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Discussion papers
https://doi.org/10.5194/nhess-2019-181
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-181
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 08 Jul 2019

Submitted as: research article | 08 Jul 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Contribution of the Sensitivity Analysis in Groundwater Vulnerability Assessing Using the DRASTIC and Composite DRASTIC Indexes

Mohammad Malakootian and Majid Nozari Mohammad Malakootian and Majid Nozari
  • Department of Environmental Health, School of Public Health, Kerman University of Medical Sciences, Iran

Abstract. The present study estimates Kerman–Baghin aquifer vulnerability by applying the DRASTIC and composite DRASTIC (CDRASTIC) indexes. The factors affecting the transfer of contamination, including the water table depth, soil media, aquifer media, the impact of the vadose zone, topography, hydraulic conductivity, and land use, were ranked, weighted, and integrated using a geographical information system (GIS). A sensitivity test has also been performed to specify the sensitivity of the parameters. The study results show that the topographic layer displays a gentle slope in the aquifer. The majority of the aquifer covered irrigated field crops and grassland with a moderate vegetation cover. In addition, the aquifer vulnerability maps indicate very similar results, recognizing the northwest parts of the aquifer as areas with high and very high vulnerability. The map removal sensibility analysis (MRSA) revealed the impact of the vadose zone (in the DRASTIC index) and hydraulic conductivity (in the CDRASTIC index) as the most effective parameters in the vulnerability evaluation. In both indexes, the single-parameter sensibility analysis (SPSA) showed net recharge as the most effective factor in the vulnerability estimation. From this study, it can be concluded that vulnerability maps can be used as a tool to control human activities for the sustained protection of aquifers.

Mohammad Malakootian and Majid Nozari
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Mohammad Malakootian and Majid Nozari
Mohammad Malakootian and Majid Nozari
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Short summary
The present study estimates aquifer vulnerability by applying the DRASTIC and composite DRASTIC indexes. The factors affecting the transfer of contamination were ranked, weighted, and integrated using a geographical information system (GIS). Agricultural and industrial activities are found to be a major threat in the zones with high and very high vulnerability. This study results could be utilized by private and government agencies as a guide for groundwater contamination assessment.
The present study estimates aquifer vulnerability by applying the DRASTIC and composite DRASTIC ...
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