نشریه محیط زیست طبیعی

ارزیابی کیفیت آب دریاچه سد گاران مریوان با استفاده از شاخص کیفی NSFWQI

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیلات، دانشکده منابع طبیعی دانشگاه کردستان .

2 گروه شیلات، دانشکده منابع طبیعی دانشگاه کردستان

3 گروه شیلات، دانشکده منابع طبیعی دانشگاه کردستان.

چکیده

پایش کیفی مستمر منابع آب از ابزارهای اصلی مدیریت و حفاظت از این منابع با ارزش به حساب می‎آید. استان کردستان از نظر آب‌های سطحی و زیرزمینی یکی از استان‌های مهم کشور محسوب می‌گردد و سد گاران مریوان می‎تواند نقش مهمی را در تأمین آب شرب، فعالیت‎های کشاورزی و صنعتی داشته باشد. بدین منظور برای تعیین کیفیت آب با استفاده از شاخص NSFWQI، 9 عامل فیزیکی، شیمیایی و میکروبی آب دریاچه سد گاران از مردادماه 1396 تا تیرماه 1397 در 4 ایستگاه بررسی شد. نتایج نشان داد که میانگین دمای آب دریاچه 7/6±13/11 درجه سانتی‎گراد و غلظت اکسیژن محلول لایه سطحی و عمقی به‎ترتیب 44/8 و 87/3 میلی‎گرم بر لیتر بود. میانگین سالانه نیترات، فسفات، BOD5، TS و pH به ترتیب برابر با 49/0±66/0، 03/0±052/0، 5/2±32/1، 57/56±91/156 میلی‌گرم بر لیتر و 33/0±99/7 بود. میانگین کلی‎فرم مدفوعی نیز MPN 69/8±15/20 به‌دست آمد که کم‎ترین میانگین آن در مهرماه (MPN 25/0) و بیشترین آن در اسفندماه (MPN 208) مشاهده گردید. همچنین کیفیت آب دریاچه براساس میزان شاخص NSFWQI (71/70) دارای درجه خوب بود. به‎طورکلی، اگرچه تغییرات زمانی و مکانی در بعضی عوامل اندازه‎گیری شده مشاهده گردید اما طبق نتایج به‎دست آمده از خصوصیات فیزیکی و شیمیایی و شاخص NSFWQI، کیفیت آب سد گاران طی ماه‎های مختلف در طبقه متوسط تا خوب قرار داشت بنابراین برای فعالیت‎های کشاورزی، صنعتی و حتی آب شرب بعد از تصفیه متدوال مطلوب ارزیابی گردید.

کلیدواژه‌ها

عنوان مقاله [English]

Water Quality Assessment of the Garan dam reservoir (Marivan) using NSFWQI qualitative index

نویسندگان [English]

  • Erfan Karimian 1
  • Barzan Bahrami Kamangar 2
  • Habibollah Mohammadi 2
  • Edris Ghaderi 3

1 Fisheries department, Faculty of Natural Resources of Kurdistan University .

2 Fisheries department, Faculty of Natural Resources of Kurdistan University

3 Fisheries department, Faculty of Natural Resources of Kurdistan University

چکیده [English]

Continuous quality monitoring of water resources are important tools to manage and protect these valuable resources. Kurdistan province is one of the most important provinces in Iran in terms of surface and underground waters, and the Garan reservoir (Marivan) has important rules in drinking water supply, agricultural and industrial activities. For this purpose, 9 water physicochemical and microbial characteristics were studied to determine water quality using NSFWQI index at four sites of Garan reservoir from July 2017 to August 2018. Results showed that the average temperature of water was 11.13 ± 6.7 °C and the Dissolved Oxygen (DO) concentration was 8.44 and 3.87 mg/l for surface and deep layers respectively. Also the annual mean value of Nitrate, Phosphate, Biochemical Oxygen Demand (BOD5), Total Solids (TS) and pH were 0.66, 0.052, 1.32, 156.91 mg/l and 7.99 respectively. The mean of fecal coliform was 20.15 MPN so that the minimum of value was seen in October (0.25 MPN) and maximum of value was observed in March (208 MPN). As well as Lake Water had good quality according to NSFWQI index value (70.72). In general, although temporal and spatial variations were observed in some of the measured parameters, but based on the results of the physico-chemical characteristics and NSFWQI index, the Garan reservoir is categorized in having middle to good levels therefore, it was evaluated as desirable for agricultural, industrial activities and even drinking water after regular treatment.

کلیدواژه‌ها [English]

  • Physico-chemical characteristics
  • NSFWQI index
  • Garan reservoir
  • Marivan
  • Kurdistan
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نشریه محیط زیست طبیعی
دوره 73، شماره 3
آذر 1399
صفحه 571-583