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Title: | Field validation of water-pipe leakage detection through spatial and time-lapse analysis of GPR wave velocity | Authors: | Cheung, BWY Lai, WWL |
Issue Date: | Jun-2019 | Source: | Near surface geophysics, June 2019, v. 17, no. 3, p. 231-246 | Abstract: | Detection of leakage in a buried water pipe is a crucial issue, as underground pipes become aged and these pipes are often used as pathways for aggressive chemical agents. Non-destructive geophysical methods for identifying such underground leakages are of vital importance. Leakage detection in buried water pipes is sometimes carried out through specific acoustic methods. In this research, we have used ground-penetrating radar as an alternative to such acoustic methods, because of the high sensitivity of electromagnetic waves to the presence of water in soil. This paper presents a methodology, illustrated by field-scale ground-penetrating radar experiments. Four water leakage points in a buried, ductile, iron, main-water pipe were pre-designed within a full-scale (20 m long × 10 m wide) experimental set up. This facility was paved half by reinforced concrete and half by other pavement blocks. Four ground-penetrating radar antennae with five nominal frequencies 200, 250, 400, 600 and 900 MHz were tested. Using a modified algorithm for common offset ground-penetrating radar antennae, in this work, we measure the changes in electromagnetic wave velocity and wave reverberation, which sense upward and downward leakages, respectively. Leakages could be identified most clearly in the 600 MHz ground-penetrating radar data. Our result suggests two potential applications in terms of detecting and defining the extent of multiple leakages in old water pipes, and testing and commissioning new pipes before and after pressurized tests. | Keywords: | Field validation GPR Water pipe leakage |
Publisher: | Wiley-VCH Verlag GmbH & Co. KGaA | Journal: | Near surface geophysics | ISSN: | 1569-4445 | EISSN: | 1873-0604 | DOI: | 10.1002/nsg.12041 | Rights: | © 2019 European Association of Geoscientists & Engineers This is the peer reviewed version of the following article: Cheung, B. W. Y., & Lai, W. W. L. (2019). Field validation of water‐pipe leakage detection through spatial and time‐lapse analysis of GPR wave velocity. Near Surface Geophysics, 17(3-GPR in Civil and Environmental Engineering: Recent Methodological Advances), 231-246, which has been published in final form at https://doi.org/10.1002/nsg.12041. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
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Cheung_Field_Validation_Water-Pipe.pdf | Pre-Published version | 1.06 MB | Adobe PDF | View/Open |
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