• Title/Summary/Keyword: 지구물리탐사 기법

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Focusing and Interferometry of a GB-SAR System (GB-SAR 시스템의 영상화 및 간섭기법)

  • Lee, Hoon-Yol;Cho, Seong-Jun;Sung, Nak-Hoon;Kim, Jung-Ho
    • 한국지구물리탐사학회:학술대회논문집
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    • 2007.06a
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    • pp.145-150
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    • 2007
  • We briefly introduce the theory of GB-SAR focusing and interferometry. Deramp-FFT algorithm is evaluated as a far-range, partial focusing method along with its limitations in the near-range application. Various interferometric configurations with temporal, spatial, and/or frequency baselines are also discussed.

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Application of Geophysical Exploration Methods to Seepage Bone Investigation of Dam Structures (제방누수조사에의 물리탐사기법의 활용(쌍극자배열 전기비저항탐사와 SP탐사를 중심으로))

  • Won Jong-Geun;Song Sung-Ho
    • 한국지구물리탐사학회:학술대회논문집
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    • 1999.08a
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    • pp.240-257
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    • 1999
  • More than 16 percent of the total 18,032 reservoirs over the country were reported to have leakage problems and need to be improved. Recently, a great deal of progress was made in geophysical survey techniques, particularly in electrical resistivity, and the techniques are used for variety of Purposes in groundwater and dam management due to its economical advantages. This document describes the re-evaluation of existing resistivity data including newly surveyed data, mapping of modeled value in 2-D analysis to locate seepage pathways, This contains also discussion results of more than eighteen years of professional experiences in the field of dam efficiency improvement. In comparison of surface resistivity data with several soil analysis data in laboratory, it is evident that the surface resistivity value shows a qualitative proportionality with the sand contents of the filling materials in earth dam. The result from the study also indicates that the SP method in subsurface investigation is effective to detect seepage in earth filled dam as well as piping through rock/earthfill dike.

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Integrated Application of GPR, IE and IR Methods to Detection of the Rear Cavity of Concrete (콘크리트 배면공동 탐지를 위한 GPR, IE 및 IR기법의 복합 적용)

  • Noh, Myung-Gun;Oh, Seok-Hoon;Jang, Bong-Seok
    • Geophysics and Geophysical Exploration
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    • v.12 no.4
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    • pp.338-346
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    • 2009
  • Integrated analysis of GPR, impact echo (IE) and impulse response (IR) was performed to detect the rear cavity of concrete for a test-bed which was made with the same scale and component ratio to the real concrete structure. The test-bed was designed to be capable of observing various response reflecting the existence of iron reinforcing bar and cavity. GPR survey did not clearly resolve the existence of the cavity, although distinguishable responses were observed in the presence of the cavity. In contrast, IE and IR method showed distinct responses, indicating the existence of the cavity. Finally, integrated application of the three methods makes it possible to exactly identify the location of the cavity, although the iron reinforcing bar made a little variation of response.

Prediction of Ground Condition and Evaluation of its Uncertainty by Simulated Annealing (모의 담금질 기법을 이용한 지반 조건 추정 및 불확실성 평가에 관한 연구)

  • Ryu Dong-Woo
    • Tunnel and Underground Space
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    • v.15 no.4 s.57
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    • pp.275-287
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    • 2005
  • At the planning and design stages of a development of underground space or tunneling project, the information regarding ground conditions is very important to enhance economical efficiency and overall safety In general, the information can be expressed using RMR or Q-system and with the geophysical exploration image. RMR or Q-system can provide direct information of rock mass in a local scale for the design scheme. Oppositely, the image of geophysical exploration can provide an exthaustive but indirect information. These two types of the information have inherent uncertainties from various sources and are given in different scales and with their own physical meanings. Recently, RMR has been estimated in unsampled areas based on given data using geostatistical methods like Kriging and conditional simulation. In this study, simulated annealing(SA) is applied to overcome the shortcomings of Kriging methods or conditional simulations just using a primary variable. Using this technique, RMR and the image of geophysical exploration can be integrated to construct the spatial distribution of RM and to evaluate its uncertainty. The SA method was applied to solve an optimization problem with constraints. We have suggested the practical procedure of the SA technique for the uncertainty evaluation of RMR and also demonstrated this technique through an application, where it was used to identify the spatial distribution of RMR and quantify the uncertainty. For a geotechnical application, the objective functions of SA are defined using statistical models of RMR and the correlations between RMR and the reference image. The applicability and validity of this application are examined and then the result of uncertainty evaluation can be used to optimize the tunnel layout.

