Geofluids Home

Publications with at least one author from the
Geofluids Research Group

bold = author from the geofluids research group at UMN
bold* = postdoc author from the geofluids research group at UMN
bold underlined = student author from the geofluids research group at UMN

Refereed Publications           (submitted or in-preparation)

• Appana, R., and M.O. Saar, InSAR-constrained poroelastic response to artificial aquifer recharge in Coachella Valley, California: Insights for San Andreas Fault permeabilities, to be submitted approximately in January, 2009.

• Saar, M.O., and J.L. Andrews, The hybrid boundary condition, a new approach for simulation of advective heat or solute discharge, to be submitted approximately in December, 2008.

• Davis, M.A., S.D.C. Walsh, and M.O. Saar, Matching permeability and other macroscopic properties in numerical reconstructions of isotropic and anisotropic composite materials, to be submitted in Dec. 2008.

• Saar, M.O., and S.C. Alexander*, Improving Jacob-type pumping-test aquifer analyses by selection of appropriate well distance and Taylor series expansion parameters, to be submitted to Water Resources Research, November/December, 2008.

• Walsh*, S.D.C., and M.O. Saar, A new Macroscale lattice-Boltzmann method for solute transport simulations through heterogeneous porous media, to be submitted in Nov. 2008.

• Walsh*, S.D.C., and M.O. Saar, P. Bailey, and D.J. Lilja, Accelerating Geo-Science and Engineering System Simulations on Graphics Hardware, submitted to Computers & Geosciences, Sep., 2008.

Refereed Publications           (published or in press)

• Walsh*, S.D.C., and M.O. Saar, Magma yield stress and permeability: Insights from multiphase percolation theory, J. Volcanol. Geoth. Res., doi: 10.1016/j.volgeores.2008.07.009, 2008.
  abstract | pdf-preprint (578 KB)

• Walsh*, S.D.C., H. Burwinkle, and M.O. Saar, A new partial-bounceback lattice-Boltzmann method for fluid flow through heterogeneous media, Comput. Geosci., doi:10.1016/j.cageo.2008.05.004, 2008.
  abstract | pdf-preprint (336 KB)

• Walsh*, S.D.C., S.C. Alexander, and M.O. Saar, Lattice-Boltzmann simulations of carbonate systems, invited, peer-review proceedings paper, 11th Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst, in press, 2008.

• Walsh*, S.D.C., and M.O. Saar, Numerical Models of Stiffness and Yield Stress Growth in Crystal-Melt Suspensions, Earth Planet. Sci. Lett., doi:10.1016/j.epsl.2007.11.028, 2008.
  abstract | pdf-paper (661 KB)

• Edwards, R.A., B. Rodriguez-Brito, L. Wegley, M. Haynes, M. Breitbart, D.M. Peterson, M.O. Saar, S.C. Alexander, E.C. Alexander Jr., F. Rohwer, Using pyrosequencing to shed light on deep mine microbial ecology under extreme hydrogeological conditions, BMC Genomics, doi:10.1186/1471-2164-7-57, 2006.
  abstract | pdf-paper (1.8 MB)

• Christiansen, L.B., S. Hurwitz, M.O. Saar, S.E. Ingebritsen, P.A. Hsieh, Seasonal seismicity at western United States volcanic centers, Earth. Planet. Sci. Lett., 240, 307-321, 2005.
  abstract | pdf-paper (505 KB)

• Saar, M.O., M.C. Castro, C.M. Hall, M. Manga, and T.P. Rose, Quantifying magmatic, crustal, and atmospheric Helium contributions to volcanic aquifers using all stable noble gases: Implications for magmatism and groundwater flow, Geochem. Geophys. Geosyst., Vol. 6, Nr. 3, Q03008, doi:10.1029/2004GC000828, 2005.
  abstract | pdf-paper (1.1 MB)

• Jellinek, A.M., M. Manga, and M. O. Saar, Did melting glaciers cause volcanic eruptions in eastern California? Probing the mechanics of dike formation, J. Geophys. Res., Vol. 109, Nr. B9, B09206, doi:10.1029/2004JB002978, 2004.
  abstract | pdf-paper (832 KB)

• Saar, M.O. and M. Manga, Depth dependence of permeability in the Oregon Cascades inferred from hydrogeologic, thermal, seismic, and magmatic modeling constraints, J. Geophys. Res., Vol. 109, Nr. B4, B04204, doi:10.1029/2003JB002855, 2004.
  abstract | pdf-paper (2.1 MB)

