Allen G. Hunt

Professor, Department of Physics
Fawcett Hall 265, 3640 Colonel Glenn Hwy, Dayton, OH 45435-0001

University Professor 2021-2026 (for research outside principal field of physics through 2020)

Outstanding Scholarly Activity Award (2023 for period 2020-2023)

Since 2004 at Wright State, since 2007, Full Professor, Physics and EES/Geology (during period of its existence)

Program Director, Hydrologic Sciences, National Science Foundation 2002-2003

Climate Dynamics, Pacific Northwest National Laboratory 1999-2002

M.A. Geomorphology, 1996, Duke University

Fulbright Scholar, 1985-1987, Germany (Semiconductor Physics)

Ph.D. Physics, 1983, University of California, Riverside

Google Scholar citations 6277, H-index 39, Sigma Xi

News announcement from the American Geophysical Union, July 27, 2023:

"I’m writing to let you know that your research article “Predicting Streamflow Elasticity Based on Percolation Theory and Ecological Optimality”, [Published in the journal AGU Advances] was selected for featuring as an Editor’s Highlight, and this has just been published on We are delighted to highlight your research on Fewer than 2 per cent of papers are selected to be featured in this way."

Total research funding at Wright State, ca. $500,000

Funding sources (most recent first) and project(s), Swiss National Science Foundation (Soil Formation), NSF Geobiology and Low T Geochemistry (Chemical Weathering of Earth Materias), PNNL Geochemistry (Surface Reactions in Porous Media), Procter & Gamble (Optimal Diaper Design), BHP Billiton (Heap Leaching, Compression Effects), NSF Hydrologic Sciences (Solute Transport in Porous Media; Hydraulic Conductivity of Realistic Geologic Media, Non-Equilibrium Effects on Pressure-Saturation Curves), Phelps-Dodge (Air Permeability of Mining Heaps), USDA (Electrical Conductivity of Clay Minerals).


Currrent/Recent Classes: In Physics, Statistical Mechanics and Freshman Engineering Physics, in EES, Watershed Hydrology, Vadose Zone Hydrology, Geomorphology


1997, Latter Day Saints Student Society "Teacher of Distinction" (awarded to less than 0.5% of the faculty), Riverside Community College, Riverside CA

2009, Who's Who Among American Teachers, Wright State University

2021-2026 University Professor (1 of 3)

Research Statement

For a basic understanding of the relationship between my research and soil science, see the invited articles, "What's Wrong with Soil Physics?", or "What Perspective Will Best Lead Soil Physics into the Future? " For the long-term relationship of percolation theory with hydrology, including our efforts to transform the study of hydrology/soil physics, see the Wiki page, "Percolation Concepts in Hydrology." Also, our book in the Lecture Notes in Physics series, "Percolation Theory for Flow in Porous Media," was developed from a class that I taught in my first year at Wright State - its home in the LNP series is appropriate.

My recent research, centered around prediction of the water balance, i.e., what fraction of precipitation goes to plants and what to run-off, as a function of climatic variables (solar irradiance and precipitation), just appeared in GSA Today., Water Resources Research, and in our AGU/Wiley book, "Hydrogeology, Chemical Weathering, and Soil Formation." Solution of this problem is the central goal of NSF's Hydrologic Sciences program as well as a defining focus of NSF Ecology and the Food Energy Water Nexus. The solution grew out of our soils research into water flow, solute transport, chemical weathering, soil formation, and vegetation growth. See the book here  and its description in Eos (Transactions of the American Geophysical Union) This book, an international collaboration, became an AGU "Best Seller."

More recently, comparison with observations of changes of stream-flow with precipitation and potential evapotranspiration across the globe are better predicted with fundamental derivatives of our water balance function than in existing treatments of the water balance, a topic of critical importance for the world's water resources.

