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<p>This study introduces a modified vulnerability assessment approach for inland aquifers susceptible to saline water intrusion, utilizing a revised GALDIT model named GALDITY. The case study focused on the Shahrood aquifer, selected due to its unique hydrogeological and hydrochemical properties. To assess saline water intrusion potential in the Shahrood aquifer, water levels and chemistry parameters were studied through sampling from 115 wells. The modified GALDITY model enhances the GALDIT framework by focusing on the saline-fresh water level difference and including well yield as a parameter, reflecting overexploitation impacts, assessing seven hydrogeological parameters. Each parameter is rated and weighted, producing vulnerability maps that help identify risk zones for effective management. The validation of GALDITY vulnerability map of Shahrood aquifer was performed using TDS concentration as a salinity indicator. The excellent adaptation of points with high TDS and areas with a high vulnerability index, suggests that this model is suitable for investigating the vulnerability of the aquifer to the intrusion of saline groundwater. Comparing the results of the GALDITY model with the original GALDIT model revealed that the improved model exhibited higher accuracy for inland aquifers. According to the vulnerability assessment, approximately 2% of the aquifer is classified as very low vulnerability, 14% as low vulnerability, while 47%, 26%, and 9% of the area fall under moderate, high, and very high vulnerability classes, respectively. The results show the GALDITY model provides valuable insights into the spatial distribution of vulnerability, aiding in the management and protection of internal aquifers against salinization.</p>

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Modification of the GALDIT model (GALDITY) to assess the intrinsic vulnerability to saline water intrusion in inland aquifers

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Zahra Boosalik,
  • Hadi Jafari,
  • Ian Douglas Clark,
  • Farhad Asadian,
  • Mojtaba Noori,
  • Benyamin Rezazadeh balguri

摘要

This study introduces a modified vulnerability assessment approach for inland aquifers susceptible to saline water intrusion, utilizing a revised GALDIT model named GALDITY. The case study focused on the Shahrood aquifer, selected due to its unique hydrogeological and hydrochemical properties. To assess saline water intrusion potential in the Shahrood aquifer, water levels and chemistry parameters were studied through sampling from 115 wells. The modified GALDITY model enhances the GALDIT framework by focusing on the saline-fresh water level difference and including well yield as a parameter, reflecting overexploitation impacts, assessing seven hydrogeological parameters. Each parameter is rated and weighted, producing vulnerability maps that help identify risk zones for effective management. The validation of GALDITY vulnerability map of Shahrood aquifer was performed using TDS concentration as a salinity indicator. The excellent adaptation of points with high TDS and areas with a high vulnerability index, suggests that this model is suitable for investigating the vulnerability of the aquifer to the intrusion of saline groundwater. Comparing the results of the GALDITY model with the original GALDIT model revealed that the improved model exhibited higher accuracy for inland aquifers. According to the vulnerability assessment, approximately 2% of the aquifer is classified as very low vulnerability, 14% as low vulnerability, while 47%, 26%, and 9% of the area fall under moderate, high, and very high vulnerability classes, respectively. The results show the GALDITY model provides valuable insights into the spatial distribution of vulnerability, aiding in the management and protection of internal aquifers against salinization.