Contribution of a coupled geochemical and physical approach for the characterization of transient groundwater flow applied to the Forez Plain (France, Loire 42).
type: Distribution
access URL: https://theses.hal.science/tel-00783984
format: HTML
issued: 2026-05-14T18:02:51.534464
modified: 2026-05-14T18:02:51.448723

Contribution of a coupled geochemical and physical approach for the characterization of transient groundwater flow applied to the Forez Plain (France, Loire 42).
type: Dataset
contact point: Organization
  fn: CCSD
keyword: formations-alluviales-de-la-plaine-du-forez
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: regime-transitoire
keyword: 42
keyword: geochemistry
keyword: plaine-du-forez-france
keyword: transient-flow
keyword: fonctionnement-hydrogeologique
keyword: geochimie
keyword: theses
keyword: hydrogeological-analysis
keyword: alluvial-aquifers
keyword: hydrodynamique-souterraine
keyword: infoeu-reposemanticsdoctoralthesis
keyword: groundwater-flow
landing page: https://theses.hal.science/tel-00783984
description: The Water Management Scheme in the Forez plain (France 42) has concluded to a degradation of the water resources and a serious pollution of the shallow aquifers by nitrogen and pesticides. These issues require a sustainable and balanced management of the water resources. A part of the water demand is met by groundwater. The exploited groundwater come from: shallow alluvial formations exploited for irrigation and drinking water and deep aquifers in sedimentary basin under the alluvium. Mineral waters from the deep aquifers are exploited for thermo-mineral activities and bottling.The analysis of the data available in the studied area revealed a lack of knowledge in the understanding of the groundwater flow in the shallow aquifers. Is not sufficient to explain how the water resource varies with time and the origin of the recharge of the shallow aquifers. As consequence, this thesis work will focus on these two main topics: - Identification of the transient functioning of the aquifers based on a physical characterization of groundwater flow. This method is based on piezometric head analysis carry out on 4 stations with continuous measurements and numerical modeling to compare with the observed piezometric fluctuations.- Identification of the origin of the recharge of the alluvial aquifers through a geochemical characterization of groundwater flow (major ions and isotopes δ180, δ2H, δ13C and A14C). This approach established the partial contribution of the deep aquifers to the groundwater flow in the shallow alluvium. This methodology based on a coupled geochemical and physical approach allows to assess the vulnerability of the studied aquifers and contributes to improve the future water resources management in this area.
identifier: NNT: 2012EMSE0666
issued: 2026-05-14T18:02:51.481039
language: fr
modified: 2026-05-14T18:02:51.481044

test_moissonnage_selune
type: Agent