Improved hydrogeophysical characterization using joint inversion of cross-hole electrical resistance and ground-penetrating radar traveltime data

Details

Serval ID
serval:BIB_4F14EE49F607
Type
Article: article from journal or magazin.
Collection
Publications
Title
Improved hydrogeophysical characterization using joint inversion of cross-hole electrical resistance and ground-penetrating radar traveltime data
Journal
Water resources research
Author(s)
Linde N., Binley A., Tryggvason A., Pedersen L.B., Revil A.
ISSN-L
0043-1397
Publication state
Published
Issued date
2006
Volume
42
Pages
W12404
Language
english
Notes
ISI:000242952800001
Abstract
Appropriate regularizations of geophysical inverse problems and joint
inversion of different data types improve geophysical models and
increase their usefulness in hydrogeological studies. We have developed
an efficient method to calculate stochastic regularization operators for
given geostatistical models. The method, which combines circulant
embedding and the diagonalization theorem of circulant matrices, is
applicable for stationary geostatistical models when the grid
discretization, in each spatial direction, is uniform in the volume of
interest. We also used a structural approach to jointly invert
cross-hole electrical resistance and ground-penetrating radar traveltime
data in three dimensions. The two models are coupled by assuming, at all
points, that the cross product of the gradients of the two models is
zero. No petrophysical relationship between electrical conductivity and
relative permittivity is assumed but is instead obtained as a by-product
of the inversion. The approach has been applied to data collected in a
U. K. sandstone aquifer in order to improve characterization of the
vadose zone hydrostratigraphy. By analyzing scatterplots of electrical
conductivity versus relative permittivity together with petrophysical
models a zonation could be obtained with corresponding estimates of the
electrical formation factor, the water content, and the effective grain
radius of the sediments. The approach provides greater insight into the
hydrogeological characteristics of the subsurface than by using
conventional geophysical inversion methods.
Create date
30/03/2012 11:57
Last modification date
20/08/2019 14:04
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