Peer Reviewed Journal Articles

2009

• Detwiler, R. L., H. Rajaram, and R. J. Glass (2009), Interphase mass transfer in variable aperture fractures: Controlling parameters and proposed constitutive relationships, Water Resources Research, 45, W08436, doi:10.1029/2008WR007009, 2009.

2006

• Ji, S-H; Nicholl, M.J.; Glass, R.J.; Lee, K-K, Influence of simple fracture intersections with differing aperture on density-driven immiscible flow: Wetting versus nonwetting flows, Water Resources Research, v.42, no.10, October 2006.

2005

• Nicholl, M.J., and R.J. Glass, Experimental observations of gravity-driven fingering during immiscible displacements within a rough-walled fracture, Vadose Zone Journal, 4 (4): 1123-1151 NOV 2005.
• Detwiler, R., H. Rajaram, and R.J. Glass, Satiated relative permeability of variable aperture fractures, Physical Review E., 71 (3): Art. No. 031114 Part 1 MAR 2005.
• Wood, T.R., M.J. Nicholl, and R.J. Glass, Influence of fracture intersections under unsaturated, low flow conditions, Water Resources Research, 41 (4): Art. No. W04017 APR 27 2005.
• Glass, R.J., J.R. Brainard, and T-C.J. Yeh, Infiltration in unsaturated layered fluvial deposits at Rio Bravo: Macroscopic anisotropy and heterogeneous transport, Vadose Zone Journal, 4 (1): 22-31 FEB 2005.

2004

• LaViolette, R.A., R.J. Glass, D. Peak, and D.L. Stoner, Self organized network of chemical reactions: A Model of contaminated converging and diverging flows in fractured media, Journal of Physical Chemistry B, 108, 19657-19662, 2004.
• Altman, S.J., M. Uchida, V.C. Tidwell, C.M. Boney, B.P. Chambers, Use of X-ray absorption imaging to examine heterogeneous diffusion in fractured crystalline rocks, Journal of Contaminant Hydrology, V69, Issues1-2, p1-26, 2004.
• LaViolette, R.A., and R.J. Glass, Self organized spatial-temporal structure within the fractured vadose zone: Influence of dynamic overloading at fracture intersections, Geophysical Review Letters, 31, L18501, doi:10.1029/2004GL020659, 2004.
• Glass, R.J., and R.A. LaViolette, Self organized spatial-temporal structure within the fractured vadose zone: Influence of fracture intersections, Geophysical Review Letters, 31, L15501, doi:10.1029/2004GL019511, 2004.
• Ji, S.-H., M.J. Nicholl, R.J. Glass, and K.-K. Lee, Influence of a simple fracture intersection on density-driven immiscible flow: Wetting vs. nonwetting flows, Geophysical Research Letters, 31, L14501, doi:10.1029/2004GL020045, 2004.
• Glass, R.J., M.J. Nicholl, H. Rajaram, and B. Andre, Development of slender transport pathways in unsaturated fractured rock: Simulation with Modified Invasion Percolation, Geophysical Review Letters, 31, L06502, doi:10.1029/2003GL019252, 2004.
• Wood, T.R., R.J. Glass, T.R. McJunkin, R.K. Podgorney, R.A. Laviolette, K.S. Noah, D.L. Stoner, R.C. Starr, and K. Baker, Unsaturated Flow Through a Small Fracture-Matrix Network: Part 1, Experimental Observations, Vadose Zone Journal, 3:90-100, 2004.

