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Assessment of groundwater vulnerability and pollution risk using AVI, SPI, and RGPI indexes: applied to southern Gabes aquifer system, Tunisia

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Abstract

Southern Gabes aquifer is part of coastal Jeffara plain located in southeastern Tunisia. It consists a semi-arid area in which groundwater is the main source to water supply for several socio-economic sectors. Southern Gabes aquifer suffers from excessive abstraction and heavy anthropogenic pressures that make local groundwater resources threatened by pollution risks. This study aims to assess groundwater vulnerability, evaluate, and delineate groundwater risk regions. For this, a 17 water samples were carried out in the study area and chemical compositions were analyzed. A well-known AVI model has been used to assess aquifer vulnerability and new algorithms of sensitivity to pollution index (PSI) and risk groundwater to pollution index (RGPI) were implemented and used to assess, classify, and map groundwater pollution risk. Results reveal that study area suffers from high risk. Forty one percent of the total surface of study area has a very high risk. Nonetheless, only 30% of study area has a low to insignificant risk to pollution which necessitates taking severe precautions to protect the southern Gabes aquifer system. The method used in this study seems giving more precise results compared to conventional approaches. Moreover, this method allows assessing the pollution risk with flexible and reliable algorithm even with limited dataset. Hence, the poor natural protective capacity of study area needs a rapid intervention by local authorities in order to develop proactive solutions to protect and preserve groundwater resources from pollution risks and establish a long-term program for groundwater resources sustainable development.

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Data availability

The datasets used and analyzed during the current study are available from the authors on reasonable request.

Code availability

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Authors and Affiliations

  1. Higher Institute of Water Sciences and Techniques, University of Gabes, Gabes, Tunisia

    Mounir Atoui & Belgacem Agoubi

  2. Applied Hydro-Sciences Research Laboratory, Gabes, Tunisia

    Mounir Atoui & Belgacem Agoubi

Authors
  1. Mounir Atoui
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  2. Belgacem Agoubi
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Contributions

The authors significantly contributed in preparing, writing, and revising the manuscript. MA: sampled water, dada collect and analysis, conceptualization, writing the original draft, and formal analysis. BA: resources and writing-review and editing.

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Correspondence to Belgacem Agoubi.

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Responsible Editor: Xianliang Yi

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Atoui, M., Agoubi, B. Assessment of groundwater vulnerability and pollution risk using AVI, SPI, and RGPI indexes: applied to southern Gabes aquifer system, Tunisia. Environ Sci Pollut Res 29, 50881–50894 (2022). https://doi.org/10.1007/s11356-022-19309-5

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