Field Validation of Water Pipe Leak by Spatial and Time-lapsed Measurement of GPR Wave Velocity

Bella Wei Yat Cheung, Wallace Wai Lok Lai

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)

Abstract

GPR has great potential in investigating water leak and water seepage because of its sensitivity to water. Given water as a dominant factor affecting reflection strength, wave propagation velocity of radar and absorption of high frequency part in spectral content for the non-metallic substance, thus this feature can be used to characterize water leak and seepage. This paper studies the phenomenon of subsurface water leak and demonstrates the experimental effort of pinpointing the water leaks of a buried water mains via a field-scale water leakage experiment in a designated site area (20m long × 10m wide) by analyzing change in GPR's wave propagation velocity. In the site, a ductile iron (D.I.) pipe with four displaced joints were buried and overlaid by concrete and paving blocks. Results obtained by IDS antenna with nominal center frequency of 600MHz were used to study and validate the effects of water leakage by velocity analysis based on [1]. The GPR wave propagation velocity analysis and imaging are based on the GPR data acquired before and after the water injection to map the location of leak points. With the reliable result attained from the velocity analysis, it is validated that the leak points of the pipe could be identified and verified by comparing the velocity profile and providing an accurate method for engineers to locate pipe leak.

Original languageEnglish
Title of host publication2018 17th International Conference on Ground Penetrating Radar, GPR 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538657775
DOIs
Publication statusPublished - 20 Aug 2018
Event17th International Conference on Ground Penetrating Radar, GPR 2018 - Rapperswil, Switzerland
Duration: 18 Jun 201821 Jun 2018

Publication series

Name2018 17th International Conference on Ground Penetrating Radar, GPR 2018

Conference

Conference17th International Conference on Ground Penetrating Radar, GPR 2018
Country/TerritorySwitzerland
CityRapperswil
Period18/06/1821/06/18

Keywords

  • GPR velocity analysis
  • Ground penetrating radar
  • pipe leakage
  • velocity profile

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Instrumentation

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