ارزیابی آلودگی نیترات در آب‌های زیرزمینی آبخوان اردبیل با استفاده از سامانه اطلاعات جغرافیایی

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه زمین ‏شناسی زیست‏ محیطی، دانشگاه ارومیه

2 دانشیار گروه زمین ‏شناسی دانشگاه ارومیه

3 استادیار گروه علوم خاک دانشگاه ارومیه

4 شرکت مهندسین مشاور ژرف ‏آذران صدر، ارومیه

چکیده

آب زیرزمینی در بیشتر نقاط جهان مانند ایران از مهم‌ترین منابع تأمین آب برای مصارف گوناگون از جمله شرب است. آلاینده‏های مختلف کیفیت این منابع را به‌شدت تحت تأثیر قرار می‌دهند و استفاده از آن را برای مصارف مختلف ناممکن می‏سازند. نیترات از شناخته‏شده‏ترین آلاینده‏های منابع آب است که در سال‏های اخیر به‌دلیل افزایش جمعیت و توسعۀ کشاورزی در نتیجۀ نیاز بیشتر به مقدار آن در آب‏های زیرزمینی در مناطق مختلف جهان به‌شدت افزایش یافته است. این مطالعه با هدف بررسی مقدار نیترات در آب زیرزمینی آبخوان اردبیل با استفاده از سامانۀ اطلاعات جغرافیایی انجام شده است. بدین‌منظور از 63 حلقه چاه واقع در آبخوان اردبیل در طول دوران خشک سال 1392، نمونه‏برداری و مقدار نیترات آنها تعیین شد. نتایج نشان داد مقدار میانگین نیترات در نمونه‏های چاه‏ها برابر 18/39 میلی‏گرم بر لیتر است. نتایج واریوگرافی نشان داد مقدار نیترات در آب‏های زیرزمینی منطقه ساختار مکانی مستحکمی دارد و روش کریجینگ معمولی با دقت زیادی (508/=R2) قادر به تعیین توزیع مکانی الگوی نیترات در منطقه است. بیشترین آلودگی نیترات در بخش غربی و جنوب غربی منطقه که منطبق با مکان جغرافیایی شهر اردبیل و اراضی کشاورزی حومۀ آن است، مشاهده شد که نشان‌دهندۀ تأثیر فعالیت‏های انسانی بر افزایش نیترات در منابع آب منطقه است.
 
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Nitrate Pollution in Groundwater Resources of Ardabil Aquifer using Geographical Information System

نویسندگان [English]

  • Shahab Moradi 1
  • Hossein Pirkarrati 2
  • Farrokh Asadzadeh 3
  • Ali Aryanfar 4
1 Msc Student, Department of Geology, Urmia University, Urmia, Iran
2 Department of Geology, Urmia University, Urmia, Iran
3 Department of Soil Science, Urmia University, Urmia, Iran
4 Zharf Azaran Sadr Consulting And Engineering Company, Urmia, Iran
چکیده [English]

Groundwater is one of the most important resources of water supply for various uses in many regions all over the globe including Iran. Different contaminants severely affect these resources and might render groundwater unsuitable for consumption. Groundwater contamination by nitrate is a well known globally growing problem due to the population growth and increase of demand for food supplies. This study was conducted to evaluate the nitrate concentration in water resources of Ardabil aquifer using Geographical Information System. Water samples were collected from 63 wells in Ardabil aquifer during the September 2014 and analyzed for nitrate concentration. The average nitrate concentration from the wells was 39.18 mgl-1. Based on the variography analysis, nitrate concentration showed a good spatial structure which may lead to the high performance of the ordinary kriging (R2=0.508) in predicting the groundwater nitrate spatial pattern. Nitrate concentration was very high at the western parts of the aquifer where the Ardabil city and its agricultural lands is located. These results clearly indicates that the anthropogenic sources from human activities and agricultural development are the main reasons of the nitrate pollution in this part of the aquifer.
 
 
 
 
 
 
 

کلیدواژه‌ها [English]

  • water resources
  • drinking water
  • agriculture
  • Kriging
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