Quality of groundwater in the Val of Orléans : impact of climate change and sustainable management of groundwater resource
type: Dataset
description: The aim of this study is the impact of climate change on groundwater quality in the Val of Orléans (France). First, geochemical studies made on Loire River and related spring with isotopic composition and major elements revealed a mixing between Loire river water and older karst water in the aquifer. Calcite precipitation and Fe-Hydroxydes formation in the karst play a major role on the behaviour and fate of trace elements. Then, geochemical studies on contaminants like pesticids and pharmaceuticals showed that their occurrence and behaviour vary for each component, according to : the capacity of adsorption on soil/sediment, the degradation rate in waste water treatment plant (for pharmaceuticals) and in natural waters, seasons and climatic conditions, mixing of Loire river water with residual waters in the karst. These chemical investigations allowed us to fix the groundwater quality during our samplings. The threat of local river backflow in the karst system can lead to a degradation of its quality, so the future occurrence of backflow events in the Val was calculated : using a link between backflow events and results of a climatic model downscaling, we found that these events would decrease in frequency in the future. Thus groundwater quality would remain stable, without mixing with contaminated local freshwaters.
identifier: NNT: 2011ORLE2049
issued: 2026-05-22T17:41:26.299023
language: fr
modified: 2026-05-22T17:41:26.299027
contact point: Organization
  fn: CCSD
keyword: geochemical-studies-made-on-loire-river
keyword: infoeu-reposemanticsdoctoralthesis
keyword: qualite-geochimique-de-la-loire
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: theses
landing page: https://theses.hal.science/tel-00659583

Quality of groundwater in the Val of Orléans : impact of climate change and sustainable management of groundwater resource
type: Distribution
format: HTML
issued: 2026-05-22T17:41:26.310371
modified: 2026-05-22T17:41:26.279328
access URL: https://theses.hal.science/tel-00659583

test_moissonnage_selune
type: Agent