For an easy introduction to our group's research, link to University of Texas Dallas (UTD) NEWS VIDEO highlighting Current Research distributed to AAAS, GSA, AGU, Sigma Xi: This video also explains the relationships between recent, current, and proposed future research. The same people also put out this important 2-minute video about the Texas energy disaster, called very important by the Amerian Geophysical Union

Ranked 177th out of the world's civil engineers by a 2020 Stanford study.

#1 in citations in Soil Science Society of America Journal, 2013.

#1 published author in the Lecture Notes in Physics series.

Recent Research:

See Eos (Transactions of American Geophysical Union) Editor's Vox for discussion of our 2017 Reviews of Geophysics article, including its possible implications for the cause of the great Permian Extinction (severest of all geologic extinctions).

Determined the temporal and spatial scaling of variables important to agriculture, soil sciences, and ecology: 1) Infiltration, evapotranspiration, run-off, vegetation growth and productivity, as well as chemical weathering and soil formation. Used a simple optimization of NPP with respect to the water fluxes, evapotranspiration and run-off, to find the relative magnitudes of these principal components of the whater balance (partitioning of water at the terrestrial Earth's surface. Applications of great importance to carbon and water cycling. Apply the research regarding the dependence of vegetation growth rates on transpiration to the prediction of the local variability of intraspecific tree heights due to soil type, microclimate, hillslope curvature, and slope aspect (Ecological Modelling). Apply the predictions regarding soil depth as a function of time to the assessment of slope stability against landsliding (Geochemistry, Geophysics, Geosystems).

Current Research:

Predict the water balance, i.e., how water is partitioned at the terrestrial Earth's surface.

In a new discussion article in the international AGU/EGU journal Nonlinear Processes in Geophysics, we show that the same predictive relationship for plant growth, which gives verifiable root system extent for times up to 100,000 years, works also for river drainage organization out to time scales of 100,000,000 years. One parameter must be changed: for plants the relevant flow rate is the water flow in the unsaturated zone, but for rivers, it is the groundwater flow rate in the saturated zone. This completes our description of the dimensions of the critical zone, between the bedrock and the treetops, in that we can predict its depth and horizontal extent on the time scale since the break-up of Pangaea.

Future Research:

Use past results on soil formation as a function of water infiltration and on predicting infiltration from optimization of net primary productivity to develop fully predictive steady-state model of land surface vegetation and soil development in terms of climatic variables.

Use the above results to predict effects of climate change (disruption to steady-state conditions) on water resources and food production (now current; see above).

Use the resuts on root growth patterns to predict characteristics of invasive species.

Students Advised

Ph.D. Students

Fang Yu (2018). Currently Asst Prof. at Beihua University of Forestry, Jilin City, PR China

Behzad Ghanbarian (2014). Received (2015) Turcotte Award from the American Geophysical Union for his Ph.D. dissertation research (#1 in the world). Received (2020) Early Career Award for Soil Physics and Hydrology from Soil Science Society of America. Currently Assoc. Prof. at Kansas State University

Master's Students

Eric Jackson (Physics)

Bilal Idriss (EES)

