Agnès Rivière

MINES Paris PSL

Subpermafrost aquifer hydrodynamics is generally poorly known due to monitoring technology issues. The few available data show that this aquifer is confined below continuous permafrost due to ice expansion. We conducted a 2 m × 1 m × 1 m sand box experiment under controlled conditions in a cold room to (1) evaluate the confinement of the unfrozen p...

A new hydrogeophysical approach was developed to reveal the spatial and temporal dynamic flow pathways inside a river corridor as well as the pattern of transient surface water and the groundwater (SW-GW) exchanges. Obtaining such information from traditional hydrological data remains a challenge, both in terms of accuracy and validation. As there...

The quality of the water from a riverbank well field is the result of the mixing ratios between the surface water and the local and regional groundwater. The mixing ratio is controlled by the complex processes involved in the surface water–groundwater interactions. In addition, the drawdown of the groundwater level greatly determines the water head...

In recent years, there has been a growing interest in utilizing the groundwater response to Earth tides as a means to estimate subsurface properties. However, existing analytical models have been insufficient in accurately capturing realistic physical conditions. This study presents a new analytical solution to calculate groundwater response to Ear...

Groundwater (GW)'s strategic importance for water, energy, and food security is growing in the face of ongoing climatic changes and human uses. Precisely quantifying water resources is a critical concern, essential for ensuring sustainable yields and maintaining water quality. Components of the water balance are difficult to obtain, both in terms o...

In recent years, there has been a growing interest in utilizing the groundwater response to Earth tides as a means of estimating subsurface properties. However, existing analytical models have been insufficient in accurately capturing realistic physical conditions. This study presents a new analytical solution to calculate the groundwater response...

An integrated ecohydrological modeling approach was deployed in three long‐term critical zone (CZ) observatories of the French CZ network (CZ Observatories—Application and Research) to better understand how the CZ heterogeneity modulates the water cycle within territories. Ecohydrological simulations with the physically based model EcH2O‐iso constr...

The thermal regime of streams is a relevant driver of their ecological functioning. As this regime is presently submitted to numerous alterations (among others, impoundments, and climate change), it seems important to study both their effects and potential recovery from the latter. Thus, we investigated the surface and hyporheic water temperature a...

While it is well accepted that climate change and growing water needs affect long-term sustainable water resources management, performing accurate simulations of water cycle and energy balance dynamics at regional scale remains a challenging task.Traditional Soil-Vegetation-Atmosphere-Transfer (SVAT) models are used for numerical surface water and...

This article presents field measurements that document the physical and chemical response of riverbeds to critical hydrological and sedimentary forcing in the Selune River (France). The river flows into the bay of Mont Saint-Michel and thus impacts numerous economic activities and the spawning of several key species such as Atlantic salmon and lamp...

The CaWaQS modelling platform, designed and developed at MINES ParisTech Geosciences Center, models the water cycle at the hydrosystem scale by representing the functioning of several compartments of these systems (Flipo et al., 2021). Recent developments have allowed to integrate, in the latest CaWaQS3.X version, a coupling allowing the transient...

Located in the critical zone at the intersection between surface water and groundwater, hyporheic zones (HZ) host a variety of hydrological, biological and biogeochemical processes regulating water availability and quality and sustaining riverine ecosystems. However, difficulty in quantifying water fluxes along this interface has limited our unders...

Given the current climate and anthropogenic evolution, water management becomes one of the greatest challenges of the 21st century. A number of studies have analyzed observed hydrologic trends and their connections with the changing climate. Impacts include changes in runoff, river discharge and groundwater recharge. Water quality is also impacted,...

This project focuses on understanding the hydrogeology of the Critical Zone (CZ). This most heterogeneous and complex region of the Earth ranges from the vegetation top to the aquifer bottom, with a highly variable thickness (e.g.. www.ozcar-ri.org). The strategic importance of the CZ for global water, food and energy security resources are increas...

