved in their genesis and often only one or two processes are investigated at the same time. Here, we propose to use an innovative combination of geochemical, isotopic (³⁴S, ¹...

The sustainable management of coastal lagoon hydrosystems is a key issue for the socio-economic and environmental development of many coastal areas worldwide. Often maintained by direct or indirect groundwater supplies, they provide a large range of ecosystem services, from which human societies take advantage. Twenty years after its implementation...

Stem radial variations of Corsican Black pine (Pinus nigra Arnold subsp. laricio Maire) and Maritime pine (Pinus pinaster Aiton) were monitored to quantify the impact of two meteorologically contrasting consecutive years. On the French island of Corsica, in the western Mediterranean basin, the year 2017 was extremely dry, while 2018 was exceptional...

Maximum latewood density (MXD) measurements from long-lived Black pines (Pinus nigra spp. laricio) growing at the upper treeline in Corsica are one of the few archives to reconstruct southern European summer temperatures at annual resolution back into medieval times. Here, we present a compilation of five MXD chronologies from Corsican pines that c...

The French Mediterranean island of Corsica is already today confronted with a clear tendency towards water shortage, leading not only to socio-economical, but also to ecological problems. A potential, but not very widespread source of water is the presence of near-ground clouds, mostly fog. In this study, we investigate fog-low stratus (FLS) freque...

Les sources thermo-minérales de Corse présentent une diversité géochimique et gazeuse unique au monde. Bien qu’elles soient exploitées (Orezza, Pietrapola, etc.), l’origine de ces eaux, l’origine de leur fraction gazeuse et la pérennité de leur gisements ne sont que très partiellement connues. Afin de garantir une GESTION DURABLE de ces ressources...

Quantification of the isotope altitude effect from precipitation allows to identify recharge altitudes in high-relief areas. However, steep terrains frequently limit the possibility of this precipitation-based approach. Perennial rivers often provide easy, year-round access for water sampling. However, in high-relief regions rivers may not adequate...

Using isotopic and hydrochemical tools, we focused our study on water and element fluxes with snowmelt in two headwater catchments with different forest stands. One catchment is with mature, and the other catchment is with forest regenerating after a tree dieback. Sampling and analysis of the surface water and precipitation throughout one hydrologi...

Deep groundwater circulation increases multiplicity and complexity of groundwater pathways providing a high diversity of intrinsic water properties. Water-rock interactions at depth associated with transit time disparities generate singular mineralisation with high temperature, notable dissolved ions and significant gaseous content. As shown in lit...

Groundwater is the main resource for irrigation and drinking supply in most parts of Syria, as for most Mediterranean countries, however this resource suffers from mismanagement. In the study area (northeast of Mt. Hermon), the lack of information makes water management in this area extremely difficult. Assessing groundwater pollution risk is the m...

Deep groundwater circulation increases multiplicity and complexity of groundwater pathways providing a high diversity of intrinsic water properties. Water-rock interactions at depth associated with transit time disparities generate singular mineralisation with high temperature, notable dissolved ions and significant gaseous content. As shown in lit...

As for most Mediterranean countries, groundwater is the main resource for irrigation and drinking supply in most parts of Syria, however this resource suffers from mismanagement. In the study area (Northeast of Mt. Hermon), the lack of information makes water management in this area extremely difficult. Assessing groundwater pollution risk is the m...

For climate models that use paleo-environment data to predict future climate change, tree-ring isotope variations are one important archive for the reconstruction of paleo-hydrological conditions. Due to the rather complicated pathway of water, starting from precipitation until its uptake by trees and the final incorporation of its components into...

In Mediterranean regions, the marked climatic seasonality and uneven precipitation distribution complicate the application of isotope mass balances to obtain meaningful basin‐wide annual average evaporation rates. In the present study, a mass balance approach carried out on the Tavignanu River watershed in Corsica (France), showed unrealistic evapo...

Mediterranean peatlands remain largely under-documented, except for detailed biological data such as fauna and flora taxa lists, and yet are increasingly threatened by water withdrawal and agriculture practices. This lack of information, particularly on their hydrogeological functioning, makes it impossible to evaluate their response to changing cl...

Humid equatorial regions are recognized as the least documented in termof hydrogeological functioning of aquifers despite the fact that they house a lot of developing countries and that groundwater is often the main water resource. Regarding this aspect, a study was conducted in sub-Saharan Africa, focusing on the Mio-Pliocene aqui- fer in Douala m...

Humid equatorial regions are recognized as the least documented in term of hydrogeological functioning of aquifers despite the fact that they house a lot of developing countries and that groundwater is often the main water resource. Regarding this aspect, a study was conducted in sub-Saharan Africa, focusing on the Mio-Pliocene aquifer in Douala me...

Les sources thermo-minérales de la Corse sont très diversifiées : Carbo-gazeuses, ferrugineuses et parfois même sulfureuses. Pietrapola, Puzzichellu ou Orezza, pour ne citer que les plus connues sont toutes d'un intérêt patrimonial majeur et sont pour certaines toujours exploitées. Toutefois, l'origine de ces eaux, leur parcours souterrain et leur...

Drought is a major factor limiting tree growth and plant vitality. In the Mediterranean region, the length and intensity of drought stress strongly varies with altitude and site conditions. We used electronic dendrometers to analyze the response of two native pine species to drought and precipitation events. The five study sites were located along...