L. Aaron Blank (Physics)


Refereed Technical Articles: Physics and Materials Science

  1. Hunt, A. and Pollak, M. 1985, A Theory for the Width of the Coulomb Gap, Journal of Physics: C18, 5325-5334.
  2. Hunt, A. and Pollak, M. 1986, Cohesive Energies in Certain Sequences of Cubic and Square Lattices Philosophical Magazine 53(5), 353-366.
  3. Hunt, A. 1987, Critical Behavior in Electron Glass, Philosophical Magazine 55(4), 523-530.
  4. Hunt, A. 1987, A New Percolation Theory for Many-Electron Excitations at Low Temperatures, Journal of Physics: C20, 1469-1482.
  5. Hunt, A. 1989, The Relationship Between the Conductivity and the Glass Temperature for Hopping Systems, Physical Review B39(BR) 11154
  6. Hunt, A. 1990, Approximate Thermodynamical Treatment of the Coulomb Gap, Philosophical Magazine Letters 62(5), 371-376.
  7. Hunt, A. 1990, An Elementary Treatment of Sequential Correlations in Non-Local Relaxation, Philosophical Magazine Letters 62(6), 399-405.
  8. Hunt, A. 1990, Frequency-Dependent Conductivity in Glasses, Journal of Physics: Condensed Matter 2(46), 9055-9063.
  9. Hunt, A. 1990, Incorporation of Finite Temperature Structure and Statistics into Conductivity Calculations in the Coulomb Gap, Physics Letters A 151(3-4), 187-190.
  10. Hunt, A. 1991, The Frequency-Dependent Conductivity of the Electron Glass, Physics Letters A 156(9), 502-508.
  11. Hunt, A. 1991, One-Dimensional Hopping Conductivity Calculations, Philosophical Magazine 64(3), 327-334; Erratum, Philosophical Magazine 66(6), 843-843 (1992).
  12. Hunt, A. 1991, The Calorimetric Glass Transition: A Simple Model, Philosophical Magazine 64(5), 563-577.
  13. Hunt, A. 1991, The AC Conductivity of Variable-Range Hopping Systems, Such As Amorphous Semiconductors, Philosophical Magazine 64(5), 579-589.
  14. Hunt, A. 1991, Transport in Ionic Conducting Glasses, Journal of Physics: Condensed Matter 3(40), 7831-7842.
  15. Hunt, A. 1991, A Percolation Treatment of the AC Hopping Conductivity at Low Frequencies and Dimensionalities, Journal of Non-Crystalline Solids 134(3), 287-292.
  16. Hunt, A. 1991, The AC Conductivity of the Fermi Glass: A Model for Glassy Conduction, Solid State Communications 80(3), 151-155.
  17. Hunt, A. 1992, Transport in Ionic Conducting Glasses 2: Scaling Relations and Approximate Power-Law Behavior, Journal of Physics: Condensed Matter 4(24), 5371-5381.
  18. Hunt, A. 1992, The Low Frequency Conductivity of the Fermi Glass, Journal of Physics: Condensed Matter, 4(33), 6957-6970.
  19. Hunt, A. 1992, A Method for Distinguishing Power-Law and Approximate Power-Law Behavior in Glassy Relaxation: Ionic Conducting Glasses, Applied Physics A 54(6), 508-510.
  20. Hunt, A. 1992, A Simple Connection Between the Melting Temperature and the Glass Temperature in a Kinetic Theory of the Glass Transition, Journal of Physics: Condensed Matter, Letter to the Editor 4(32), L429-L431.
  21. Hunt, A. 1992, Some Universalities in the Relaxation of Glasses, Journal of Non-Crystalline Solids 144(1), 21-31.
  22. Hunt, A. 1992, A Purely Kinetic Justification for Application of Ehrenfest Theorems to the Glass Transition, Solid State Communications 84(3), 263-266.
