Abstract
This paper studies the effects of relatively homogeneous (RHWD) and relatively inhomogeneous water distributions (RIWD) in soil compared by varying the water content through a wetting and drying cycle in a tank (1.85m long × 1.55m wide × 1m deep) filled with 750mm thick plant soil. During the cycle, a 900MHz antenna was regularly used to capture GPR radargrams on a buried steel pipe. Hyperbolic reflections of a buried pipe at a fixed position were extracted to measure wave velocities/dielectric constants at different RHWD and RIWD in the wetting and drying cycle. A vertical coaxial-based water content sensor was also installed in a vertical standpipe in the middle of the tank to obtain the vertical water content profile, synchronized with and correlated to the GPR wave velocity/dielectric constant of the soil. The result of cross plotting between the dielectric constant and soil water content shows that the volumetric fraction of water in a porous medium is the sole important factor affecting dielectric properties of soil.
Original language | English |
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Title of host publication | Proceedings of 2016 16th International Conference of Ground Penetrating Radar, GPR 2016 |
Publisher | IEEE |
Pages | 530-535 |
Number of pages | 5 |
ISBN (Electronic) | 9781509051816 |
DOIs | |
Publication status | Published - 20 Sept 2016 |
Event | 16th International Conference of Ground Penetrating Radar, GPR 2016 - Hong Kong Polytechnic University, Hong Kong, Hong Kong Duration: 13 Jun 2016 → 16 Jun 2016 |
Conference
Conference | 16th International Conference of Ground Penetrating Radar, GPR 2016 |
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Country/Territory | Hong Kong |
City | Hong Kong |
Period | 13/06/16 → 16/06/16 |
Keywords
- GPR wave velocity
- Relatively heterogeneous water distribution (RIWD)
- Relatively homogeneous water distributions (RHWD)
- Soil permittivity
ASJC Scopus subject areas
- Signal Processing
- Instrumentation