test_moissonnage_selune
type: Agent

oai-hal-tel-00778427v2
type: Dataset
contact point: Organization
  fn: CCSD
keyword: infoeu-reposemanticsdoctoralthesis
keyword: numerical-model
keyword: aquifere-fracture
keyword: residence-time
keyword: signal-dentree
keyword: pays-basque
keyword: stable-isotopes
keyword: modele-numerique
keyword: profil-dalteration
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: input-signal
keyword: ions-majeurs
keyword: temps-de-sejour
keyword: isotopes-stables
keyword: weathered-profile
keyword: basque-country
keyword: major-ions
keyword: hard-rock-aquifer
keyword: theses
landing page: https://theses.hal.science/tel-00778427
description: Hard-rock aquifers are one of the major challenges for the current hydrogeology. These fractured formations are intensively exploited for drinking water supply becoming an essential resource for many people. The metamorphic massif of Ursuya (France, 64) is one of this strategic aquifer. A multidisciplinary approach has led to understand the functioning of this system. The results help to progress in the knowledge of discontinuous media and they provide supports for a rational management of this resource.The input signal is characterized by both quantitative and qualitative methods. Monitoring of climate parameters is used to estimate the amount of aquifer recharge. Isotopic characterization of rainwater highlights the principal Atlantic origin of air masses which are responsible of precipitation on the north-western Basque Country. Some rainfall events are also due to atmospheric circulation over the Iberian Peninsula, the Northern Europe and the Mediterranean region. The chemical composition of rainwater, resulting from these origins, is characterized by a low acidity and sometimes by high concentrations of anthropogenic elements.The hydrochemistry of groundwater is studied in conjunction with residence time data. These are acquired by the interpretation of 3H, CFCs and SF6 concentrations. The chemical characteristics, the measured residence times (less than 10 years to over than 50 years) and the associated mixing processes allow the achievement of a conceptual model of groundwater flow. It points out the role of the weathering profile (from the surface to the depth : weathered layer, fractured rock and fresh bedrock) from the point of view of the mineralization as well as the flowpaths.A quantitative approach is finally proposed. Boreholes studies show highly heterogeneous hydrodynamic properties (10-4 m s-1 < K <10-8 m s-1). Weathered materials provide a storage capacity and a smoothing of the recharge variations, these results are synthesized and validated by a…
identifier: NNT: 2012BOR30074
issued: 2026-05-09T16:15:05.264457
language: fr
modified: 2026-05-09T16:15:05.264461
title: Characterization of groundwater flow in fractured aquifers by coupled hydrology-geochemical-hydrodynamics approaches. Application on the Ursuya massif(Basque Country, France) : application on the Ursuya massif (Basque Country, France)

https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00778427v2/resource/7a6e9139-8fc2-411c-b808-954e652a2c9b
type: Distribution
access URL: https://theses.hal.science/tel-00778427
format: HTML
issued: 2026-05-09T16:15:05.267325
modified: 2026-05-09T16:15:05.239957
title: Characterization of groundwater flow in fractured aquifers by coupled hydrology-geochemical-hydrodynamics approaches. Application on the Ursuya massif(Basque Country, France) : application on the Ursuya massif (Basque Country, France)