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University of Mohaghegh Ardabili (2017)

Groundwater Pollution Vulnerability Assessment Using Overlap Methods in Urmia plain

Masoudlak, Mahsa

Titre : Groundwater Pollution Vulnerability Assessment Using Overlap Methods in Urmia plain

ارزیابی آسیب¬پذیری آلودگی آب زیرزمینی دشت ارومیه با استفاده از روش¬های همپوشانی

Auteur : Masoudlak, Mahsa

Université de soutenance : University of Mohaghegh Ardabili

Grade : Master 2017

Résumé
Ground waters are the best and in some cases are the only option to obviate the need for drinkable water and agricultural needs and semi-arid countries. Underground waters are prone to pollution from several aspects. The best way to avoid pollution is recognizing sources of contamination, vulnerable regions, obtaining configuration maps, and adopting suitable management plans. In this regard, this study investigates the vulnerability of underground waters in Urmia plain. Urmia plain is located at the west of Iran and is attached to the Urmia Lake from the east. The high possibility of contamination in this region is attributed to numerous agricultural and industrial activities. In this research, SI, DRASTIC and SINTACS models have been used. In total, the DRASTIC model is obtained using the following parameters : depth of the underground water, net water withdrawal, aquifer conditions, and type of soil, topography, unsaturated atmosphere and hydraulic conductivity. Similarly, the SINTACTS model involves the same 7 parameters. Unlike the former two models the SI model involves 5 parameters as follows : depth of the underground water, net water withdrawal, materials forming the aquifer, usage of the land and topography. Finally, a configuration map for vulnerability is obtained which requires an assessment with the configuration map of nitrates. SINTACTS model shows that 17.5% of the Urmia plain is within extreme vulnerability range, 39.943 within very high vulnerability and 42.240% within high vulnerability. SI model gives the following results : 9.619% of the Urmia plain is within very high vulnerability range, 41.107% within average high vulnerability, 20.805% within low average vulnerability, 25.782% within low vulnerability and 2.684% within very low vulnerability range. Based on the DRASTIC model, 11.957% of the plain is within low vulnerability range, 61.477 within low vulnerability range and 26.565% face no vulnerability/pollution. Statistical comparisons of results with that of nitrates’ show that the statistical index R2 for SINATICS equals to 70.3% which is the most favorable criterion for damage evaluation. First and foremost, management plans should be adopted for underground water around the Urmia Lake which suffers from high vulnerability. Keywords : Potential mapping, Groundwater, DRASTIC, SI, SINTACS

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