The Surface Water and Ocean Topography (SWOT) space mission will map surface area and water level changes in lakes at the global scale. Such new data are of great interest to better understand and model lake dynamics as well as to improve water management. In this study, we used the large-scale SWOT simulator developed at the French Space National...

The evolution of water temperature at the stream–aquifer interface and the associated heat fluxes have a major influence on the ecological state. Here, a synthetic case is developed to characterize the behavior of the stream–aquifer interface submitted to meteorological and hydrological forcings as well as to various hydraulic and thermal propertie...

CAWAQS est une plateforme de modélisation du fonctionnement hydrologique et hydrogéologique des hydrosystèmes. Cette plateforme est adaptée aux systèmes de l’échelle du bassin à l’échelle régionale. Elle permet de simuler le cycle de l’eau continental dans son intégralité. Le fonctionnement de chaque compartiment et interface d’un hydrosystème est...

La compréhension de la variabilité spatio-temporelle des processus physiques influençant la température de l'eau et de ses flux de chaleur associés à l'interface nappe-rivière est importante pour mieux appréhender le fonctionnement biogéochimique et écologique. Un cas synthétique est développé pour caractériser le comportement de l'interface nappe...

Rapports de synthèse de la phase VII du PIREN-Seine

L’estimation de l’évolution des échanges nappe-rivière est souvent abordée à l’aide de modèles numériques. Pourtant, la définition des conditions aux limites est généralement fondée sur des hypothèses peu contraintes et limitées à l’emplacement des piézomètres. Nous suggérons ici d’étendre le domaine de modélisation et de construire des contraintes...

La plaine alluviale de la Bassée, située en amont de la confluence entre la Seine et l’Yonne, est un territoire caracterisé par la nécessité de concilier des usages différents mais dont le fonctionnement hydro-biogéochimique reste largement méconnu. Parallèlement aux études de modélisation numérique présentées dans le chapitre 6, un système de suiv...

A water table mapping method that accounts for surface-water–groundwater (SW-GW) connectivity and human pressure, such as pumping and underground structures occurrence, has been elaborated and tested in the heavily urbanized Parisian area. The method developed here consists of two steps. First, hard data (hydraulic head) and soft data (dry wells) a...

Five frequently used water-soluble pesticides (atrazine, diflufenican, metolachlor, pendimethalin, and ethofumesate) were monitored in surface water and groundwater of an agricultural catchment (Canche River) in Northern France for examining the edge-of-field pathways of substances and their characteristic time of transport. The study of surface wa...

The footprint of catchment properties on water flow is reflected into hydrological signals, such as stream discharge. Here we demonstrate that it is possible to constrain catchment properties from the spectral analysis of hydrological signals but only when an appropriate transfer function (TF) is used for interpretation. We show that the appropriat...

A water table mapping method that accounts for surface water-groundwater (SW-GW) connectivity and human pressure, such as pumping and underground structures occurrence, has been elaborated and tested in the heavily urbanized Parisian area. The method developed here consists in two steps. First, hard data (hydraulic head) and soft data (dry wells) a...

The trajectory of the Seine basin water resources is rebuilt from the early 1900s to the 2000s before being projected to the end of the twenty-first century. In the first part, the long-term hydrological data of the Paris gauging stations are analysed beginning in 1885, highlighting the effect of anthropogenic water management on the Seine River di...

The quantification of aquifer contribution to river discharge is of primary importance to evaluate the impact of climatic and anthropogenic stresses on the availability of water resources. Several baseflow estimation methods require river discharge measurements, which can be difficult to obtain at high spatio-temporal resolution for large basins. T...

Core Ideas OZCAR is a network of sites studying the critical zone. OZCAR covers various disciplines. OZCAR will help disciplines to work together for a better representation and modeling of the critical zone. The French critical zone initiative, called OZCAR (Observatoires de la Zone Critique–Application et Recherche or Critical Zone Observatories...