Aeromagnetic Exploration using Unmanned Aerial Vehicles: Current and Future Trends (무인항공기를 활용한 항공자력탐사: 연구 동향 및 향후 과제)

  • Kim, Bona
    • Geophysics and Geophysical Exploration
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    • v.23 no.3
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    • pp.178-191
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    • 2020
  • Unmanned aerial vehicle (UAV) technologies have grown rapidly over the past decade. Simultaneously, there is an increasing need for efficient high-resolution exploration techniques in complex environments. As a result, exploration technology using UAVs is gaining attention as an efficient method to complement and replace existing exploration technologies. In particular, magnetic exploration technology with UAVs is rapidly gaining ground in the field of exploration and is expected to be actively used in this field in the future. To properly use such technology in domestic exploration, it is necessary to review the latest research trends. Accordingly, this paper introduces the current state of UAV-based magnetic exploration technology studies and, based on this, discusses future research directions.

Datuming by Wavefield Depth Extrapolation (파동장 외삽을 이용한 데이터밍)

  • Ji Jun
    • Geophysics and Geophysical Exploration
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    • v.1 no.2
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    • pp.116-126
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    • 1998
  • I present a datuming scheme for poststack data that uses wavefield depth extrapolation. The method I have developed allows the use of any depth extrapolation technique, such as phase-shift, split-step, and finite-difference extrapolation. I derive the datuming algorithms by transposing and taking the complex conjugate (i.e. taking adjoint) of the corresponding forward modeling operator, which does upward extrapolation from a flat surface to an irregular surface. The exact adjoint relation between the forward modeling operator and the datuming operator is demonstrated algebraically. Testing the poststack datuming algorithms with synthetic data, using several depth extrapolation algorithms, has shown that the method works well.

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Geostatistical Approach to Integrated Modeling of Iron Mine for Evaluation of Ore Body (철광산의 광체 평가를 위한 지구통계학적 복합 모델링)

  • Ahn, Taegyu;Oh, Seokhoon;Kim, Kiyeon;Suh, Baeksoo
    • Geophysics and Geophysical Exploration
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    • v.15 no.4
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    • pp.177-189
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    • 2012
  • Evaluation of three-dimensional ore body modeling has been performed by applying the geostatistical integration technique to multiple geophysical (electrical resistivity, MT) and geological (borehole data, physical properties of core) information. It was available to analyze the resistivity range in borehole and other area through multiple geophysical data. A correlation between resistivity and density from physical properties test of core was also analyzed. In the case study results, the resistivity value of ore body is decreased contrast to increase of the density, which seems to be related to a reason that the ore body (magnetite) includes heavy conductive component (Fe) in itself. Based on the lab test of physical properties in iron mine region, various geophysical, geological and borehole data were used to provide ore body modeling, that is electrical resistivity, MT, physical properties data, borehole data and grade data obtained from borehole data. Of the various geostatistical techniques for the integrated data analysis, in this study, the SGS (sequential Gaussian simulation) method was applied to describe the varying non-homogeneity depending on region through the realization that maintains the mean and variance. With the geostatistical simulation results of geophysical, geological and grade data, the location of residual ore body and ore body which is previously reported was confirmed. In addition, another highly probable region of iron ore bodies was estimated deeper depth in study area through integrated modeling.