  23. Hunt, A. 1992, Dielectric and Mechanical Relaxation in Liquids and Glasses: Transition From Effective Medium to Percolation Theories, Solid State Communications 84(7), 701-704.
  24. Hunt, A. 1992, A Probabilistic Mechanism Hidden Behind the Universal Power Law For Dielectric Relaxation-General Relaxation Equation: Comment, Journal of Physics: Condensed Matter 4(50), 10503-10512.
  25. Hunt, A. 1993, A General Treatment of One-Dimensional Hopping Conduction, Solid State Communications 86(12), 765-768.
  26. Hunt, A. 1993, Dielectric Relaxation in Dipole Glasses, and Thermal Relaxation and the Glass Transition in Systems with a Maximum Relaxation Time, Journal of Non-Crystalline Solids 160(1-2), 42-51.
  27. Hunt, A. 1993, An Explanation for the Correlation Between the Glass Temperature and the Temperature of the Extrapolated Divergence of the Viscosity in Vogel-Fulcher Phenomenology, Solid State Communications 88(5), 377-379.
  28. Hunt, A. 1994, New Developments in the Theory of the Electrical Conductivity of Spatially Random Electronic Hopping Systems, Journal of Physics: Condensed Matter 6(6), 1239.
  29. Hunt, A. 1994, An Explanation for the Correlation Between the Decoupling Index and the K-W-W Stretching Parameter, Journal of Non-Crystalline Solids 168(3), 258.
  30. Hunt, A. 1994, Finite-Size Effects on the Glass Transition Temperature, Solid State Communications 90(8), 527.
  31. Hunt, A. 1994, Statistical and Percolation Effects on Ionic Conduction in Amorphous Systems, Journal of Non-Crystalline Solids 175(1), 59-70.
  32. Hunt, A. 1994, On the “Universal" Scaling of the Dielectric Relaxation in Dipole Glasses, Journal of Physics: Condensed Matter 6(39), 8087-8102.
  33. Hunt, A. 1994, An Explanation for the Kauzmann “Paradox" and its Relation to Relaxation Times, Journal of Non-Crystalline Solids 175(2), 129-136.
  34. Hunt, A. 1994, The Pressure Dependence of the Glass Transition Temperature in Some Ionic Liquids, Journal of Non-Crystalline Solids 176(2), 288.
  35. Hunt, A. 1995, Approximate Power-Law Conductivity in the Multiple-Hopping Regime Journal of Non-Crystalline Solids 183(1-2), 109.
  36. Hunt, A. 1995, Correlation functions for ionic motion from NMR relaxation and electrical conductivity in the glassy fast-ion conductor (Li2S)0.56(SiS2)0.44: Comment, Physical Review B51(17), 12000.
  37. Hunt, A. 1995. Deducing low-frequency scaling of transport properties in an inhomogeneous medium from thermodynamics and geometry Philosophical Magazine B72(4), 401-415.
  38. Hunt, A. 1996, Some comments on the dynamics of super-cooled liquids near the glass transition, Journal of Non-Crystalline Solids 195(3), 293-303.
  39. Hunt, A., 1997, The mixed-alkali effect discussed within the context of percolative transport, Journal of Non-Crystalline Solids 195(3), 293-303.
  40. Hunt, A. G., 1998, A new calculation of 1/f noise in disordered systems with hopping transport, Journal of Physics: Condensed Matter Letter to the Editor, 10(18), L303-L310.
  41. Hunt, A. G., 2009, Relevance of percolation theory to power-law behavior of dynamic processes including transport in disordered media, Complexity 15: 13-27.

