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Multi-tracer approach to understand nitrate contamination and groundwater-surface water interactions in the Mediterranean coastal area of Guerbes-Senhadja, Algeria

Boumaiza Lamine, Walter Julien, Chesnaux Romain, Huneau Frederic, Garel Emilie, Erostate Mélanie, Johannesson Karen H., Vystavna Yuliya, Bougherira Nabil, Bordeleau Geneviève, Stotler Randy L., Blarasin Mónica, Gutiérrez Mélida, Knöller Kay et Stumpp Christine. (2022). Multi-tracer approach to understand nitrate contamination and groundwater-surface water interactions in the Mediterranean coastal area of Guerbes-Senhadja, Algeria. Journal of Contaminant Hydrology, 251, e104098.

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URL officielle: https://doi.org/10.1016/j.jconhyd.2022.104098

Résumé

Implementing sustainable groundwater resources management in coastal areas is challenging due to the negative impacts of anthropogenic stressors and various interactions between groundwater and surface water. This study focuses on nitrate contamination and transport via groundwater-surface water exchange in a Mediterranean coastal area (Guerbes-Senhadja region, Algeria) that is heavily affected by anthropogenic activities. A multi-tracer approach, integrating hydrogeochemical and isotopic tracers (δ2HH2O, δ18OH2O, 3H, δ15NNO3 and δ18ONO3), is combined with a Bayesian isotope mixing model (MixSIAR) to (i) elucidate the nitrate sources and their apportionments in water systems, and (ii) describe potential interactions between groundwater and surface water. Results from nitrate isotopic composition and the MixSIAR model show that nitrate concentrations mainly originate from sewage and manure sources. Nitrate derived from the sewage is attributed to urban and rural wastewater discharge, whereas nitrate derived from the manure is related to animal manure used to fertilise agricultural areas. High apportionments of nitrate-based atmospheric precipitation are identified in groundwater and surface water; a finding that is specific to this study. The multi-origin stresses combined with evidence of interactions between surface water and groundwater contribute to negatively impacting large parts of the study coastal area. The outcomes of this study are expected to contribute to sustainable management of coastal ecosystems by drawing more attention towards groundwater use and protection. Furthermore, this study may improve scientists' ability to predict the behavior of anthropogenically impacted coastal ecosystems and help decision-makers elsewhere to prepare suitable environmental strategies for other coastal ecosystems currently undergoing an early stage of groundwater resources deterioration.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:01697722
Volume:251
Pages:e104098
Version évaluée par les pairs:Oui
Date:Décembre 2022
Identifiant unique:10.1016/j.jconhyd.2022.104098
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:nitrate, isotope tracers, aquifer, groundwater, surface water, MixSIAR, traceurs isotopiques, aquifère, eaux souterraines, eaux de surface
Déposé le:20 déc. 2022 16:58
Dernière modification:20 déc. 2022 16:58
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