2003

• Glass, R.J., H. Rajaram, R.L. Detwiler, Immiscible displacements in rough-walled fractures: Competition between roughening by random aperture variations and smoothing by in-plane curvature, Physical Review E, accepted, 2003.
• Glass, R.J, M.J. Nicholl, H. Rajaram, and T.R. Wood, Unsaturated flow through fracture networks: Evolution of liquid phase structure, dynamics, and the critical importance of fracture intersections, Water Resources Research, in press, 2003.
• Detwiler, R., R.J Glass, and W.L. Bourcier, Experimental observations of fracture dissolution: the role of Peclet number on evolving aperture variability, Geophysical Research Letters, 30(12), 1648, doi:10.1029/2003GL017396, 2003.
• Holt, R.M., R.J. Glass, J.M. Sigda, and E.D. Mattson, Influence of centrifugal forces on phase structure in partially saturated media, Geophysical Research Letters, 30(13), 1692, doi:10.1029/2003GL017340, 2003.
• Eliassi, M., and R.J. Glass, Reply to Comment by DPCSS on: On the continuum-scale simulation of gravity-driven fingers in unsaturated porous media: The inadequacy of the Richards equation with standard monotonic constitutive relations and hysteretic equations of state, Water Resources Research, 39(9), 1263, doi:10.1029/2002WR001785, 2003.
• Eliassi, M., and R.J. Glass, Reply to Comment by B&N on: On the continuum-scale simulation of gravity-driven fingers in unsaturated porous media: The inadequacy of the Richards equation with standard monotonic constitutive relations and hysteretic equations of state, Water Resources Research, 39(9), 1250, doi:10.1029/2002WR001753, 2003.
• Ji, S.H., I.W. Yeo, K.K. Lee, and R.J. Glass, Influence of ambient groundwater flow on DNAPL migration in a fracture network: Experiments and simulations, Geophysical Research Letters, 30(10), 1504, doi:10.1029/2003GL017064, 2003.
• Eliassi, M., and R.J. Glass, On the porous continuum-scale simulation of gravity-driven fingers in unsaturated materials: Numerical solution of a hypo-diffusive governing equation that incorporates a hold-back-pile-up effect, Water Resources Research, 39(6), 1167, doi:10.1029/2002WR001535, 2003.
• Tidwell, V.C., R.J. Glass, C. Chocas, G. Barker, and L. Orear. Capillary barrier performance: Experiments in context of Yucca Mountain emplacement drifts, Journal of Contaminant Hydrology, 62-63:287-301, 2003.
• Glass, R.J, and L. Yarrington, Mechanistic modeling of fingering, nonmonotonicity, fragmentation, and pulsation within gravity/buoyant destabilized two-phase/unsaturated flow, Water Resources Research, 39(3), 1058, doi:10.1029/2002WR001542, 2003.
• Holt, R.M., J.L. Wilson, and R.J. Glass, Error in unsaturated stochastic models parameterized with field data, Water Resources Research, 39(2), 1028, doi:10.1029/2001WR000544, 2003.
• LaViolette, R.A,  R.J. Glass, T.R. Wood, T. R. McJunkin, K. S. Noah, R. K. Podgorney, R. C. Starr, and D. L. Stoner, Convergent flow observed in a laboratory-scale unsaturated fracture system, Geophysical Research Letters, 30(2), 1083, doi:10.1029/2002GL015775, 2003.
• Wood, T.R., M.J. Nicholl, and R.J. Glass, Correction to Fracture intersections as integrators for unsaturated flow, Geophysical Research Letters, 30(7), 1350, doi:10.1029/2003GL016904, 2003.

2002

• Wood, T.R., M.J. Nicholl, and R.J. Glass, Fracture intersections as integrators for unsaturated flow, Geophysical Research Letters, 29(24), 2191, doi:10.1029/2002GL015551, 2002.
• Glass, R.J., M.J. Nicholl, S.E. Pringle, and T.R. Wood, Unsaturated flow through a fracture-matrix-network: Dynamic preferential pathways in meso-scale laboratory experiments, Water Resources Research, 38(12), 1281, doi:10.1029/2001WR001002, 2002.
• Yeh, T.-C. J., S. Liu, R.J. Glass, K. Baker, J. Brainard, D. Alumbaugh, and D. LaBreque, A geostatistically based inverse model for electrical resistivity surveys and its applications to vadose zone hydrology, Water Resources Research, 38(12), 1278, doi:10.1029/2001WR001204, 2002.
• Holt, R. M., J.L. Wilson, and R.J. Glass, Spatial bias in field-estimated unsaturated hydraulic properties, Water Resources Research, 38(12), 1311, doi:10.1029/2002WR001336, 2002.
• Alumbaugh, D., P.Y Chang, L.Paprocki, J.R. Brainard, R.J. Glass, and C. Rautman, Estimating initial moisture contents using cross-borehole ground penetrating radar: A study of accuracy and repeatability, Water Resources Research, 38(12), 1309, doi:10.1029/2001WR000754, 2002.
• Eliassi, M., and R.J. Glass, On the porous continuum-scale simulation of gravity-driven fingers in unsaturated materials: Extension of standard theory with an hold-back-pile-up effect, Water Resources Research, 38(11), 1234, doi:10.1029/2001WR001131, 2002.
• Glass, R.J., M.J. Nicholl, A.L. Ramirez, and W.D. Daily, Liquid phase structure within an unsaturated fracture network beneath a surface infiltration event: Field experiment, Water Resources Research, 38(10), 1199, doi:10.1029/2000WR000167, 2002.
• Conrad, S.A., R.J. Glass, and W. Peplinski, DNAPL remediation experiments in macro-heterogeneous sand, Journal of Contaminant Hydrology, 58, 13-49, 2002.
• Pringle, S.E., and R.J. Glass, Double-diffusive finger convection in a solute system at fixed buoyancy ratio: Structural intricacy and length scale growth in Rayleigh space, Journal of Fluid Mechanics, 462, 161-183, 2002. (Also SAND2001-1883J) Photos are B&W
• Pringle, S.E., R.J. Glass, and C.C. Cooper, Double-diffusive finger convection in a Hele-Shaw Cell: An experiment exploring the evolution of concentration fields, length scales, and mass transfer, Transport in Porous Media, 47:2:195-214, 2002.
• Detwiler, R., H. Rajaram, and R.J. Glass, Solute transport in a partially-saturated variable-aperture fracture, Geophysical Research Letters, 29/8/10.1029/2001GL013508, 2002.

