ارزیابی فراسنجه‌های هیدرولیکی آبخوان دشت ملکان با استفاده از مقاومت الکتریکی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دکترای هیدروژئولوژی، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

2 استاد هیدروژئولوژی، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

3 استاد هیدروژئولوژی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

چکیده

شناخت آبخوان و تعیین فراسنجه‌های هیدرولیکی آن برای ارزیابی و مدیریت منابع آب‌های زیرزمینی ضروری است. در این پژوهش به بررسی زمین‌آب‌شناسی و برآورد فراسنجه‌های هیدرولیکی آبخوان دشت ملکان در استان آذربایجان­شرقی با استفاده از داده‌های مقاومت ویژه پرداخته شده است. برای یافتن توزیع مقاومت الکتریکی زیرسطحی واقعی­تر، مقاومت الکتریکی وارون با استفاده از برنامه­های وارون­سازی مقاومت ویژه مدل­سازی شد. مقاومت حقیقی و ضخامت لایه­های زیرسطحی با تعیین ساختار منحنی­های ژرفاپیمایی مقاومت و تعیین منحنی­های الکتریکی منطبق با داده­های صحرایی تعیین شد. ضخامت‌ متوسط آبرفت 75 متر، و مقدار متوسط آب‌دهی ویژه و تخلخل آبخوان به­ترتیب 0/042 و 0/32 برآورد شد. مقاومت عرضی در هر ژرفایابی محاسبه شد و نتایج همبستگی فراسنجه‌های مقاومت عرضی آبخوان، و توان انتقال به‌دست‌آمده از آزمون آب‌کشی، انطباقی پذیرفتنی بین این فراسنجه‌ها نشان داد. مقایسه­ی نتایج روش زمین‌فیزیکی و نتایج آزمون آب‌کشی نشان داد که ارزیابی فراسنجه‌های هیدرولیکی با مقطع‌نگاری پرتوی مقاومت ویژه‌ی الکتریکی پذیرفتنی است، به­طوری­که می‌توان با تلفیق داده‌های به­دست‌آمده از زمین‌فیزیک، آزمون آب‌کشی و پژوهش‌های زمین­شناسی، نتایجی دلخواه را برای ارزیابی و مدیریت بهینه­ی منابع آب زیرزمینی به‌دست آورد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Malekan Plain Aquifer Hydraulic Parameters Using Electrical Resistivity

نویسندگان [English]

  • Farahnaz Azizi 1
  • Asghar Asghari Moghaddam 2
  • Amirhossein Nazemi 3
1 Ph.D. of Hydrogeology, Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
2 Professors of Hydrogeology, Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
3 Professors of Hydrogeology, Department of Irrigation & Drainage, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
چکیده [English]

Estimating aquifer hydraulic parameters is essential for the assessment and management of groundwater resources. In this paper, the hydraulic parameters of Malekan Plain Aquifer were estimated using the resistivity data. The inverse electrical resistivity model to provide the best distribution of subsurface electrical resistance, using the inverse resistivity programs has been carried out. The relative thickness of subsurface layers using the characterization of electrical resistance curves was determined. The average thicknesse of, the alluvial aquifer and its porosity (ϕ) and specific yield (Sy) were estimated at 75 meters, 0.32 and 0.042, respectively. Results indicate a strong correlation between aquifer transmissivity and the transverse presence of resistance. The estimated values from both geoelectrical and pumping test methods indicate that the results of electrical resistivity tomography method are acceptable. Therefore, using suitable results may be obtained a combination of pumping test, geological studies and geophysical methods. The aquifer parameters obtained from the resistivity sounding and pumping test data may be used for an optimal management and assessment of groundwater resources.

کلیدواژه‌ها [English]

  • Electrical resistivity
  • Porosity
  • pumping test
  • specific yield
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