Comparative study of methods to estimate hydraulic parameters in the hydraulically undisturbed Opalinus Clay (Switzerland)

Abstract

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Bayesian inversion of a chloride profile obtained in the hydraulically undisturbed Opalinus Clay: Mass transport and paleo-hydrological implications

“…Nagra's investigations in deep boreholes at Riniken, Weiach, Schafisheim and Benken revealed that the tectonically disturbed zones are 6 hydraulically similar to the undeformed matrix (Johns et al 1994;Gautschi 2001a). This conclusion was also confirmed by hydraulic investigation in the BDB-1 borehole at Mont Terri (Yu et al, 2017).…”

“…Peclet calculations require equivalent transport parameters (harmonic means across the formation, perpendicular to the bedding). Using the data of this study and of Yu et al (2017), a harmonic mean of 10-m s-and 1.85 x 10-m s-is found for De and K. Using these values for an equivalent NaCl (v = 2) system and sc between 0.036 and 0.081 (Noy et al, 2004) yields a Peclet number of between 0.6 and 0.8. It can thus be concluded that transport is likely dominated by diffusion for the Opalinus Clay.…”

Utilizing the Impact of Earth and Atmospheric Tides on Groundwater Systems: A Review Reveals the Future Potential

“…The papers of Bredehoeft (), Hsieh et al (), and Cutillo and Bredehoeft () now form the basis for several works expanding the method and our understanding of tidal analysis. Two such papers are Yu et al () and Vinogradov et al (). Yu et al () investigated the use of ET and found that it was unable to evaluate hydraulic conductivity in a fine‐grained low‐permeability unit in comparison to hydraulic in situ testing.…”

“…Two such papers are Yu et al () and Vinogradov et al (). Yu et al () investigated the use of ET and found that it was unable to evaluate hydraulic conductivity in a fine‐grained low‐permeability unit in comparison to hydraulic in situ testing. However, tidal analysis provided reasonable values for specific storage and effective porosity.…”

Analytical Expressions for Thermo‐Osmotic Permeability of Clays

“…This suggests a possible overestimation by about 1 order of magnitude, which can be explained by the difficult interpretation of an in situ experiment which is far less constrained (in terms of boundary conditions and effective gradients) than experiments on core samples. It should also be mentioned here that the hydraulic conductivity is often known within 1 order of magnitude in such complex natural media (see, e.g., Yu et al, ).…”