This study investigates the multiple contamination sources of a coastal Mediterranean aquifer in northeastern Algeria that is bordered by two rivers and neighboring densely populated areas. Hydrogeochemical and isotopic groundwater characterization is carried out, including the analyses of major elements, water stable isotopes δ2H-H2O and δ18O-H2O,...

Water availability is the most important factor for the vitality of forest ecosystems, especially in dry environments. The Mediterranean region is one of the hotspots of future climate change; therefore, data on the water cycle are urgently needed. We measured oxygen isotope compositions in creek water, precipitation, stem water, needle water, and...

This study interprets 11 years (2006 to 2016) and 6 months (March to August in 2017) of respectively monthly and daily isotopic (δD and δ18O) monitoring of rain at Douala (Cameroon), a humid tropical station in Western Africa. The main scope is to analyze the climate controls on precipitation isotopes at different timescales. Firstly, we examine th...

The island of Corsica in the western Mediterranean is characterized by a pronounced topography in which local breeze systems develop in the diurnal cycle. In interaction with the large-scale synoptic situation, various precipitation events occur, which are classified in this study with regard to their duration and intensity. For this purpose, the i...

Climate models are in need of improved constraints for water vapor transport in the atmosphere, and tritium can serve as a powerful tracer in the hydrological cycle. Although the general principles of tritium distribution and transfer processes within and between the various hydrological compartments are known, variation on short timescales and asp...

Understanding water flow paths and chemical inputs from the catchment to downstream water bodies is essential for determining sensitivity and response of water resources to climatic, land use and environmental changes. Multivariate analysis of hydrochemical data and estimation of water balance using chloride as a chemical tracer, and oxygen and hyd...

Understanding water flow paths and chemical inputs from the catchment to downstream water bodies is essential for determining sensitivity and response of water resources to climatic, land use and environmental changes. Multivariate analysis of hydrochemical data and estimation of water balance using chloride as a chemical tracer, and oxygen and hyd...

Forest fires are an important factor shaping Mediterranean ecosystems and determine the distribution of different species. Information about past forest fires can be obtained with pyrodendroecology. Here, we present a fire history for three sites in the mountain forest belt on the island of Corsica in the Mediterranean Basin. The dating of scars fr...

Coastal lagoons deliver a wide range of valuable ecosystem goods and services. These ecosystems, that are often maintained by direct or indirect groundwater supplies, are collectively known as groundwater dependent ecosystems (GDEs). The importance of groundwater supplies is greatly exacerbated in coastal Mediterranean regions where the lack of sur...

Wetlands are key environments in watersheds with several essential hydrological functions such as flood mitigation, support for low water flow or improvement of water quality. Some of them, in particular, the peat bogs, are also known for their carbon storage capacity. Nevertheless, peat bogs are poorly studied in the Mediterranean while in such co...

Key message Intra-annual oxygen isotope patterns of tree-ring cellulose from Pinus nigra subsp. laricio and Pinus pinaster along an elevation gradient can be divided into four distinct patterns ((1) high values in the beginning of the tree ring, declining trend afterwards; (2) low values in the beginning, increasing trend afterwards; (3) high value...

Climate models are in need of improved constraints for water vapor transport in the atmosphere and tritium can serve as a powerful tracer in the hydrological cycle. Although general principles of tritium distribution and transfer processes within and between the various hydrological compartments are known, variation on short timescales and aspects...

Two field hydrogeological surveys were conducted in 1992 and 2013 using hydrochemistry and isotope techniques in the far north region of Cameroon which corresponds to the southern part of Lake Chad basin. The dataset relates to shallow groundwaters of the Quaternary and substratum aquifers that were sampled at the same locations to potentially reve...

Wetlands as oxbows play a fundamental socio-economic and environmental role. They behave as efficient tools in regards to hydrological and ecological concerns: they contribute to control rivers discharge (flood prevention and contribution to drought flow) as well as to manage water quality (excess nutrients retention) and they constitute refuge hab...

Coastal aquifers can be considered as an important socio-economic and ecological component worldwide. The implementation of sustainable groundwater management is made difficult by complex hydrological behaviors due to many interactions between groundwater and fresh, brackish and salt surface water. This study proposes an original multi-tracer appro...

Les sources thermo-minérales de la Corse sont très diversifiées : chaudes, acides, gazeuses, ferrugineuses et parfois même sulfureuses. Pietrapola, Puzzichellu ou Orezza, pour ne citer que les plus connues sont toutes d'un intérêt patrimonial majeur et sont pour certaines toujours exploitées. Toutefois, l'origine de ces eaux, leur parcours souterra...

This study was carried out within the framework of the IAEA regional project RAF/7/011 “Integrated and Sustainable Management of Shared Aquifer Systems and Basins of the Sahel region”. The Sahel region is underlain by 5 transboundary aquifer systems including the Senegalo-Mauritanian basin, the Taoudeni basin, the Liptako-Gourma/Upper Volta System,...

In the ongoing scientific effort to improve the knowledge about climate change, paleoclimate proxies can provide crucial insights into past climatic conditions. This is especially important in the Mediterranean which is predicted to be strongly affected by climate change. Stable oxygen isotopes of tree rings can be used as one of those proxies but...

The mountainous island of Corsica in the western Mediterranean basin hosts Mediterranean as well as alpine ecosystems. It is highly affected by current climate change which manifests in an increasing number of heat waves and drought periods. These climate conditions can become crucial for the vitality of pine trees on the island. The interdisciplin...