کاربرد شاخص DWQI برای ارزیابی جامع کیفیت آب در آبخوان اردبیل

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه زمین‏ شناسی زیست‏ محیطی، دانشگاه ارومیه

2 استادیار گروه علوم خاک دانشگاه ارومیه

3 دانشیار گروه زمین ‏شناسی دانشگاه ارومیه

چکیده

کیفیت آب از مهم‏ترین پارامترهای مرتبط با توسعه و پایداری فعالیت‏های بشری است. کیفیت آب را می‏توان از مقایسۀ مقادیر پارامترهای کیفی آن با مقادیر استاندارد هر یک تبیین کرد. محدودیت‏های این روش از جمله عدم جامعیت آن موجب توسعۀ شاخص‏های تلفیقی کیفیت آب شده است. هدف از این پژوهش، بررسی جامع شرایط کیفی آب آشامیدنی در آبخوان اردبیل با استفاده از یک شاخص پیشنهادی (DWQIProposed) است و مقادیر کمی و توزیع این شاخص با شاخص‏های متداول کیفیت آب نظیر DWQIG و DWQIA ‌مقایسه شده است. بدین‌منظور نمونه‏برداری از 60 حلقه چاه واقع در آبخوان اردبیل در شهریور‌ماه 1392 انجام گرفت و 21 پارامتر مختلف فیزیکی و شیمیایی در آنها تعیین شد. سپس شاخص  DWQIProposedطی چهار مرحله شامل انتخاب خصوصیات کیفی آب و دسته‏بندی آنها، توسعۀ زیرشاخص، تخصیص ضریب وزنی برای خصوصیات برگزیده و ارائۀ تابع تجمیع محاسبه شد. نتایج نشان داد به‌رغم تفاوت در مقادیر کمّی، الگوی توزیع فراوانی شاخص‏های DWQIG و DWQIProposed مشابه هم است. شاخص‏های DWQIProposed و DWQIA نیز در مقادیر زیاد تشابه فراوانی داشتند. با این‌حال، تفاوت بین میانگین شاخص‏های در منطقه معنا‏دار بود (05/0P<). سه شاخص یاد‌شده براساس ضریب همبستگی پیرسون ارتباط معنا‏داری داشتند (001/0P<؛ 99/0-98/0 = r). از بین پارامترهای کیفی مرتبط با بهداشت و سلامت، مقدار نیترات همبستگی بسیار زیادی با شاخص‏های یاد‌شده نشان داد (001/0P<؛ 815/0-712/0 = r) که بیان‌کنندۀ تأثیر مهم نیترات بر کیفیت آب در آبخوان اردبیل است. الگوی مکانی شاخص‏های کیفیت آب استحکام فضایی مطلوبی نشان داده و نقشه‏های کریجینگ ترسیم‌شده بیان‌کنندۀ افزایش کیفیت آب در مناطق شرقی و کاهش آن در بخش جنوب‏غربی منطقه است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Application of DWQI for comprehensive evaluation of drinking water quality

نویسندگان [English]

  • Zahra Sheykhi Alman-Abad 1
  • Farrokh Asadzadeh 2
  • Hossein Pirkharrati 3
1 MSc Student, Department of Geology, Urmia University, Urmia, Iran
2 Assistant Professor, Department of Soil Science, Urmia University, Urmia, Iran
3 Associate Professor, Department of Geology, Urmia University, Urmia, Iran
چکیده [English]

Water quality is considered as one of the most important factors in development of the civilizations and sustainability of human activities. Water quality can be evaluated by comparing each of the chemical properties in water samples with their reference values. The single parameter comparison method is characterized by some limitations and a comprehensive evaluation of  water quality is not possible using this method. Thus, water quality indices have been developed during the last 3 decades. The aim of this study was to comprehensively evaluate the water quality in Ardabil aquifer with a newly proposed drinking water quality index (DWQIProposed). The DWQIProposed  was also compared with the conventional water quality indices including DWQIA and DWQIG. Water samples were collected from 60 wells in Ardabil aquifer during the September 2014 and analyzed for 21 different physical, chemical, and biological properties. DWQIProposed were computed in four steps including parameter selection, parameter categorization, development of sub-index with regression statistics, and aggregation of the sub indices. Based on the obtained results, although there was a quantitative difference between the DWQIProposed and DWQIG, their probability distribution functions reflect a similar pattern. DWQIProposed and DWQIA have similar values for samples with excellent water quality. ANOVA results indicated that the mean difference between three indices is significant (P<0.05) but there was a high correlation between these three indices (r=0.98-0.99, P<0.001). Among the health related properties, Nitrate has the highest correlation coefficient with water quality indices (r=0.712-0.815, P<0.001) which emphasizes the effect of nitrate on water quality at the region. Water quality indices are considered to have strong spatial dependence and their kriging maps clearly showed the declining trend in water quality when moved from north-eastern parts of the region to the south-western parts.

کلیدواژه‌ها [English]

  • Comprehensive water quality indices
  • water quality groups
  • Nitrate
  • Kriging
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