ارزیابی توزیع عمقی آلودگی میکروبی در مخازن (مطالعۀ موردی: سد سبلان)

نوع مقاله : پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشکدۀ فنی و مهندسی، دانشگاه بجنورد، بجنورد‌

2 استادیار، گروه مهندسی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران، تهران‌

3 دکترای تخصصی علوم و مهندسی آب، دانشگاه ارومیه، ارومیه‌

چکیده

هدف اصلی پژوهش حاضر، بررسی ارتباط کلیفرم کل (TC) و کلیفرم مدفوعی (FC) با پارامترهای فیزیکی و شیمیایی آب در اعماق مختلف مخزن سد سبلان در شرایط لایه‏بندی حرارتی تابستانه است. به این منظور، نمونه‏برداری از اعماق مختلف سد در ماه‏های خرداد، تیر و مرداد که سد در شرایط لایه‏بندی شدید حرارتی بود، انجام شد. سپس، در هر نمونه پارامترهای pH، TC، FC، هدایت الکتریکی (EC)، فشار (P)، فسفر کل (TP)، کل جامدات محلول (TDS)، اکسیژن محلول (DO) و دمای آب (T) اندازه‏گیری شد. نتایج بررسی‏های اولیه نشان داد با افزایش عمق در ستون آب پارامترهای pH، DO و T کاهش یافته و از طرف دیگر EC، TDS و TP افزایش می‏یابند. نتایج به‌دست‌آمده از روش‏های تحلیل آماری چندمتغیره مانند خوشه‏بندی، همبستگی زوجی و رگرسیون چندمتغیره خطی بیانگر تأثیرپذیری TC و FC از تغییرات P و TDS بود. از طرفی، با حرکت از سطح به سمت کف مخزن سد، پراکنش کلیفرم‏ها کاهش یافت، که افزایش و کاهش کلیفرم به‏صورت نامتوازن است و نمی‏توان الگوی خاصی برای پراکنش آنها در نظر گرفت. با توجه به آنالیز روابط به‌دست‏آمده مشخص شد 58 درصد از تغییرات TC و 59 درصد از تغییرات FC در صورت اطلاع از مقادیر TDS و P، قابل پیش‏بینی هستند. همچنین، نتایج تحقیق حاضر مشخص کرد که FC و TC با T، Do و pH رابطۀ مستقیم دارند و رابطۀ آنها با EC، TDS و P ‌معکوس است.

کلیدواژه‌ها


عنوان مقاله [English]

Vertical Distribution of Microbial Pollution (Case study: Sabalan Dam)

نویسندگان [English]

  • Sadegh Partani 1
  • Roohollah Noori 2
  • Sayyed Hadi Abtahi 3
1 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnurd, Iran
2 Assistant Professor, Graduate Faculty of Environment, College of engineering, University of Tehran, Tehran
3 Ph.D of Water Sciences and Engineering, Urmia University, Urmia
چکیده [English]

The main purpose of the research is to investigate the relationship between pathogenic micro-organisms (total coliforms (TC) and fecal coliforms (FC)) with physical and chemical parameters of water  in different depths of reservoirs. Samples were taken from different depths of the dam reservoir in June, July and August, when the water was in maximum temperature,  pH, TC, FC, electrical conductivity (EC), pressure (P), Total phosphorus (TP), total dissolved solids (TDS), dissolved oxygen (DO) and temperature (T) were measured. Preliminary results showed that pH, DO and T parameters decreased with increasing depth in the water column, while EC, TDS and TP increased. The results obtained from multivariate statistical analysis methods revealed that TC and FC were affected by P and TDS changes. By moving from the surface to the bottom of the dam reservoir, the distribution of the coliforms decreased, which is unbalanced, and no specific pattern of coliform distribution can be considered. Based on the analysis of the relationships, it was found that 58% of total coliform and 59% of fecal coliform changes were predictable if the total soluble and pressurized solids were quantified. Also, by Pearson correlation analysis, it was determined that total coliform and fecal coliform, in none of the four levels, were correlated with total soluble solids and pressure parameters, and none of these parameters had a significant direct effect on them. As a result, fecal coliform and total coliform are directly related to T, Do and pH and inversely related to EC, TDS, and strain.

کلیدواژه‌ها [English]

  • Quality protection
  • Total coliforms
  • Fecal coliforms
  • Biological stratification
  • Dam Reservoir
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