Refereed Technical Articles: Geomorphology/Geophysics

  1. Hunt, A. G. and Malin, P. E., 1998, Possible Triggering of Heinrich Events by Ice-Load Induced Earthquakes, Nature 393(6681), 156-158 (Subject of Geotimes news story).
  2. Hunt, A. G., and Wu, Q. J., 2004 Climatic Influences on Holocene variations in soil erosion rates on a small hill in the Mojave Desert, Geomorphology, 58: 263-289.
  3. Hunt, A. G., and Elders W. 2004, Climate change, and the evolution of the Grand Canyon and Colorado River Delta, The Colorado River: Origin and Evolution, Grand Canyon Association Monograph no. 12, ed. R. A. Young and E. E. Spamer, 191-194.
  4. Hunt, A. G., 2005, Comment on “Modeling low-frequency magnetic-field precursors to the Loma Prieta Earthquake with a precursory increase in fault-zone conductivity,” by M. Merzer and S. L. Klemperer, Pure and Applied Geophysics,  DOI: 10.1007/s00024-005-2776-6.
  5. Hunt, A., N. Gershenzon, and G. Bambakidis, 2007. Pre-seismic electromagnetic phenomena in the framework of percolation and fractal theories. Tectonophysics, 431(1-4), 23-32.
  6. Hunt, A. G., 2016, Possible explanation of the values of Hack’s drainage basin, river length scaling exponent, Non-linear Processes in Geophysics, 23; 91-93.
  7. Yu, F., B. Faybishenko, A. G. Hunt, and B. Ghanbarian, 2017, A simple model of the variability of topsoil depths (Invited, Featured) Water 9 (7) 460 doi:10.3390/w9070460 .
  8. Yu, F., and A. G. Hunt, 2017, An examination of the steady-state assumption in certain soil production models with application to landscape evolution, Earth Surface Processes and Landforms. DOI: 10.1002/esp.4209.
  9. Yu., F. and A. G. Hunt, 2017, Predicting soil formation on the basis of transport-limited chemical weathering, Geomorphology,
  10. Yu, F., A. G. Hunt, M. Egli, and G. Raab, 2019, Comparison and contrast in soil depth evolution for steady-state and stochastic erosion processes: Possible implications for landslide prediction, Geochemistry, Geophysics, Geosystems,
  11. Hunt, Allen G., Behzad Ghanbarian, and Boris Faybishenko. "A model of temporal and spatial river network evolution with climatic inputs." Frontiers in Water 5 (2023): 1174570.

