Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1029/2011WR010791
Title (Primary) Geostatistical analysis of centimeter-scale hydraulic conductivity variations at the MADE site
Author Bohling, G.C.; Liu, G.; Knobbe, S.; Reboulet, E.; Hyndman, D.W.; Dietrich, P. ORCID logo ; Butler, J.J.
Journal Water Resources Research
Year 2012
Department MET
Volume 48
Issue 2
Page From W02525
Language englisch

Spatial variations in hydraulic conductivity (K) provide critical controls on solute transport in the subsurface. Recently, new direct-push tools were developed for high-resolution characterization of K variations in unconsolidated settings. These tools were applied to obtain 58 profiles (vertical resolution of 1.5 cm) from the heavily studied MAcro Dispersion Experiment (MADE) site to characterize detailed K variations at the site. We compare the data from these 58 profiles with those from the 67 flowmeter profiles that have served as the primary basis for characterizing the heterogeneous aquifer at the site. Overall, the patterns of variation displayed by the direct-push data are quite similar to those in the flowmeter data, although the direct-push K values are, on average, roughly a factor of five lower than the flowmeter values. This discrepancy appears to be attributable, at least in part, to opposite biases between the two methods, with the current versions of the direct-push tools underestimating K in the highly permeable upper portions of the aquifer and the flowmeter overestimating K in the less permeable lower portions of the aquifer. The vertically averaged K values from a series of direct-push logs in the vicinity of two pumping tests at the site are consistent with the K estimates from those tests, providing evidence that the direct-push estimates are of a reasonable magnitude. The results of this field demonstration show that direct-push profiling methods have the potential to characterize highly heterogeneous aquifers with a speed and resolution that has not previously been possible.
Persistent UFZ Identifier
Bohling, G.C., Liu, G., Knobbe, S., Reboulet, E., Hyndman, D.W., Dietrich, P., Butler, J.J. (2012):
Geostatistical analysis of centimeter-scale hydraulic conductivity variations at the MADE site
Water Resour. Res. 48 (2), W02525