Groundwater potentiality through Analytic Hierarchy Process (AHP) using remote sensing and Geographic Information System (GIS)

Document Type : Research Paper

Authors

1 Semnan University

2 Yazd university

Abstract

Nowadays the use of remote sensing and Geographic Information System (GIS) is one of the most powerful cost effective tools to identify and discover the available groundwater resources. In this paper, Lithological Units, Lineaments, Slope, Topography, Drainage density, Vegetation and Isohyets lines have been achieved by stations and through remote sensing and GIS techniques. All layers of different classes were initialized through hierarchical analysis to potential areas of groundwater and after modeling in GIS Environment, Mahdishahr zone was classified according to the potential groundwater basins. The results show that in the 7 reviewed criteria by the expertise and Analytical Hierarchy Process, geological criterion and lineaments with the relative importance of 0.33 and 0.22, respectively, have greatest importance and priority for potentiality of groundwater in the region. Also in the studied area, Quaternary Alluvium consisted of old and new terrace and river sediments have the highest relative importance and desirability and terrace resources and the elevated old and low height new Foothill Alluvial fans are considered as good potential areas of groundwater. Shemshak Sandstone formations and Barut with a high density lineaments and Tizkouh formation with the thick layers of limestone and Barut are also good areas for groundwater

Keywords


Article Title [Persian]

پتانسیل یابی آبهای زیرزمینی به روش سلسله مراتبی (AHP) با استفا ه از سنجش از دور و سامانه اطلاعات جغرافیایی (GIS)

Authors [Persian]

  • امیر هاتفی اردکانی 1
  • محمد اختصاصی 2
Abstract [Persian]

امروزه استفاده از سنجش از دور و سیستم اطلاعات جغرافیایی (GIS) تبدیل به یکی از ابزارهای قدرتمند و مقرون به صرفه ‌جهت شناسایی و اکتشاف منابع آب زیرزمینی قابل دسترس شده است. در مقاله حاضر واحدهای سنگ‌شناسی، خطواره‌ها، شیب، توپوگرافی، تراکم زهکشی، پوشش گیاهی و خطوط همباران از طریق تکنیک‌های سنجش از دور و GIS تشکیل و پس از وزندهی در کلاس‌های مختلف از طریق تحلیل سلسله مراتبی، حوضه مهدی‌شهر از نظر نواحی بالقوه آبهای زیرزمینی تقسیم‌بندی گردید. نتایج نشان داد که از بین 7 معیار مورد بررسی توسط نظرات خبرگان و روش فرایند تحلیل سلسله مراتبی، معیار زمین شناسی و خطواره به ترتیب با اهمیت نسبی 33/0 و 22/0 دارای بیشترین اهمیت نسبی و ارجحیت بالا جهت پتانسیل‌یابی آبهای زیرزمینی در منطقه می‌باشد. همچنین در منطقه مورد مطالعه آبرفت‌های کواترنری شامل تراس‌های قدیم و جدید و رسوبات رودخانه‌ای دارای بیشترین اهمیت نسبی و مطلوبیت و ذخایر تراسی و مخروط افکنه‌های کوهپایه‌ای قدیمی مرتفع و جدید کم ارتفاع و جلگه‌های آبرفتی به عنوان مناطق بالقوه خوب آبهای زیرزمینی محسوب می‌شوند. تراکم زیاد خطواره‌ها در سازندهای ماسه سنگی شمشک و باروت و همچنین آهک‌های ضخیم لایه سازندهای تیزکوه، لار و زیارت، مناطق خوب و بالقوه آبهای زیرزمینی را تشکیل داده‌اند.

Keywords [Persian]

  • AHP
  • GIS
  • آب زیرزمینی
  • سنجش از دور
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