Optimization of DRASTIC Model for Vulnerability Assessment of Groundwater Resources Using Analytical Hierarchy Process (Case study: Andimeshk Plain)

Document Type : Research Paper

Authors

1 MSc in Civil and Environmental Engineering, Department of Environmental Engineering, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Iran

2 Assistant Professor, Department of Hydrology and Water Resources, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Iran.

Abstract

     Due to the increasing needs of human societies to groundwater supplies, the resource conservation and pollution prevention is necessary, especially in arid regions. Vulnerability assessment of groundwater can play a vital role in the protection of these resources. The main problem of DRASTIC model as the most widely used models for groundwater vulnerability assessment is the weighting. In this study, the weighting was modified using Analytical Hierarchy Process (AHP). To determine the optimal model, the correlation between the vulnerability index and the groundwater nitrate concentrations were determined using Simple Linear Regression Analysis (SLRA). The results showed that the optimal DRASTIC model has a better correlation rather than normal DRASTIC model. Also, to assess the risk of aquifer pollution, land use parameter added to the parameters and specific vulnerability aquifer map were prepared. The results showed that about 65 and 35 percent of Andimeshk aquifer contamination risk are very low and low, respectively.

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History

  • Receive Date: 15 October 2012
  • Revise Date: 04 October 2014
  • Accept Date: 22 April 2013
  • Publish Date: 23 September 2014

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