Geochemical tracing and modeling of surface and deep water–rock interactions in elementary granitic watersheds (Strengbach and Ringelbach CZOs, France)

Chabaux, François; Viville, Daniel; Lucas, Yann; Schacherer, Joseph; Ranchoux, Coralie; Pierret, Marie‐Claire; Labasque, Thierry; Aquilina, Luc; Wyns, Robert; Lerouge, Cathérine; Dezayes, Chrystel; Négrel, Philippe

doi:10.1007/s11631-017-0163-5

Cited by 17 publications

(20 citation statements)

References 14 publications

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“…Therefore, aquifer groundwater age increases with depth (Armandine Les Landes et al 2015;Roques et al 2014a), and mineral content increases by water-rock interactions, and with the part of the weathering profile in which the groundwater is flowing (e.g. Chabaux et al 2017;Babaye et al 2019). Consequently, the composite aquifer may show a strong vertical hydrogeochemical stratification, both in the saprolite (Durand et al 2006;de Montety et al 2018) and in the SFL (Alazard et al 2016)-for example, in some watersheds, there is an increase of fluoride concentration with depth (Pauwels et al 2015), and an increase of ages with depth, even in the saprolite (de Montety et al 2018).…”

Section: Hydrogeological Functioning Of Hr Aquifers: Hydrochemistrymentioning

confidence: 99%

Review: Hydrogeology of weathered crystalline/hard-rock aquifers—guidelines for the operational survey and management of their groundwater resources

2021

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Hard rocks 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. The storativity and hydraulic conductivity of hard rocks, and thus their groundwater resources, are controlled by these weathering processes, which created weathering profiles. Hard-rock aquifers then develop mainly within the first 100 m below ground surface, within these weathering profiles. Where partially or noneroded, these weathering profiles comprise: (1) a capacitive but generally low-permeability unconsolidated layer (the saprolite), located immediately above (2) the permeable stratiform fractured layer (SFL). The development of the SFL’s fracture network is the consequence of the stress induced by the swelling of some minerals, notably biotite. To a much lesser extent, further weathering, and thus hydraulic conductivity, also develops deeper below the SFL, at the periphery of or within preexisting geological discontinuities (joints, dykes, veins, lithological contacts, etc.). The demonstration and recognition of this conceptual model have enabled understanding of the functioning of such aquifers. Moreover, this conceptual model has facilitated a comprehensive corpus of applied methodologies in hydrogeology and geology, which are described in this review paper such as water-well siting, mapping hydrogeological potentialities from local to country scale, quantitative management, hydrodynamical modeling, protection of hard-rock groundwater resources (even in thermal and mineral aquifers), computing the drainage discharge of tunnels, quarrying, etc.

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Section: Hydrogeological Functioning Of Hr Aquifers: Hydrochemistrymentioning

confidence: 99%

Review: Hydrogeology of weathered crystalline/hard-rock aquifers—guidelines for the operational survey and management of their groundwater resources

2021

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“…By construction, NIHM can only model shallow water dynamics (section Water cycle monitoring), so that deeper water circulation pathways in the granitic bedrock fractures (as evidenced in deep boreholes, Ranchoux et al, 2021) is not taken into account with this modeling approach, which makes hypothesis (i) plausible. However, the analysis of the geochemical signatures of the spring water and the water collected from observation wells (>50 m deep boreholes and <15 m deep piezometer) showed that the springs water and the piezometers water circulate within the same surface aquifer with a low water residence time, while the water from the deep boreholes circulates in a distinct circulation system, within the fracture network of the granitic bedrock, and is characterized by much higher residence times (Chabaux et al, 2017;Ranchoux et al, 2021). So that when modeling water dynamics inside the Strengbach catchment, neglecting deep water circulation-as it is done by NIHM-is a reasonable hypothesis.…”

Section: Limits Of the Approachmentioning

confidence: 99%

Hybrid Gravimetry to Map Water Storage Dynamics in a Mountain Catchment

et al. 2022

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In mountain areas, both the ecosystem and the local population highly depend on water availability. However, water storage dynamics in mountains is challenging to assess because it is highly variable both in time and space. This calls for innovative observation methods that can tackle such measurement challenge. Among them, gravimetry is particularly well-suited as it is directly sensitive–in the sense it does not require any petrophysical relationship–to temporal changes in water content occurring at surface or underground at an intermediate spatial scale (i.e., in a radius of 100 m). To provide constrains on water storage changes in a small headwater catchment (Strengbach catchment, France), we implemented a hybrid gravity approach combining in-situ precise continuous gravity monitoring using a superconducting gravimeter, with relative time-lapse gravity made with a portable Scintrex CG5 gravimeter over a network of 16 stations. This paper presents the resulting spatio-temporal changes in gravity and discusses them in terms of spatial heterogeneities of water storage. We interpret the spatio-temporal changes in gravity by means of: (i) a topography model which assumes spatially homogeneous water storage changes within the catchment, (ii) the topographic wetness index, and (iii) for the first time to our knowledge in a mountain context, by means of a physically based distributed hydrological model. This study therefore demonstrates the ability of hybrid gravimetry to assess the water storage dynamics in a mountain hydrosystem and shows that it provides observations not presumed by the applied physically based distributed hydrological model.

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“…It was selected in 1986 to study and understand the impact of acid rain on the forested ecosystem (Probst et al, 1990;Pierret et al, 2019). Then, it was progressively and extensively used to understand the main hydrobiogeochemical processes occurring in this type of ecosystem, using a large diversity of geochemical tracing and geochronological approaches (Pierret et al, 2014;Schmitt et al, 2017 andPrunier et al, 2015;Chabaux et al, 2017 and and, more recently, hydrogeochemical modeling (Beaulieu et al, 2016;Weill et al, 2017;Maquin et al, 2017;Belfort et al, 2018;Ackerer et al, 2018;Weill et al, 2019).…”

Section: Site Descriptionmentioning

confidence: 99%

Impact of the hydrological regime and forestry operations on the fluxes of suspended sediment and bedload of a small middle-mountain catchment

Cotel

Viville

Benarioumlil

et al. 2020

Science of The Total Environment

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Geochemical tracing and modeling of surface and deep water–rock interactions in elementary granitic watersheds (Strengbach and Ringelbach CZOs, France)

Cited by 17 publications

References 14 publications

Review: Hydrogeology of weathered crystalline/hard-rock aquifers—guidelines for the operational survey and management of their groundwater resources

Review: Hydrogeology of weathered crystalline/hard-rock aquifers—guidelines for the operational survey and management of their groundwater resources

Hybrid Gravimetry to Map Water Storage Dynamics in a Mountain Catchment

Impact of the hydrological regime and forestry operations on the fluxes of suspended sediment and bedload of a small middle-mountain catchment

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