Measuring the advance of a wetting front using cross borehole GPR

Dale F. Rucker, Ty P.A. Ferré

Research output: Contribution to journalConference article

Abstract

Two infiltration experiments were conducted to monitor an advancing wetting front at 2.25 m below ground surface with cross-borehole ground penetrating radar (XBGPR). The focus of the experiment was to understand how XBGPR responds to dielectric permittivities that vary on a scale that is smaller than the antenna length. To test this response, a sharp wetting front was formed by applying water evenly over a 5 m by 5 m area at a rate of 5×10-4 cm/s through porous hoses. The center of XBGPR antennae were placed at a depth of 2.25 m in a pair of vertical, PVC lined access tubes located within the irrigated area. The velocity of the first arrival was converted to moisture content using a standard calibration. The measured water content increased linearly with time during the advance of the wetting front. Through comparison with modeled results of flow in unsaturated media, we demonstrate how water contents are "averaged" along the antennae.

Original languageEnglish (US)
Pages (from-to)176-179
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4758
DOIs
StatePublished - Jan 1 2002
Event9th International Conference on Ground Penetrating Radar - Santa Barbara, CA, United States
Duration: Apr 29 2002May 2 2002

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Keywords

  • Cross-borehole
  • Infiltration

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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