VP/VS or Poisson's ratio estimated from active seismic methods recently proved to be efficient in the imaging of the critical zone and associated hydrosystems. We suggest here a time-lapse application of this approach to provide both spatial and temporal constraints on the hydrodynamic model of the Avenelles experimental basin (Seine et Marne, Fran...

In high-elevation, boreal and arctic regions, hydrological processes and associated water bodies can be strongly influenced by the distribution of permafrost. Recent field and modeling studies indicate that a fully-coupled multidimensional thermo-hydraulic approach is required to accurately model the evolution of these permafrost-impacted landscape...

La compréhension, à l'échelle du bassin versant, du fonctionnement des hydrosystèmes, repose sur une reconnaissance des structures géologiques et de leurs propriétés hydrogéologiques. Ces dernières, souvent extraient d'informations éparses, peuvent être interpolées à l'aide des méthodes classiques de reconnaissance géophysique, de l'échelle pluri-d...

The LOMOS-mini is a new experimental system monitoring transient water and heat fluxes in the hyporheic zone at a sub-daily resolution. Given the coupling of high-frequency hydraulic head gradient and temperature measurements, its innovation when compared to currently available monitoring systems is to operate under transient conditions and to allo...

Understanding the temporal and spatial variations of the surface-subsurface water exchanges is a prerequisite to achieve sustainable water use in basin. The concept of nested stream-aquifer interfaces (Flipo et al., 2014) is used to simulate the variation of the spatio-temporal surface-subsurface exchanges at the watershed scale from LOcal MOnitori...

A coupled sedimentary and hydrogeological model is used to quantify the impact of sedimentary heterogeneities and sinuosity on groundwater fluxes in an alluvial plain deposited by a meandering fluvial system. A 3D heterogeneous alluvial plain model is built with the stochastic/process-based model FLUMY, that simulates the evolution and the sediment...

The impacts of climate change in boreal regions has received considerable attention recently due to the warming trends that have been experienced in recent decades and are expected to intensify in the future. Large portions of these regions, corresponding to permafrost areas, are covered by water bodies (lakes, rivers) that interact with the surrou...

Understanding the state of connection processes of stream–aquifer systems is of great interest for water resources management, particularly in semi-arid regions and where groundwater is extracted in the vicinity of a river bank. Here we present a combined experimental–numerical study to explain physical processes involved in disconnected stream–aqu...

Coupled hydrological-hydrogeological models, emphasising the importance of the stream-aquifer interface, are more and more used in hydrological sciences for pluri-disciplinary studies aiming at investigating environmental issues. Based on an extensive literature review, stream-aquifer interfaces are described at five different scales: local [10 cm-...

The past few decades have seen a rapid development and progress in research on past and current hydrologic impacts of permafrost evolution. In permafrost area, groundwater is subdivided into two zones: supra-permafrost and sub-permafrost which are separated by permafrost. Knowledge of the sub-permafrost aquifers is often lacking due to the difficul...

This work describes the use of different complementing methods (mass balance, polymerase chain reaction assays and compound-specific stable isotope analysis) to demonstrate the existence and effectiveness of biodegradation of chlorinated solvents in an alluvial aquifer. The solvent-contaminated site is an old chemical factory located in an alluvial...

Periglacial areas are usually underlain by permafrost. Its geographic and depth distribution is mainly controlled by surface temperatures and therefore, has fluctuated according to climatic variations, especially during the last glacial/interglacial cycle. Today, permafrost extends predominantly accross the Arctic regions but was also present at mi...

Development and degradation of permafrost di-rectly affect numerous hydrogeological processes such as thermal regime, exchange between river and groundwater, groundwater flows patterns and groundwater recharge (Michel, 1994). Groundwater in permafrost area is subdivided in-to two zones: suprapermafrost and subpermafrost which are separated by perma...

Development and degradation of permafrost directly affect numerous hydrogeological processes such as thermal regime, exchange between river and groundwater, groundwater flows patterns and groundwater recharge (Michel, 1994). Groundwater in permafrost area is subdivided into two zones: suprapermafrost and subpermafrost which are separated by permafr...