• Saar, M.O. and M. Manga, Seismicity induced by seasonal groundwater recharge at Mt. Hood, Oregon, Earth Planet. Sci. Lett., Vol. 214, 605-618, 2003
  abstract | pdf-paper (1.2 MB)

• Saar, M.O. and M. Manga, Continuum percolation for randomly oriented soft-core prisms, Phys. Rev. E, Vol. 65, 056131-1 to 6, 2002.
  abstract | pdf-paper (286 KB)

• Saar, M.O., M. Manga, K. Cashman, and S. Fremouw, Numerical models of the onset of yield strength in crystal-melt suspensions, Earth Planet. Sci. Lett., Vol. 187, 367-379, 2001.
  abstract | pdf-paper (859 KB)

• Saar, M.O., and M. Manga, Permeability-porosity relationship in vesicular basalts, Geophys. Res. Lett., Vol. 26, No. 1, 111-114, 1999.
  abstract | pdf-paper (168 KB)

Non-Refereed Publications           (theses, dissertations, reports)

• Andrews, J.L., Coupled Heat and Helium Transport in Groundwater, M.S. thesis, 55 pp., University of Minnesota - Minneapolis, 2008. Thesis Adviser: M.O. Saar
  pdf-thesis (3 MB)

• Randolph, J.B., and M.O. Saar, Preliminary numerical modeling of CO2 injection and storage in deep saline aquifers: Current research, scenarios, and required data, in Potential capacity for geologic carbon sequestration in the Midcontinent Rift System in Minnesota, Thorleifson, L. H., ed., Minnesota Geological Survey Open File Report OFR-08-01, 138 p, 2008.
  pdf-report (7.4 MB)

• Andrews, J.L., S. Finsterle, and M.O. Saar, Mass- and Temperature-Dependent Diffusion Coefficients of Light Noble Gases for the TOUGH2-EOSN Module, Technical Report LBNL-62595, Lawrence Berkeley National Laboratory, Berkeley, CA, April 2007.
  pdf-report (284 KB)

• Andrews, J.L., and M.O. Saar, Coupling and decoupling of heat and helium transport in a geothermal reservoir, Proceedings, TOUGH Symposium 2006, Lawrence Berkeley National Laboratory, Berkeley, CA, 9 p., May 15-17, 2006.
  pdf-proceedings (867 KB)

• Saar, M.O., Geological fluid mechanics models at various scales, Ph.D. dissertation, 153 pp., University of California - Berkeley, 2003.
  pdf-dissertation (5.5 MB)

• Saar, M.O. and M. Manga, Intrinsic permeability, porosity, and microstructure of Holocene vesicular basaltic andesites in the Oregon Cascades, Oregon Geology, Vol. 61, No. 4, 87-88, 1999.
  pdf-journal (6.1 MB) \

• Saar, M.O., The relationship between permeability, porosity and microstructure in vesicular basalts, M.S. thesis, 91 pp., University of Oregon, 1998.
  pdf-thesis (3 MB)

Abstracts           (for conference presentations as talks or posters)

• Covington*, M.D., S.D.C. Walsh*, C.M. Wicks, and M.O. Saar, Modeling the Effects of Variable Recharge and Conduit Geometry on Flow Through Karstic Aquifers, Eos Trans. AGU, Fall Meet. Suppl., 2008.

• Saar, M.O., and S.D.C. Walsh*, Preferred Flow Path Development in Heterogeneous Porous Media During Reactive Flow: A Macro-Scale Lattice-Boltzmann Method, Eos Trans. AGU, Fall Meet. Suppl., 2008.

• Randolph, J.B., and M.O. Saar, Geologic CO2 sequestration in saline aquifers accounting for dual permeability/porosity environments, Eos Trans. AGU, Fall Meet. Suppl., 2008.

• Walsh*, S.D.C., M.O. Saar, P. Bailey, and D.J. Lilja, Cheaper and faster: How to have your cake and eat it too with GPU implementations of Earth Science simulations, Eos Trans. AGU, Fall Meet. Suppl., 2008.

• Davis, M.A., S.D.C. Walsh*, M.O. Saar, and J.J. Roberts, Magma Permeability Estimates From X-ray Tomography Scans Eos Trans. AGU, Fall Meet. Suppl., 2008.

• Anderson, K.J., S.D.C. Walsh*, and M.O. Saar, Methods of Permeability Calculation for Vesicular Materials, Eos Trans. AGU, Fall Meet. Suppl., Abstract V21C-0726, poster, 2007.

