Professional Background

# Ph.D. in Hydrology and Hydrogeology, University of Nevada, Reno (1993)
# M.S. in Geological Engineering, University of Nevada, Reno (1987)
# B.S. in Geology/Physics, Eastern Michigan University (1983)

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Teaching

Undergraduate:

* GEY 101 - Introductory Geology: Exploring Planet Earth
* GEY 474 - Hydrogeology

Graduate:

* GEY 674 - Hydrogeology

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Research

Dr. Nicholl's areas of expertise include vadose zone hydrology, environmental fluid mechanics, and geological engineering. His research currently focuses on the study of fluid flow in fractured rocks, with particular emphasis on two-phase flows (i.e., air/water, water/NAPL, and brine/petroleum). This is a highly active area of research, with important implications to a number of high-profile applied problems. Dr. Nicholl and his students are working to develop a fundamental understanding of two-phase flow in fractured rock through a combination of laboratory, field, and numerical experimentation. Please see the publication list below, or email for further details.

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Selected Research Publications

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 Research Letters, 31, L06502, 2004.

Hubbell, J.M., M.J. Nicholl, J.B. Sisson, and D.L. McElroy, "Estimating flux in a deep vadose zone using the Darcian approach", Vadose Zone Journal, 3, 560-569, 2004.

Hubbell, J.M., J.B. Sisson, M.J. Nicholl, and R.G. Taylor, "Well design to reduce barometric pressure effects on water level data in unconfined aquifers", Vadose Zone Journal, 3, 183-189, 2004.

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, 39(12), 1352, 2003.

Wood, T.R., M.J. Nicholl, and R.J. Glass, "Fracture intersections as integrators for unsaturated flow", Geophysical Research Letters, 29(24), 2191, 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, 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, 2002.

Glass, R.J., M.J. Nicholl, and S.E. Pringle, "Unsaturated flow through a fracture-matrix-network: A first experiment", in Bridging the gap between measurement and modeling in heterogeneous media, International Association of Hydraulic Engineering and Research, Madrid, Spain, 2002.

Detwiler, R.L., Glass, R.J., H. Rajaram, and M.J. Nicholl, "Satiated Relative Permeability of Variable-Aperture Fractures", in Bridging the gap between measurement and modeling in heterogeneous media, International Association of Hydraulic Engineering and Research, Madrid, Spain, 2002.

Nicholl, M.J. and R.L. Detwiler, "Simulation of flow and transport in a single fracture: Macroscopic effects of underestimating local head loss", Geophysical Research Letters, 28(23), 4351-54, 2001.

Glass, R.J., H. Rajaram, M.J. Nicholl, and R.L. Detwiler, "The interaction of two fluid phases in fractured media", Current Opinion in Colloid & Interface Science, 6, 223-235, 2001.

Nicholl, M.J. and R.J. Glass, "Simulation of immiscible viscous displacement within the plane of a horizontal fracture", in Rock Mechanics in the National Interest, edited by D. Elsworth, J.P. Tinucci, and K.A. Heasley, 205-210, 1570 pp., Balkema, Lisse, 2001.

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), 393-96, 2000.

Nicholl, M.J., and G.F. Scott, "Teaching Darcy's Law through hands-on experimentation", Journal of Geoscience Education, 48, 216-221, 2000.

Glass, R.J., M.J. Nicholl, and L. Yarrington, "Correction to: 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, 36(7), 1991, 2000.

Nicholl, M.J., H. Rajaram, R.J. Glass, and R. Detwiler, "Saturated flow in a single fracture: Evaluation of the Reynolds Equation in measured aperture fields", Water Resources Research, 35(11), 3361-73, 1999.

Nicholl, M., T. Wikle, T. Brown, J. Nord, and R. Parker, "Water quantity at Chickasaw National Recreation Area", Park Science, 19(2), 30-32, 1999.

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Students

J.M. Hubbell [Ph.D. in progress] "Estimation of flux in the deep vadose zone".

T.R. Wood [Ph.D. in progress] "Dynamics of unsaturated flow at fracture intersections".

J. Diamond [M.S. 2003] "Gravity-driven fingers within a vertical fracture in the presence of a highly sorptive matrix".

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