Visual Characteristics of Conically Shaped Voids in Ground Penetrating Radar Surveys

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Abstract

Ground Penetrating Radar (GPR) is an electromagnetic inspection method that can explore the underground environment and it is commonly used to locate targets that have a circular cross-section, such as pipelines. Therefore, the appearance of such targets in GPR survey results (radargrams) has received a lot of attention in the literature. However, the voids that form due to sand erosion, ground subsidence, and leakages are usually conical in their shape. Still, less research has focused on studying the appearance of subsurface conical voids. This study, therefore, aims to specify the visual characteristics of conical air voids in radargrams. To this end, we model subsurface voids with pyramid and inverted pyramid cross-sections of various dimensions. Analysing the resulting patterns indicates that the geometry of a pyramid cross-section can be fully described by four hyperbolas in the radargrams. For an inverted pyramid cross-section, the horizontal spread can be determined by two hyperbolas. But the radargram cannot provide information about the vertical spread of these voids. Our results contribute to structural health monitoring of the urban underground environment by providing a primary basis for detecting conical voids under the roads and around buried facilities such as sewer pipes.

Original languageEnglish
Title of host publication5th Asia Pacific Meeting on Near Surface Geoscience and Engineering, NSGE 2023
PublisherEuropean Association of Geoscientists and Engineers
Pages1-5
Number of pages5
ISBN (Electronic)9789462824577
DOIs
Publication statusPublished - 2023
Event5th Asia Pacific Meeting on Near Surface Geoscience and Engineering, NSGE 2023 - GIS NTU Convention Center, Taipei, Taiwan
Duration: 6 Mar 20239 Mar 2023
Conference number: 5

Conference

Conference5th Asia Pacific Meeting on Near Surface Geoscience and Engineering, NSGE 2023
Abbreviated titleNSGE 2023
Country/TerritoryTaiwan
CityTaipei
Period6/03/239/03/23

Keywords

  • NLA

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