Investigation of Saline Water Intrusion in the Borazjan Freshwater Aquifer from the Dalaki and Helleh Rivers

Document Type : Research Paper

Authors

• J. Mozafarizadeh
• Z. Sajadi

Abstract

Freshwater scarcity in the Borazjan Plain is approaching a crisis state.  Helleh and Dalaki, as two of the most important surface water resources, are claimed to be the main source of salt pollution of the local Borazjan aquifer.  To validate this claim, and to develop strategies to mitigate this disturbing process, water samples were obtained from 22 representative production wells scattered on the plain, and from the Helleh River. Results of the chemical analyses of these samples were correlated with their positions relative to the geological formations and other potential sources of contamination. Results indicated that both the Dalaki and Helleh Rivers   were instrumental in the water quality deterioration. Furthermore, dissolution of halite and gypsum from the geological formations that abound in the area contribute NaCl and CaSO₄ as the main contaminants of the aquifer; the discarded brine from the oil wells and the irrigation return flow contribute to water pollution as well. The distinct linear trend between Na and Cl concentrations in the ionic ratio diagram indicated the mixing of fresh and saline water, and an occurrence of surface water intrusion, especially in the central and northwest of the plain. However, recharge from limestone formations in the eastern part of the plain improves the water quality in that area. Over-pumping tends to increase the thickness of the fresh-saline water mixing zone, thus increasing the   salinity of production wells' salinity. Prudent management of groundwater is a practical policy in sustaining the use of this limited precious resource in the Borazjan Plain.

Keywords

• Borazjan plain
• Dalaki and Helle rivers
• saline water intrusion
• Salinity

20.1001.1.20086377.1392.6.16.7.3

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References

1. 1 .حاجیان، م.، ا. ر. رهسپار، م. وحید دستجردی، و ا. حسن

   زاده. 1388 .بررسی برخـی فراسـنجهای تعیـین کننـده

   کیفیـت آب رود زاینـده رود، دوازدهمـین همـایش ملـی

   بهداشـت محـیط ایـران، دانشـگاه علـوم پزشـکی شـهید

   بهشتی

   2. Custoddio, E. 1987. Hydrogeo chemistry

   and tracer, in Custoddio, E., Groundwater

   problems in coastal areas: Studies and

   reports in hydrology No. 45, UNESCO,

   p.213- 269.

   3. Darmawan, A., and M.Oguchi Yokohari.
   4. Land use/ cover and surface water

   quality at multiple spatial scales in the

   Kanto Region. Graduate School of

   Frontier Science. The Univesity of Tokyo.

   4. Ghassemi, F., A.J. Jakeman, and H.A.

   Nix. 1995. Salinisation Of land and water

   resource. Australia. p.28-35 and 345-348.

   5. Gibbison, A., and J. Randall. 2006. The

   salt water intrusion problem and water

   conservation practices in southeast

   Georgia, USA. Water and Enviro. J.2.

   6. Glynn, P.D., and L.N. Plummer. 2005.

   Geochemistry and the understanding of

   groundwater system. Hydrogeol. J. 13:263

   – 287.

   7. Karanth, K.R. 2001. Ground water

   assessment development and

   management. Tata McGraw-Hill.

   8. Mahadev, J., S. P. Hosamani Akheel, and
   9. Ahmed. 2010. Statistical multivariate

   analysis of lake water quality parameters

   in Mysore, Karnataka, India. World Appl.

   Sci. J. 8: 1370-1380.

   9. Method in Orissa. India. World Applied

   Sciences Journal 9 (12): 1392-1397.

   10. Ravikumar, P., and R.K. Somashekar.
   11. Multivariate analysis to evaluate

   geochemistry of ground water in Varahi

   River basin of Udupi in Karnataka (India).

   Nat. Environm. Assoc. The Ecoscan 4

   (2&3): 153-162.

   11. Reza, R., and G. Singh. 2010. Assessment

   of ground water quality status by using

   water quality index.

   12. Richter, B.C., and C.W. Kreitler. 1993.

   Geochemical techniques for identifiying

   sources of Ground-Water

   Salinization,C.K.Smoley,258p.

   13. Sarin, M.M., S. Krishnaswamy, K. Dilli,

   B.L.K. Somayajulu, and W.S. Moore

   .1989. Major-ion chemistry of the Ganga–

   Brahmaputra River system: weathering

   processes and fluxes to the Bay of Bengal.

   Geochem Cosmochim Acta53:997–1009.

   14. Sikdar, P.K., S.S. Sarkar, and S.

   Palchoudhury. 2001. Geochemical

   evolution groundwater in the Quaternary

   aquifer of Calcutta and Howrah, India. J.

   Asian Earth Sci. 19: 579-594.

   15. Spears, D.A. 1986. Mineralogical control

   of the chemical evolution of groundwater.

   In: Trudgill ST (ed) Solute processes.

   16. William, W.D. 2001. Anthropogenic

   salinization of inland waters.

   Hydrobiology, 329-337p.