2001

• Detwiler R., H. Rajaram, and R.J. Glass, Nonaqueous-phase liquid dissolution in variable-aperture fractures: Development of a depth-averaged computational model and comparison to a physical experiment, Water Resources Research, 37:12:3115-3129, 2001.
• Cooper, C.C., R.J. Glass and S.W. Tyler, Effect of bouyancy ratio on the development of double-diffusive finger convection in a Hele-Shaw Cell, Water Resources Research, 37:9:2323-2332, 2001.
• Glass, R.J., H. Rajaram, M.J. Nicholl, and R.L. Detwiler, The interaction of two fluid phases in fractured media, invited paper, Current Opinion in Colloid & Interface Science, 6:223-235, 2001.
• Eliassi, M. and R.J. Glass, On the continuum-scale simulation of gravity-driven fingers in unsaturated porous media: The inadequacy of tne Richards equation with standard monotonic constitutive relations and hysteretic equations of state, Water Resources Research, 37:8:2019-2036, 2001.
• Mortensen, A.P., R.J. Glass, K. Hollenbeck, and K.H. Jensen, Visualization of micro-scale phase displacement processes in retention and outflow experiments: Nonuniqueness of unsaturated hydraulic properties, Water Resources Research, 37:6:1627-1640, 2001.
• Glass, R.J., S.H. Conrad, and L. Yarrington, Gravity destabilized non-wetting phase invasion in macroheterogeneous porous media: Near pore scale macro modified invasion percolation model, Water Resources Research, 37:5:1197-1207, 2001.
• Zhong, L., A. Mayer, and R.J. Glass, Visualization of surfactant enhanced NAPL mobilization and solubilization in a two-dimensional micro-model, Water Resources Research, 37:3:523-537, 2001.

2000

• Glass, R.J., S.H. Conrad, and W. Peplinski, Gravity destabilized non-wetting phase invasion in macroheterogneous porous media: Experimental observations of invasion dynamics and scale analysis, Water Resources Research, 36:11:3121-3137, 2000.
• Tidwell, V.C., L.C> Meigs, T. Christian-Frear, C.M. Boney, Effects of spatially heterogeneous porosity on matrix diffusion as investigated by X-ray absorption imaging, Journal of Contaminant Hydrology, V42, Issues 2-4, 2000.
• Detwiler, R.L., H. Rajaram, and R.J. Glass, An investigation of the relative importance of Taylor dispersion and macrodispersion in variable aperture fractures, Water Resources Research, 36:7:1611-1625, 2000.
• Nicholl, M.J., H. Rajaram, and R.J. Glass, Factors controlling satiated relative permeability in a partially-saturated horizontal fracture, Geophysical Research Letters, 27:3:393-396, 2000.