Refereed Technical Articles: Hydrology/Soil Physics

  1. Kabala, Z.J., and Hunt, A. 1993, A master equation for reactive solute transport, Stochastic Hydrology and Hydraulics 7(4), 255-268.
  2. Hunt, A. 1995 Fractal and superdiffusive transport and hydrodynamic dispersion in heterogeneous porous media: comment (Review) Transport in Porous Media 21(2), 175-188.
  3. Hunt, A. G., 1998, Upscaling in subsurface transport using cluster statistics of percolation, Transport in Porous Media 30(2), 177-198.
  4. Hunt, A. G., 1999, A probabilistic treatment of fluvial entrainment of cohesionless particles, Journal of Geophysical Research.104 15409-15413.
  5. Hunt, A. G., 2000, Percolation cluster statistics and conductivity semi-variograms, Transport in Porous Media, 39 131-141.
  6. Hunt, A. G., 2001, Applications of percolation theory to porous media with distributed local conductances, Advances in Water Resources, 24: 279-307.
  7. Hunt, A. G., and Gee, G. W., 2002, Application of critical path analysis to fractal porous media: Comparison with examples from the Hanford site, Advances in Water Resources, 25, 129-146.
  8. Hunt, A. G., and Gee, G. W., 2002, Water retention of fractal soil models using continuum percolation theory: Tests of Hanford site soils, Vadose Zone Journal, 1, 252-260.
  9. Hunt, A. G., 2003, Some comments on the scale dependence of the hydraulic conductivity in the presence of nested heterogeneity, Advances in Water Resources, 26, 71-77.
  10. Hunt, A. G., and Manga, M., 2003, Effects of bubbles on the hydraulic conductivity of porous materials – Theoretical results, Transport in Porous Media, 52, 51-65, 2003.
  11. Hunt, A. G., and Ewing, R. P., 2003, On the vanishing of solute diffusion in porous media at a threshold moisture content, Soil Science Society of America Journal, 67, 1701-1702, 2003.
  12. Hunt, A. G., and Papanicolaou, T., 2003, Tests of predicted downstream transport of clasts in turbulent flow, Advances in Water Resources, 26, 1205-1211, 2003.
  13. Hunt, A. G., and Gee, G. W., 2003, Wet-end deviations from scaling of the water retention characteristics of fractal porous media, Vadose Zone Journal, 2, 759-765.
  14. Hunt, A. G., 2004, An explicit derivation of an exponential dependence of the hydraulic conductivity on saturation, Advances in Water Resources, 27, 197-201.
  15. Hunt, A. G., 2004, Percolative transport and fractal porous media, Chaos, Solitons, and Fractals, 19, 309-325.
  16. Hunt, A. G., 2004, Continuum percolation theory for water retention and hydraulic conductivity of fractal soils: 1. Estimation of the critical volume fraction for percolation, Advances in Water Resources, 27, 175-183.
  17. Hunt, A. G., 2004, Continuum percolation theory for water retention and hydraulic conductivity of fractal soils: 2. Extension to non-equilibrium, Advances in Water Resources, 27, 245-257.
  18. Hunt, A. G., 2004, Comparing van Genuchten and percolation theoretical formulations of the hydraulic properties of unsaturated media, Vadose Zone Journal, 3: 1483-1488.
  19. Hunt, A. G., 2004, Continuum Percolation Theory and Archie’s Law, 2004, Geophysical Research Letters, 31 (19): art. no. L19503.
  20. Steenhuis, T., Hunt, A. G., Parlange, J.-Y., and Ewing, R. P., 2005, Assessment of the application of percolation theory to water-repellent soils, Australian Journal of Soil Research, 43: 357-360.
  21. Hunt, A. G., 2005, Percolation theory and the future of hydrogeology (invited), Hydrogeology Journal, 13: 202-205.
  22. Hunt, A. G., 2005, Continuum percolation theory for saturation dependence of air permeability, Vadose Zone Journal, 4: 134-138.
  23. Hunt, A. G., and Skinner, T. E., 2005, Hydraulic conductivity limited equilibration: effect on water-retention characteristics, Vadose Zone Journal, 4: 145-150 (Subject of CSA News story).
  24. Hunt, A. G., 2005, Scale-dependent dimensionality cross-over; implications for scale-dependent hydraulic conductivity in anisotropic porous media, Hydrogeology Journal, DOI: 10.1007/s10040-005-0453-6
  25. Hunt, A. G., G. E. Grant, and V. K. Gupta, 2006, Spatio-temporal scaling of braided streams, Journal of Hydrology, doi:10.1016/j.jhydrol.2005.02.034 
  26. Hunt, A. G., 2005, Continuum percolation theory for transport properties in porous media, Philosophical Magazine, 85: 3409-3434.
  27. Ewing, R., and Hunt, A., 2006, Dependence of the electrical conductivity on saturation in real porous media. Vadose Zone Journal,  5(2), 731-741.
  28. Hunt, A. G., 2006, Comment on "Fractal approach to hydraulic properties in unsaturated porous media," by Y.F. Xu and Ping Dong, Chaos, Solitons, and Fractals, 19 327-337 (2004), Chaos, Solitons, and Fractals, 28, 278-281.
