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Closed loop hydrogeophysical inversion of time-lapse GPR data to determine hydraulic properties of a sandy soil

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Author: Slob, E. · Lambot, S. · Rhebergen, J.B. · Lopera, O. · Vereecken, H.
Type:article
Date:2008
Institution: TNO Defensie en Veiligheid
Source:SEG Technical Program Expanded Abstracts, 1, 27, 1183-1187
Identifier: 280056
doi: doi:10.1190/1.3059132
Keywords: Geosciences · Dynamic · GPR · Hydrology · Inversion · Monitoring

Abstract

A closed loop hydrogeophysical inversion procedure has been developed and tested in an outdoor test site facility to investigate its effectiveness in reconstructing hydraulic properties of a sandy soil under controlled conditions. We use global optimization followed by a local routine, which involves a large number of forward models to be computed. Forward model computation speed up was established up to one order of magnitude. The final results show that the parameters describing the water content profile are well estimated, but the obtained hydraulic conductivity seems to correspond to the value excluding macropore flow.