ارزیابی کیفیت آب رودخانه کارون بر پایه شاخص‌های IRWQI و WAWQI در دو ایستگاه ملاثانی و اهواز

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

چکیده

آلودگی رودخانه‌ها با انواع فاضلاب‌های شهری، صنعتی و پساب‌های کشاورزی تهدیدی جدی برای سلامت انسان و اکوسیستم‌های آبی به شمار می‌رود؛ بنابراین ارزیابی کیفیت آب‌های سطحی یکی از شاخص‌های اصلی مدیریت پایدار منابع است. تحقیق حاضر به‌منظور بررسی کیفیت آب رودخانه کارون (در ایستگاه‌های ملاثانی و اهواز) در طول سال 1397 با استفاده از دو شاخص IRWQI و WAWQI صورت گرفت. همچنین انواع پارامترهای فیزیکی، شیمیایی و بیولوژیکی آب مورد بررسی‌های آماری قرار گرفتند. بررسی مقدار هر دو شاخص نشان می‌دهد که وضعیت رودخانه به سمت پایین‌دست به دلیل ورود فاضلاب‌های صنعتی به‌ویژه واحدهای کشت و صنعت، کارخانه‌های نیشکر و نیروگاه‌های حرارتی حاشیه رودخانه افت می‌کند. نتایج تحقیق بیانگر آن هستند که کیفیت آب رودخانه بر اساس شاخص WAWQI در ایستگاه ملاثانی و اهواز به ترتیب در رده کیفی ضعیف و خیلی ضعیف و بر اساس شاخص IRWQI در رده کیفی به نسبت بد قرار می‌گیرد. میزان شاخص WAWQI در بدترین و بهترین وضعیت مربوط به ماه اردیبهشت ایستگاه اهواز (89/85) و ماه تیر ایستگاه ملاثانی (04/49) می‌باشد. همچنین میزان شاخص IRWQI در پایین‌ترین و بالاترین سطح کیفی مربوط به ماه آذر ایستگاه اهواز (75/32) و ماه تیر ایستگاه ملاثانی (51/42) می‌باشد؛ بنابراین با استناد به نتایج به‌دست‌آمده از شاخص‌های کیفی می‌توان گفت شاخص WAWQI در رده‌بندی کیفی آب کمی محافظه‌کارانه‌تر از شاخص IRWQI عمل می‌کند. همچنین به دلیل مقادیر بالای پارامترهای کلیفرم مدفوعی، TDS و کدورت در هر دو ایستگاه، آب رودخانه برای هیچ‌یک از کاربری‌های شرب، کشاورزی و حفظ اکوسیستم آبی مناسب نمی‌باشند. تجزیه‌وتحلیل‌های آماری نشان می‌دهد مجموع آنیون‌ها و کاتیون‌ها با 46/0 درصد و کلیفرم مدفوعی با 14/24 درصد به ترتیب کمترین و بیشترین سهم در میزان WAWQI دارند. این پژوهش مبین آن است TDS آب رودخانه همبستگی قوی با Na و Cl نشان می‌دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Karun River Water Quality Based on IRWQI and WAWQI Indicators in Molasani and Ahvaz Stations

نویسندگان [English]

  • Kameleh Aghajanloo
  • Ehsan Hajizadeh
  • Sahar Ariaeezadeh
civil Engineering Department, Engineering Faculty, University of Maragheh, Maragheh, Iran
چکیده [English]

Rriver pollution due to various urban and industrial wastewater and agricultural effluents is a serious threat to human health and aquatic ecosystems. Therefore, surface water quality assessment is one of the main indicators of sustainable resource management. The present study was conducted to evaluate the water quality of Karun River (in Molasani and Ahvaz Stations) during 1397 using two indicators, IRWQI and WAWQI. Also, various physical, chemical and biological parameters of water were statistically analyzed. An examination of both indicators' value shows that the river situation in downstream is declining due to the entry of industrial wastewater, especially agro-industrial units, sugarcane factories and thermal power plants along the river. The results show that the river water quality according to WAWQI index in Malasani and Ahvaz stations is in poor and very poor category and according to IRWQI index is relatively poor. The WAWQI index related to Ahvaz station in May (85.89) and Mollasani in July (49.04) is in the worst and best condition. Also, IRWQI index in the lowest and highest quality level is related to Ahvaz station in December (32.75) and Malasani station in July (42.51). Therefore, based on the results obtained from quality indicators, it can be concluded that the WAWQI index is slightly more conservative in classifying water quality than the IRWQI index. Also, due to the high values ​​of fecal coliform parameters, TDS and turbidity in both stations, water is not suitable for any of the drinking, agricultural and aquatic ecosystem uses. The statistical analysis the sum of anions and cations with 0.46% and fecal coliform with 24.14% have the lowest and highest portion in WAWQI, respectively. This study shows that TDS in river shows a strong correlation with sodium and chlorine.

کلیدواژه‌ها [English]

  • river
  • IRWQI Index
  • WAWQI index
  • Correlation analysis
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