• Saar, M.O. and S.D.C. Walsh*, Simulations of Stiffness and Yield Stress Growth in Crystal Networks, Eos Trans. AGU, Fall Meet. Suppl., Abstract V13E-04, talk, 2007.

• Davis, M.A., S.D.C. Walsh*, M.O. Saar, and J.J. Roberts, Numerical Reconstructions of Volcanic Tephra: Using Tomography and Two-Point Correlation Functions to Determine Magma Permeability, Eos Trans. AGU, Fall Meet. Suppl., Abstract V12B-02, talk, 2007.

• Appana, R., and M.O. Saar, Determination of Aquifer and Fault Permeabilities by Studying the Poroelastic Response of Rocks Using InSAR in the Upper Coachella Valley Area, CA, USA, Eos Trans. AGU, Fall Meet. Suppl., Abstract H42B-08, talk, 2007.

• Randolph, J., M.O. Saar, C. Farrar, and S. Hurwitz, Using Transient Temperature-Depth Data to Constrain Groundwater Flow Velocities in Thermal Aquifers of Long Valley Caldera, California, Eos Trans. AGU, Fall Meet. Suppl., Abstract H33M-06, talk, 2007.

• Walsh*, S.D.C., H. Burwinkle, R. O'Grady, and M.O. Saar, Lattice-Boltzmann Simulations of Heterogeneous Porous Media: A Comparison Between Three Approaches, Eos Trans. AGU, Fall Meet. Suppl., Abstract H33H-1720, poster, 2007.

• Andrews, J.L., and M.O. Saar, Coupled Transport of Magma- and Mantle-Sourced Heat and Helium in Heterogeneous, Fractured Aquifers, Eos Trans. AGU, Fall Meet. Suppl., Abstract H33H-1711, poster, 2007.

• Walsh*, S.D.C, S. Alexander, and M.O. Saar, Lattice-Boltzmann models of speleogenic processes, GSA National Meeting - Denver, Geological Society of America, Abstracts with Programs, 2007.

• Anderson, K.J., and M.O. Saar, Determination of Macroscopic Material Properties Through Analyses of Microstructures in Volcano Conduit Magmas, University of Minnesota Undergraduate Symposium, April 18, 2007.

• Walsh*, S.D.C., and M.O. Saar, Insights Into Magmatic Properties From Multiphase Percolation Theory, Eos Trans. AGU, Fall Meet. Suppl., Abstract V34A-08, 2006.

• Andrews, J.L., M.O. Saar, and S. Finsterle, Heat and Helium Transport: The Effect of Subsurface Processes on Near-Surface Signals, Eos Trans. AGU, Fall Meet. Suppl., Abstract H43A-0477, 2006.

• Davis, M.A., S.D.C. Walsh*, K.J. Anderson, and M.O. Saar, Upscaling Pumice-Sized Bubble Networks to the Volcanic Conduit Scale: Implications for Magma Permeabilities and Volatile Degassing Rates, Eos Trans. AGU, Fall Meet. Suppl., Abstract V43A-1774, 2006.

• Saar, M.O., and J.L. Andrews, Groundwater as a Sampling Tool and Transfer Function for Magmatic Heat and Gases to Constrain Hot Spot Dynamics, Eos Trans. AGU, Fall Meet. Suppl., Abstract V51D-1701, 2006.

• Anderson, K.J., M.O. Saar, and M.A. Davis, Using Pore-Scale Analyses of Composite Materials to Determine Their Macroscopic Properties, Eos Trans. AGU, Fall Meet. Suppl., Abstract H53G-06, 2006.

• Hurwitz, S., C.D. Farrar, J. Randolph, and M.O. Saar, Anomalous Hydrothermal Activity in Hot Creek Gorge Area, Long Valley Caldera, California, USA, Eos Trans. AGU, Fall Meet. Suppl., Abstract V53A-1742, 2006.

• Andrews, J.L., and M.O. Saar, Modeling of helium and heat transport in an extensional basin using the noble gas module EOSN in TOUGH2, submitted to the TOUGH2 Symposium, Lawrence Berkeley National Laboratory, Berkeley, CA, May 15-17, 2006.

• Saar, M.O., Macroscopic bubble network formation in the presence of crystals, AGU National Meeting - San Francisco, Dec. 5-9, 2005.

• Saar, M.O., Helium isotopes as a natural tracer in volcanic and non-volcanic aquifers, MGWA fall conference, Nov. 18, 2005.

