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Study and Assessment of Groundwater Vulnerability and Contamination to Nitrate: A Case Study of Mashhad City

Asadi, Parisa | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48305 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ataie-Ashtiani, Behzad
  7. Abstract:
  8. Groundwater resources in arid and semi-arid regions, which the most parts of them have not had enough surface water, is of great importance. Due to the paramount importance of these vital resources, many scholars have conducted various studies on groundwater contamination and, especially, on nitrate as the best indicator of groundwater contamination because of its ability to transport, its low absorption, and its durability in water. In this study, using qualitative methods, groundwater contamination of Mashhad aquifer was evaluated, and then in order to obtain better adjustment with urban areas, these methods were modified which resulted in better correlation with measured nitrat. Based on these methods, the most important reason for contamination of aquifer was contributed to domestic sewer leakage. Furthemore, to evaluate groundwater contamination quantitatively, and to assess the fate of nitogen from cesspits to groundwater table, the Lumped Parameter analytical method modified for urban area was used. The results indicated that most important reason for reduction of nitrate is its transformation into nitrogen through denitrification process. Furthermore, with the increase of depth to groundwater, the nitrate concentration decreases. Generally, using qualitative methods and quantitative model simiultaneously not only increase the accuracy of the methods, but also provide a useful tool for authorities
  9. Keywords:
  10. Vulnerability ; Analytical Method ; Geographic Information System (GIS) ; Groundwater ; Water Pollution ; DRASTIC Method ; Modified DRASTIC

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