Karstification Potential Mapping in Northeast of Khuzestan Province, Iran, using Fuzzy Logic and Analytical Hierarchy Process (AHP) techniques

Document Type : Research Paper

Authors

Department of Geology, Faculty of Earth Sciences, Shahid Chamran University, Ahvaz, Iran

Abstract

The primary objective of the current study is to produce karstification potentiality maps in northeast of Khuzestan province, Iran, using both fuzzy logic and AHP models as an additional tool in hydrogeological research. Geographic Information Systems (GIS) and Remote Sensing (RS) are used to create two maps depicting the development of the karstification, consisting of five classes, showing the karstification potentiality ranging from very high to very low. The extractions of these maps are based on the study of input data such as: lithology, lineament density, elevation, slope, rainfall, temperature, drainage density and vegetation cover. Eventually, two maps based on weighted spatial modeling system are created. The verification results show that the fuzzy logic model outperformed AHP model for the study area. Based on hydrogeological survey, hydrodynamic characteristics perceived at the outlet of major springs consisting of Dare-Anari (DA), Abshekaloo (AS) and Sarhooni (SH) revealed poorly and well developed karstified systems. The collected data indicated that one of the main factors for karst development in the area is tectonic activity and occurrence of lineaments in various scales.

Keywords


Article Title [Persian]

تهیه نقشه پتانسیل توسعه کارست در شمال شرقی استان خوزستان، ایران با استفاده از تکنیک های منطق فازی و فرآیند تحلیل سلسله مراتبی (AHP)

Authors [Persian]

  • نصرالله کلانتری
  • عباس چرچی
Abstract [Persian]

هدف اصلی از این مطالعه تهیه نقشه های پتانسیل توسعه کارست در شمال شرقی استان خوزستان با استفاده از دو مدل منطق فازی و فرآیند تحلیل سلسله مراتبی (AHP)، به عنوان ابزاری مکمل در تحقیقات هیدرولوژیکی می باشد. سیستم اطلاعات جغرافیایی (GIS) و سنجش از دور (RS) به منظور ایجاد دو نقشه ای که توسعه کارست منطقه را به تصویر می کشند، استفاده شده است. این نقشه ها متشکل از پنج طبقه می باشند که پتانسیل توسعه کارست را از بسیار زیاد تا خیلی کم نشان می دهند. استخراج این نقشه ها بر اساس مطالعه داده های ورودی مانند لیتولوژی، تراکم خطواره، ارتفاع، شیب، بارش، دما، تراکم آبراهه و پوشش گیاهی صورت گرفته است. وزن های اختصاص یافته به تمام این عوامل با توجه به ارتباط آنها با پتانسیل توسعه کارست انجام گرفته است. در نهایت، دو نقشه بر اساس سیستم مدل سازی مکانی وزن دار ایجاد شد. نتایج صحت سنجی نشان داد که مدل منطق فازی نسبت به مدل AHP در مورد منطقه مورد مطالعه عملکرد بهتری دارد. بر اساس بررسی های هیدروژئولوژیکی، خصوصیات هیدرودینامیکی بدست آمده از تحلیل دبی خروجی چشمه های دره اناری، آبشکالو و سرحونی توسعه ضعیف تا خوب کارست منطقه را نشان می دهد. اطلاعات بدست آمده حاکی از آن است که یکی از مهمترین فاکتورهای توسعه کارست منطقه فعالیت های تکتونیکی و تشکیل خطواره ها در مقیاس های مختلف می باشد.

Keywords [Persian]

  • پتانسیل توسعه کارست
  • سیستم اطلاعات جغرافیایی
  • سنجش از دور
  • فرایند تحلیل سلسه مراتبی
  • منطق فازی
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