• Saar, M.O., Macroscopic porous medium reconstruction from micro-structure analyses, GSA National Meeting - Salt Lake City, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 0, 2005.

• Hirschmann, M.M., D.L. Whitney, and M.O. Saar, Fluids from surface to core: Eight years of the University of Minnesota - Twin Cities' summer REU program, GSA National Meeting - Salt Lake City, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 0, 2005.

• Hurwitz, S., M.O. Saar, L. Mastin, and J. Major, Volcano Hydrology, special session at the AGU Spring meeting in New Orleans, May 23-27, 2005.

• Thorleifson, H., and M.O. Saar, Groundwater sustainability: methods
  for analysis, mapping, monitoring, and management of regional systems,
  symposium at the GSA N-Central meeting in Minneapolis, MN, May 19-20, 2005.
  symposium abstract
  

• Christiansen, L.B., S. Hurwitz, M.O. Saar, and S.E. Ingebritsen, Seasonal Seismicity Associated with Western United States Volcanoes, AGU National Meeting - San Francisco, Dec. 13-17, 2004.

• Saar, M.O., Correcting noble gas data from volcanic terranes, 12th Annual Hubbert Quorum, USGS, Menlo Park, Dec. 12, 2004.

• Saar, M.O., M.C. Castro, C.M. Hall, M. Manga, and T.P. Rose, Mantle Contributions to Groundwater in the Oregon Cascades and Eastern Oregon Inferred from Helium Isotopes, GSA National Meeting - Denver, Vol. 36, Nr. 5, p. 469 (talk 202-6), Nov. 7-10, 2004.
  abstract

• Christiansen, L.B., S. Hurwitz, S.E. Ingebritsen, and M.O. Saar, Annual seismicity and groundwater recharge in the western United States, International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) General Assembly, Pucon, Chile, 2004

• Saar, M.O., and M. Manga, Rheology of magmas and transition in lava flow dynamics inferred from percolation theory, 25th IUGG Conference on Mathematical Geophysics, Columbia University, New York, NY, June 16-18, 2004
  extended pdf-abstract

• Saar, M.O., and M. Manga, Determination of a permeability-depth curve for the Oregon Cascades employing numerical, analytical, and statistical methods Eos Trans. AGU, Vol. 84, No. 46, Fall Meet. Suppl., Abstract H11G-0952, 2003.
  pdf-poster (570 KB)

• Jellinek M., M. Manga, and M.O. Saar, Did melting glaciers cause volcanic eruptions in eastern California? A natural probe of the mechanics of dike formation. Eos Trans. AGU, Vol. 84, No. 46, Fall Meet. Suppl., Abstract V52F-04, 2003.

• Saar, M.O., and M. Manga, Large-scale permeability models for the Cascade Arc, inferred from hydrologic, thermal, and seismic data, GSA Abstract with Programs, 201-4, p. 487, 2003

• Saar, M.O., and M. Manga, Fluid flow and the state of stress at Mt. Hood, Oregon, inferred from microseismicity induced by groundwater recharge, Geophysical Research Abstracts, EGS-AGU-EUG, Vol. 5, 2003

• Saar, M.O., and M. Manga, Seismicity Induced by Groundwater Recharge at Mt. Hood, Oregon, and its Implications for Hydrogeologic Properties, Eos Trans. AGU, Vol. 83, No. 47, p. 349, 2002.
  pdf-poster (1.1 MB)

• Saar, M.O., and M.Manga, The Temperature Distribution Beneath the Oregon Cascades with Implications for Groundwater and Heat Flow, Eos Trans. AGU, Vol. 81 (48), Fall Meet. Suppl., 2000.
  pdf-poster (1.9 MB)

• Saar, M.O., K. Cashman, S. Fremouw, and M. Manga, Network Formation in Crystal-Melt Suspensions at Low Volume Fractions, Geological Society of America Annual Meeting Abstracts with Programs, 2000

• Saar, M.O., K. Cashman, S. Fremouw, M. Burke, B. Rowe, and F. Rusli, Determining Onset of Minimum Yield Strength in Crystal-Melt Suspensions Using a Percolation Theory Approach, Eos Trans. AGU, Vol. 81, p. 421, 2000.

• Saar, M.O., and M. Manga, Relationship between intrinsic permeability, porosity, and microstructure of Holocene basalts in the Oregon Cascades, Oregon Academy of Sciences Annual Meeting, Proceedings, Vol. 35, p.45, 1999.

• Saar, M.O. and M. Manga, Permeability of vesicular basalt, Eos Trans., Vol. 78, p. 241, 1997.