1999

• Nicholl, M.J., H. Rajaram, R.J. Glass, and R.L. Detwiler, Saturated flow in a single fracture: Evaluation of the Reynolds Equation in measured aperture fields, Water Resources Research, 35:11:3361-3374, 1999.
• Detwiler, R.L., S.E. Pringle, and R.J. Glass, Measurement of fracture aperture fields using transmitted light: An evaluation of measurement errors and their influence on simulations of flow and transport through a single fracture, Water Resources Research, 35:9:2605-2617, 1999. (and SAND99-1135J)

1998

• Glass, R.J., M.J. Nicholl, and L Yarrington, A modified invasion percolation model for low-capillary number immiscible displacements in horizontal rough-walled fractures: Influence of local in-plane curvature, Water Resources Research, 34:12:3215-3234, 1998. (plus a correction in 2000)
• Stockman, H.W., R.J. Glass, C.C. Cooper, and H. Rajaram, Accuracy and computational efficiency in 3D dispersion via Lattice-Boltzmann: Models for dispersion in rough fractures and double-diffusive fingering. Int. J. Modern Phys. C, 9:8:1545-1557, 1998.

1997

• Cooper, C.A., R.J. Glass, and S.W. Tyler, Experimental investigation of the stability boundary for double-diffusive finger convection in a Hele-Shaw cell, Water Resources Research, 33:4:517-526, 1997

1996

• Glass, R.J., and M.J. Nicholl, Physics of gravity driven fingering of immiscible fluids within porous media: An overview of current understanding and selected complicating factors, Geoderma, 70:133-163, 1996.
• Glass, R.J., and L. Yarrington, Simulation of gravity-driven fingering in porous media using a modified invasion percolation model, Geoderma, 70:231-252, 1996.

1995

• Carey, A.E., S.W. Wheatcraft, R.J. Glass, and J.P. O’Rouke, Non Fickian ionic diffusion across high concentration gradients, Water Resources Research, 31:9:2213-2218, 1995.
• Glass, R.J., and M.J. Nicholl, Quantitative visualization of entrapped phase dissolution within a horizontal flowing fracture, Geophysical Research Letters, 22:11:1413-1416, 1995.
• Glass, R.J., M.J. Nicholl and V.C. Tidwell, Challenging models for flow in unsaturated, fractured rock through exploration of small scale processes, Geophysical Research Letters, 22:11:1457-1460, 1995.
• Tidwell, V.T., R.J. Glass, and W. Peplinski, Laboratory investigation of matrix imbibition from a flowing fracture, Geophysical Research Letters, 22:11:1405-1408, 1995.

1994

• Tidwell, V.C. and R.J. Glass, X-ray and visible light transmission for laboratory measurement of two-dimensional, saturation fields in thin slab systems, Water Resources Research, 30:11:2873-2882, 1994.
• Nicholl, M.J., R.J. Glass, and S.W. Wheatcraft, Gravity-driven infiltration instability in initially dry non-horizontal fractures,  Water Resources Research, 30:9:2533-2546, 1994.

1991

• Glass, R.J., J.-Y. Parlange, and T.S. Steenhuis, Two-phase immiscible displacement in porous media: Stability analysis of three-dimensional, axisymmetric disturbances, Water Resources Research, 27:1947-1956, 1991.

1990

• Glass, R.J., S. Cann, J. King, N. Bailey, J-Y. Parlange and T.S. Steenhuis, Wetting front instability in unsaturated porous media: A three- dimensional study in initially dry sand, Transport in Porous Media, 5(3):247-268, 1990.

1989

• Glass, R.J., G.H. Oosting and T.S. Steenhuis, Preferential solute transport in layered homogeneous sands as a consequence of wetting front instability, Journal of Hydrology, 110:87-105, 1989.
• Glass, R.J., J-Y. Parlange and T.S. Steenhuis, Wetting front instability 1: Theoretical discussion and dimensional analysis, Water Resources Research, 25:1187-1194, 1989.
• Glass, R.J., T.S. Steenhuis and J-Y. Parlange, Wetting front instability 2: Experimental determination of relationships between system parameters and two-dimensional unstable flow field behavior in initially dry porous media, Water Resources Research, 25:1195-1207, 1989.
• Glass, R.J., T.S. Steenhuis and J-Y. Parlange, Mechanism for finger persistence in homogeneous unsaturated porous media: Theory and verification, Soil Science, 148:60-70, 1989.

1988

• Glass, R.J., T.S. Steenhuis and J-Y. Parlange, Wetting front instability as a rapid and far-reaching hydrologic process in the vadose zone, Journal of Contaminant Hydrology, 3(2-4):207-226, 1988.