Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Geostatistical analysis of centimeter-scale hydraulic conductivity variations at the MADE site
Autor Bohling, G.C.; Liu, G.; Knobbe, S.; Reboulet, E.; Hyndman, D.W.; Dietrich, P.; Butler, J.J.;
Journal / Serie Water Resources Research
Erscheinungsjahr 2012
Department MET;
Band/Volume 48
Heft 2
Sprache englisch;
Abstract

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.
ID 12033
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=12033
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