BGPRconstruct: A MATLAB® ray-tracing program for nonlinear inversion of first arrival travel time data from zero-offset borehole radar

Dale F. Rucker, Ty P.A. Ferré

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A MATLAB program was developed to invert first arrival travel time picks from zero offset profiling borehole ground penetrating radar traces to obtain the electromagnetic wave propagation velocities in soil. Zero-offset profiling refers to a mode of operation wherein the centers of the bistatic antennae being lowered to the same depth below ground for each measurement. The inversion uses a simulated annealing optimization routine, whereby the model attempts to reduce the root mean square error between the measured and modeled travel time by perturbing the velocity in a ray tracing routine. Measurement uncertainty is incorporated through the presentation of the ensemble mean and standard deviation from the results of a Monte Carlo simulation. The program features a pre-processor to modify or delete travel time information from the profile before inversion and post-processing through presentation of the ensemble statistics of the water contents inferred from the velocity profile. The program includes a novel application of a graphical user interface to animate the velocity fitting routine.

Original languageEnglish (US)
Pages (from-to)767-776
Number of pages10
JournalComputers and Geosciences
Volume30
Issue number7
DOIs
StatePublished - Aug 1 2004

Keywords

  • Graphical user interface
  • Monte Carlo
  • Optimization
  • Simulated annealing
  • Uncertainty

ASJC Scopus subject areas

  • Information Systems
  • Computers in Earth Sciences

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