تعیین فرونشست شهر مشهد به روش تداخل‌سنجی راداری پراکنشگر دائمی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 گروه فتوگرامتری و سنجش از دور، دانشکده مهندسی نقشه برداری، دانشگاه صنعتی خواجه نصیر الدین طوسی، تهران، ایران

چکیده

یکی از پدیده‌های مخرب زمین‌شناختی، فرونشست زمین است که می‌تواند خسارت‌های مالی جبران‌ناپذیری به دنبال داشته باشد. برداشت بی‌رویه از آب‌های زیرزمینی یکی از عوامل اصلی ایجاد این پدیده است که در حال حاضر در بسیاری از نقاط ایران از جمله مناطق شرق کشور که از خشکسالی رنج می‌برند، در حال وقوع است. دشت مشهد نیز از جمله مناطقی است که بر اساس پژوهش‌های گذشته، نرخ فرونشست بسیار بالایی دارد که در سال‌های اخیر، گستره‌ی آن، بخش‌هایی از شهر را نیز متأثر ساخته ولی تاکنون به علت پیچیدگی فرآیند تعیین فرونشست در شهر، به صورت دقیق اندازه‌گیری و مطالعه نشده است. روش‌های مختلفی برای اندازه‌گیری نرخ فرونشست وجود دارد و در این مقاله، نرخ فرونشست در شهر مشهد با روش تداخل‌سنجی راداری پراکنشگر دائمی، در فاصله زمانی سال 2014 تا 2017 میلادی با استفاده از ترکیب 69 تصویر راداری مدارهای بالاگذر و پایین‌گذر ماهواره‌ی 1A-Sentinel ،مطالعه و تعیین شده است. نتایج تحلیل صورت گرفته در این پژوهش، نرخ فرونشست بسیار بالا در نواحی شمال غرب و شمال شهر مشهد با بیشینه‌ای در حدود 14 سانتی‌متر در سال را نشان می‌دهد. همچنین به‌منظور تفسیر نتایج فرونشست از داده‌های پیزومتری و اطلاعات ژئوتکنیکی استفاده شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Mashhad Subsidence Monitoring by Interferometric Synthetic Aperture Radar Technique

نویسندگان [English]

  • Mohammad Khorrami 1
  • Saeed Abrishami 1
  • Yasser Maghsoudi 2
1 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 Department of Photogrammetry and Remote Sensing, Faculty of Geodesy and Geomatics Engineering, K. N. Toosi University of Technology, Tehran, Iran
چکیده [English]

Deep groundwater withdrawal in Mashhad, one of the largest municipalities in Iran, caused severe land subsidence. Land subsidence in this area can be destructive for urban infrastructures and can create serious environmental issues and structural damages. The main aim of this research is to precisely determine the vertical ground deformations in Mashhad to evaluate and compare the current situation with the previous reports on this area. For this purpose, we have applied Persistent Scatterer Interferometric Synthetic Aperture Radar technique to complement previous works by using more accurate data and procedure in the interested urban area. Furthermore, we considered geotechnical properties which were not focused in the previous studies. For this purpose, 69 descending and ascending C-band radar images, provided by relatively high-resolution Sentinel-1A satellite, were used to estimate the deformation-trend. The method was applied to the images from October, 2014, to February, 2017. The assessment procedure demonstrated a high-rate of subsidence in northwest of Mashhad with the significant deformation of 140 mm/year. The outputs were validated using in-situ measurements data and hydraulic head variations respecting piezometric data extracted from groundwater wells. Subsequently, the geotechnical properties of the chosen area were considered to interpret the results. The results of this study illustrated that the land subsidence in the case study is brutally continuous in most areas and there is no sign of decrease in the amount of deformation rate.

کلیدواژه‌ها [English]

  • Subsidence؛ InSAR؛ PS؛ Permanent Scatterer
  • Groundwater withdrawal
  • Piezometric data

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 51، شماره 6
بهمن و اسفند 1398
صفحه 1187-1204

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