پایش نفوذ آب در خاک با استفاده از روش ژئورادار و مقاومت ویژه الکتریکی (مطالعه موردی: مکان آزمایش ژئوفیزیکی دانشگاه صنعتی شاهرود)

نوع مقاله : مقاله پژوهشی‌

نویسندگان

1 کارشناس ارشد، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 دانشیار دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

چکیده

در این تحقیق با برداشت داده‌های ژئورادار و مقاومت ویژه الکتریکی از مخزن پلی‌اتیلنی در حالت خالی و پر از محلول کات کبود، روش‌های مقاومت ویژه الکتریکی و رادار نفوذی به زمین (GPR) به‌صورت کنترل‌شده در مکان آزمایش‌های ژئوفیزیک دانشگاه صنعتی شاهرود مطالعه شده است. جهت بررسی چگونگی تغییرات ویژگی‌های الکتریکی بر اثر فرورفت جریان محلول در یک زمین آبرفتی و همچنین تغییرات ناشی از پر یا خالی بودن یک لوله پلی‌اتیلنی مدفون، با استفاده از دو روش ذکر شده، برداشت داده در زمین آبرفتی، قبل و بعد از نشت محلول به سطح زمین انجام شده است. لوله پلی‌اتیلنی مخزنی است که با یک شیر در سطح زمین آبرفتی تخلیه می‌شود. داده‌های مقاومت ویژه الکتریکی و GPR محدوده در دو زمان متفاوت (تابستان و پاییز)، برداشت، پردازش و تفسیر شده است. پردازش، مدل‌سازی و تفسیر داده‌های برداشت شده در قالب مدل‌های دوبعدی مقاومت ویژه الکتریکی و مقاطع عرضی GPR انجام شده است. از مهم‌ترین نتایج این مطالعه می‌توان به عملکرد خوب روش مقاومت ویژه الکتریکی در آشکارسازی جزئیات، آشکار نشدن مناسب جزئیات در روش GPR برای زمین‌های آبرفتی با رس زیاد، نامناسب بودن آنتن فرستنده با بسامد 150 مگاهرتز در روش GPR، اثر مخرب رطوبت بر عملکرد این روش و در نهایت، آشکار نکردن اهداف با روش GPR به دلیل تباین کم گذردهی نسبی الکتریکی بین اهداف و زمینه اشاره کرد. با استفاده از داده‌های مقاومت ویژه الکتریکی لوله پلی‌اتیلنی، قسمت‌هایی که خاک سست و متخلخل دارند، آشکارسازی و مناطق مختلف با توجه به رطوبت نسبی موجود در آنها تفکیک شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Characterization of leachate flow using time lapse ground penetrating radar (GPR) and resistivity survey (case study: geophysical test site of Shahrood University of Technology)

نویسندگان [English]

  • Ali Aghaei Kordeshami 1
  • Ali Reza Arab-Amiri 2
  • Abolghasem Kamkar-Rouhani 2
  • Hamid Bizhani 1
1 MS.c. Student, Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
2 Associate Professor, Faculty of Mining, Petroleum and Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

This study investigates the efficiency of different geophysical methods for detecting contaminated zones as well as hidden pipes. There are a number of geophysical techniques that can be useful and beneficial for achieving these purposes. Ground penetrating radar (GPR) and electrical resistivity methods are the most useful approaches for identifying polluted areas and buried features, causing us to utilize such methods in the area. Although GPR and electrical resistivity methods are solely effective for mapping subsurface targets, the integration of these methods might provide us valuable information and valid outcomes. In this paper, electrical resistivity and GPR surveys are conducted and acquired data are modelled to investigate the pollution leakage in the ground. To achieve this aim, a polyethylene pipe with inlet and outlet valves is considered as a tank buried underground in the geophysical test site of Shahrood University of Technology.
    In the first step of the study, the electrical properties of the empty pipe were measured and modelled using electrical resistivity and GPR methods. In the next step, the pipe was filled by the cupric sulfate solution and electrical measurements were performed again. In addition, the electrical properties were investigated by means of electrical resistivity and GPR methods in another area, sitting on alluvial soil, after and before injecting the cupric sulfate solution. It is worth mentioning that the measurements were performed after drying the surface which was humid due to the injection of cupric sulfate to avoid false conductivity on the ground. The designed profiles include four lines on a buried reservoir and five profiles on alluvial soil. However, the 2D modeling results and interpretation of the acquired data along with two (on the buried target) and three (on alluvial soil) survey lines are just presented in this paper. After collecting and interpreting the electrical resistivity and GPR data in the study area, the results are in the form of two-dimensional models of electrical resistivity and GPR cross sections, which have been obtained by use of RES2DINV and Prism2 softwares, respectively. The obtained results revealed that the electrical resistivity method enjoys a relatively good performance in detailed detection. It is also shown that the GPR method is not able to work properly in alluvial soils with high clay and it suffers from the unsuitability of the transmitter antenna with a frequency of 150 MHz and the destructive effect of moisture on the performance. Regarding the obtained outcomes and using electrical resistivity data, ground details such as polyethylene reservoir, loose and porous soil parts and separation of different areas according to the relative humidity in them have been revealed.

کلیدواژه‌ها [English]

  • Electrical resistivity
  • Ground Penetrating Radar (GPR)
  • polyethylene pipe
  • two-dimensional modelling
  • geophysical test site of Shahrood University of Technology

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مجله ژئوفیزیک ایران
دوره 16، شماره 3
آذر 1401
صفحه 125-142

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