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ارزیابی غلظت نیترات و آسیبپذیری آب زیرزمینی با روشهای GODS و AVI (مطالعۀ موردی: دشت کردکندی‌ـ دوزدوزان، آذربایجان شرقی) | ||
| اکوهیدرولوژی | ||
| مقاله 3، دوره 3، شماره 4، دی 1395، صفحه 517-531 اصل مقاله (1.33 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2016.60355 | ||
| نویسندگان | ||
| شهلا سلطانی1؛ اصغر اصغری مقدم* 2؛ رحیم برزگر3؛ نعیمه کاظمیان4 | ||
| 1دانشجوی کارشناسی ارشد هیدروژئولوژی، دانشکدۀ علوم طبیعی، دانشگاه تبریز | ||
| 2استاد گروه علوم زمین، دانشکدۀ علوم طبیعی، دانشگاه تبریز | ||
| 3دانشجوی دکتری هیدروژئولوژی، دانشکدۀ علوم طبیعی، دانشگاه تبریز | ||
| 4کارشناس آزمایشگاه کنترل کیفی آب استان آذربایجان شرقی | ||
| چکیده | ||
| هدف از این مطالعه، بررسی غلظت نیترات در منابع آب زیرزمینی دشت کردکندی‌ـ دوزدوزان و ارزیابی آسیبپذیری آن با روشهای GODS و AVI است. دشت کردکندی‌ـ دوزدوزان در شمال غرب ایران در استان آذربایجان شرقی واقع شده است که به‌دلیل کمبود منابع آب سطحی مطلوب در این منطقه، آب زیرزمینی اهمیت خاصی برای کشاورزی و آشامیدن دارد. همچنین فعالیتهای شدید کشاورزی و استفادۀ بیش از حد از کودهای کشاورزی سبب شده است که آب زیرزمینی این دشت با خطر آلودگی نیترات مواجه باشد. بنابراین، ضروری است که کیفیت آب زیرزمینی این منطقه نسبت به غلظت نیترات بررسی و میزان آسیبپذیری آن تعیین شود. برای این منظور از 22 حلقه چاه عمیق و نیمه‌عمیق در مهر‌ماه 1394 نمونهبرداری و تجزیۀ هیدروشیمیایی شد. کمترین غلظت نیترات با مقدار 31/3 میلیگرم بر لیتر در شمال دشت و مجاورت ارتفاعات میانی بهدست آمد که علت آن عمق زیاد سطح آب زیرزمینی و دانهریز بودن رسوبات است. بیشترین غلظت نیترات نیز با مقدار 23/37 میلیگرم بر لیتر در جنوب شرقی منطقه متمرکز شده است که میتوان علت آن را به رسوبات دانهدرشت موجود در این ناحیه نسبت داد. براساس نتایج، فعالیتهای انسانی مهمترین دلیل حضور نیترات در آب زیرزمینی منطقه است. این فعالیتها میتوانند از استفادۀ بیش از حد از کودهای کشاورزی توسط کشاورزان یا نشت از سیستمهای فاضلاب خانگی در منطقه ناشی باشد. همبستگی نسبتاً متوسط (497/0 r=) غلظت نیترات با بیکربنات نیز مؤید استفاده از کودهای نیتروژنه در زمینهای کشاورزی است. به‌منظور برآورد اولیۀ آسیبپذیری دشت از روشهای سادۀ AVI و GODS استفاده شد. براساس روش AVI، بخشهای شمال غربی و شرقی دشت و براساس روش GODS بخشهای شمال غربی و جنوب شرقی دشت به‌عنوان مناطق دارای پتانسیل آلودگی بیشتر نسبت به سایر مناطق تعیین شدند. | ||
| کلیدواژه‌ها | ||
| آب زیرزمینی؛ پتانسیل آلودگی؛ دشت کردکندی‌ـ دوزدوزان؛ منشأ نیترات | ||
| عنوان مقاله [English] | ||
| Evaluation of nitrate concentration and vulnerability of the groundwater by GODS and AVI methods (case study: Kordkandi-Duzduzan Plain, East Azarbaijan province) | ||
| نویسندگان [English] | ||
| Shahla Soltani1؛ Asghar Asghari Moghaddam2؛ Rahim Barzegar3؛ Naeimeh Kazemian4 | ||
| 1MSc. student in Hydrogeology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran | ||
| 2Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran | ||
| 3Ph.D. student in Hydrogeology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran | ||
| 4East Azarbaijan Province Water and Waste Water Company, Tabriz, Iran | ||
| چکیده [English] | ||
| The aim of this study is to assess the concentration of nitrate in groundwater resources of the Kordkandi-Duzduzan plain and to evaluate the vulnerability of the groundwater using AVI and GODS methods. Kordkandi-Duzduzan plain is located in East Azarbaijan Province in the northwest of Iran, which groundwater is important for drinking and agriculture in the region due to scarcity of suitable surface waters. As well as, intensive agricultural activities and excessive use of agricultural fertilizers have caused groundwater nitrate contamination. Therefore, it is required to assess the quality of the groundwater regarding nitrate and to determine the vulnerability of the aquifer. For this purpose, 22 water samples were collected from shallow and deep water wells in July 2015 and analyzed. The lowest concentration of nitrate with 3.31 mg/L was from the northof the plain and adjacent of the central ranges which was due to high depth of groundwater level and fine grain of the sediments. The highest nitrate concentration with 37.23 mg/L was from the southeast of the area which can be attributed to the course sediments of this area. The results showed that anthropogenic activities are the main reason for the presence of nitrate in the groundwater. These activities can be caused by overuse of fertilizers by farmers or leakage from domestic sewage systems in the area. The moderate correlation (r = 0.497) between nitrate concentration of bicarbonate also support the use of nitrogen fertilizers in agricultural lands. In order to initial estimation of the vulnerability, simple AVI and GODS methods were used. According to the AVI method, northwest and east of the plain and based on GODS method, northwest and southeast of the plain were determined as the highest contamination potential in comparison with other parts of the plain. | ||
| کلیدواژه‌ها [English] | ||
| groundwater, Contamination potential, Kordkandi-Duzduzan plain, Nitrate source | ||
| مراجع | ||
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