ارزیابی آسیب‎پذیری ذاتی آلودگی آب زیرزمینی دشت ارومیه با استفاده از مدل‌های دراستیک و دراستیک اصلاح شده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار /گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی.

2 دانش‎آموخته کارشناسی ارشد/ آبیاری و زهکشی، گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی.

3 دانشیار /گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی.

چکیده

ارزیابی پتانسیل آسیب‌پذیری آلودگی آب زیرزمینی برای حفاظت از آب‎های زیرزمینی که متاثر از استفاده زیاد از کود است، ابزار مناسبی می‌باشد. آب زیرزمینی دشت ارومیه به علت وجود کارخانه‌های مختلف و کشاورزی، پتانسیل آلوده شدن را دارد. در این تحقیق از مدل دراستیک اصلاح شده و دراستیک که یک مدل جهانی است آسیب‌پذیری ذاتی آلودگی دشت ارومیه بررسی شد. اصلاح این مدل بر اساس بازبینی رتبه‌ها و وزن‌های فاکتورهای مختلف، با استفاده از روش‌های ساده آماری و در محیط GIS و با درنظر گرفتن مقدار همبستگی با غلظت نیترات آب زیرزمینی انجام شد. نتایج نشان داد که محیط آبخوان (A) همبستگی معنی‌دار با غلظت نیترات ندارد و از معادله اولیه حذف گردید. بیش‌ترین و کم‎ترین همبستگی معنی‌دار را فاکتورهای جنس خاک (s) و عمق تا سطح ایستابی (D) داشتند و به ترتیب وزن‌های 5 و 7/2 به آن‌ها اختصاص یافت. اصلاح رتبه‌ها و وزن‌ها منجر به بهبودی نتایج پهنه‌بندی شد، به گونه‌ای که همبستگی شاخص دراستیک با غلظت نیترات نسبت به دراستیک اولیه، حدود 11 درصد افزایش داشت. بر اساس شاخص دراستیک اصلاح شده از کل دشت ارومیه، 3/4، 8/30 و 9/64 درصد به ترتیب در محدوده‌ی آسیب‎پذیری کم، خیلی کم و بدون خطر آلودگی قرار داشت

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Intrinsic Vulnerability of Urmia Plain Groundwater Pollution Using Original DRASTIC and Drastic Modified Models

نویسندگان [English]

  • J.sh. Azizi Mobaser 1
  • M. Masud Lak 2
  • A. Rasoulzadeh 3
1 Assistant Professor, Department of Water Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
2 M.Sc. Graduate of Irrigation and Drainage, Department of Water Engineering, College of Agriculture and Natural Resources, University of Mohagheghe Ardabili, Ardabil, Iran.
3 Associate Professor. Department of Water Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
چکیده [English]

The Assessment of groundwater vulnerability to pollution for groundwater protects, which is affected by high fertilizer use, is a proper tool. Groundwater of Urmia Plain due to various factories and agricultural activities, have potential for contamination. In this study, the modified version of the DRASTIC model and the original DRASTIC model, which is a global model, has investigated the inherent vulnerability potential of Urmia groundwater contamination. The correction of this model based on the revising of the ratings and weights of various factors was carried out using simple statistical methods and in the GIS environment, taking into account the correlation with the concentration of groundwater nitrate. The results showed that aquifer environment (A) did not significant correlation with nitrate concentration and was eliminated from the initial equation. The highest and lowest significant correlation was found between soil factors (s) and depth to groundwater (D), respectively, and weighed 5 and 2.7, respectively. The correction of ratings and weights led to improved zoning map, with the correlation of the DRASTIC index with nitrate concentration versus the original DRASTIC, increased by 11%. Based on the modified index of the Urmia Plain, 4.3, 30.8 and 64.9 percent were low, very low and without risk of pollution, respectively.

کلیدواژه‌ها [English]

  • Modified DRASTIC
  • Groundwater
  • GIS
  • vulnerability
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