نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد، گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

2 دانشجوی دکتری، گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

3 دانشیار، گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

4 استاد، گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران.

چکیده

در این پژوهش، کیفیت آب رودخانه­های بالیقلی­چای و قره­سو، به‌عنوان مهمترین جریان­های آبی استان اردبیل مورد سنجش قرار گرفت. چهار پارامتر اکسیژن محلول (DO)، نیاز اکسیژن زیست­شیمیایی (BOD5)، نیترات (NO3) و فسفات (PO4) در گستره کامل این رودخانه­ها با استفاده از مدل QUAL2Kw مورد ارزیابی قرار گرفت. توان خودپالایی و حداکثر ظرفیت روزانه آلاینده­ها (TMDL) در ارتباط با این پارامترها در دو دوره کم­آبی و پرآبی بررسی شد. نتایج نشان­دهنده اختلاف سطوح شبیه­سازی شده به­وسیله مدل از داده­های اندازه­گیری شده برای هر دو رودخانه بود. بیش­تر مقاطع مورد بررسی از رودخانه­ها توان­ خودپالایی اندکی را نشان دادند. بیش­ترین سطوح خودپالایی (%) به­دست­آمده عبارت بود از: دوره پرآب: 61/226- = DO؛ 30/90 = BOD5؛ 88/99 = NO3؛ 49/96 = PO4؛ دوره کم­آب: 71/281- = DO؛ 13/89 = BOD5؛ 74/94 = NO3؛ و 21/90 = PO4. سطوح محاسباتی TMDL برای سه پارامتر DO، BOD5 و NO3 توان پذیرش بالاتری را در دوره پرآبی نشان دادند. در حالی که برای پارامتر PO4، در هر دو دوره، جریان دارای بار مازاد این ترکیب بود. در مجموع، نتایج به­دست­آمده نشان­گر وضعیت نامطلوب کیفیت آب در بیش­تر بازه­های مورد بررسی از این رودخانه­ها بود

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessing Water Quality Indices and Autopurification Capacity of Balighli-Chai and Ghare-Sou Rivers using QUAL2Kw Model

نویسندگان [English]

  • Gholamreza Rafiee 1
  • Fateh Moezzi 2
  • Hadi Poorbagher 3
  • Kamran Rezaei Tavabe 3
  • Mohammad Ali Nematollahi 4

1 Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Ph.D. Scholar, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

3 Assoc. Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

4 Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

چکیده [English]

The present study was conducted to assess the water quality of the Balighli-Chai and Ghare-Sou Rivers, the main rivers of Ardabil Province, Iran. The levels of dissolved oxygen (DO), biochemical oxygen demand (BOD), nitrate (NO3) and phosphate (PO4) were measured and simulated using the QUAL2Kw model during low- and high-water periods. Also, self-purification capacity and total maximum daily load (TMDL) levels of water quality parameters were calculated. The obtained results indicated considerable differences between the levels simulated by the model from the measured data for both rivers. Most of the river sections had low self-purification capacities. Maximum self-purification capacity (%) were: high water period: DO = -226.61; BOD5 = 90/30; NO3 = 99.88; PO4 = 96.49; low water period: DO = -281.71; BOD5 = 89.13; NO3 = 94.74; PO4 = 90.21. TMDL scores for DO, BOD5 and NO3 were higher during the high-water period, but entire sections of both rivers showed high excess loads of PO4. The results showed that most ranges of both rivers didn't have appropriate water quality conditions. Therefore, it is necessary to make proper decisions to control pollution levels and improve water quality in this basin

کلیدواژه‌ها [English]

  • Ardabil Province
  • Modeling
  • Total Maximum Daily Load
  • Water Quality Monitoring
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