  29. Hunt, A. G., L. A. Blank, and T. E. Skinner, 2006, Distributions of the hydraulic conductivity for single-scale anisotropy, Phil. Mag., 86: 2407-2428.
  30. Hunt, A., 2007, Comments on “Fractal fragmentation, soil porosity, and soil water properties: I. Theory”, Soil Science Society of America Journal, 71(4), 1418-1419.
  31. Blank, L., Hunt, A., and Skinner, T. 2008. A numerical procedure to calculate hydraulic conductivity for an arbitrary pore size distribution. Vadose Zone Journal, 7(2), 461-472.
  32. Hunt, A. G., and T. E. Skinner, 2008, Longitudinal dispersion in porous media solely by advection, Phil. Mag., 88: 2921-2944.
  33. Hunt, A. G., and T. E. Skinner, 2009, A proposed analysis of saturation-dependent anisotropy for U.S. DOE Hanford site soils, Hydrogeology Journal DOI 10.1007/s10040-009-0499-y.
  34. Hunt, A., and B. Idriss, 2009, Percolation-based effective conductivity calculations for bimodal distributions of local conductances. Philosophical Magazine, 89(22-24), 1989-2007.
  35. Hunt, A. G. and T. E. Skinner, 2010, Incorporation of effects of diffusion into advection-mediated dispersion in porous media, J. Stat. Phys., 140: 544-564.
  36. Hunt, A. G., and T. E.  Skinner, 2010, Predicting Dispersion in Porous Media. Complexity, 16(1), 43-55. doi:10.1002/cplx.20322 (Cover article).
  37. Hunt, A. G., T. E. Skinner, R. P. Ewing, and B. Ghanbarian-Alavijeh, 2011, Dispersion of solutes in porous media. European Physical Journal B, 80(4), 411-432. doi:10.1140/epjb/e2011-10805-y (invited, featured, colloquium paper).
  38. Ghanbarian-Alavijeh, B., A. G. Hunt, and T. E. Skinner, 2012, The saturation dependence of solute dispersion in porous media, Phys. Rev. E. 86(6) Article Number: 066316   DOI: 10.1103/PhysRevE.86.066316.
  39. Ghanbarian-Alavijeh, B., and A. G. Hunt, 2012, Estimation of Soil-Water Retention From Particle-Size Distribution: Fractal Approaches, Soil Science, 177: 321-326.
  40. Ghanbarian-Alavijeh, B., and A. G. Hunt, 2012, Unsaturated hydraulic conductivity in porous media: Percolation theory, Geoderma, 187: 77-84.
  41. Ghanbarian-Alavijeh, B., and A. G. Hunt, 2012, Comparison of the predictions of universal scaling of the saturation dependence of the air permeability with experiment, Water Resources Research, 48(8) doi:10.1029/2011WR011758
  42. Ghanbarian-Alavijeh, B. and A. G. Hunt, 2012, Comments on "More general capillary pressure and relative permeability models from fractal geometry" by Kewen Li," Journal of Contaminant Hydrology, 140, 21-23. doi:10.1016/j.jconhyd.2012.08.004.
  43. Hunt, A. G., R. P. Ewing, and R. Horton, 2013, What’s wrong with soil physics? Invited Comment, Soil Science Society of America Journal.77(6) 1877-1887 (Subject of CSA News story).
  44. Ghanbarian-Alavijeh, B., A. G. Hunt, M. Sahimi, R. P. Ewing, and T. E. Skinner, 2013, Percolation theory generates a physically based description of tortuosity in saturated and unsaturated porous media, Soil Science Society of America Journal, 77(6): 1920-1929.
  45. Ghanbarian-Alavijeh, B., and A. G. Hunt, 2013, Unsaturated hydraulic conductivity modeling for porous media with two fractal regimes, Geoderma, 207:268-278.
  46. Ghanbarian-Alavijeh, B. and A. G. Hunt, 2014, Saturation dependence of solute diffusion in porous media: universal scaling compared with experiments, Vadose Zone Journal, 13(4): 1920-1929.
  47. Ghanbarian-Alavijeh, B., and A. G. Hunt, 2014, Universal scaling of gas diffusion in porous media, Water Resources Research, 50:: 2242-2256.
  48. Ghanbarian-Alavijeh, B., A. G. Hunt, T. E. Skinner, and R. P. Ewing, 2014, Universal scaling of the formation factor in porous media derived by combining percolation and effective-medium theories, Geophysical Research Letters 41(11): 3884-3890.
  49. Ghanbarian-Alavijeh, B., and A. G. Hunt, 2014, Relationship between saturated hydraulic conductivity and air permeability under dry conditions, Vadose Zone Journal, 13 (8) doi:10.2136vzj2014.03.0029.
  50. Ghanbarian-Alavijeh, B., A. G. Hunt, R. E. Ewing, and T. E. Skinner, 2014, Invited, Saturation dependence of transport in porous media predicted by percolation and effective medium theories, Fractals. DOI: 10.1142/S0218348X15400046 (Highlighted by journal as among its best papers of the year)       Saturation Dependence of Transport in Porous Media Predicted by Percolation and Effective Medium Theories 
  51. Ghanbarian, B., R. P. Ewing, A. G. Hunt, and M. Sahimi, 2015, Gas and Solute Diffusion in Partially Saturated Porous Media: Percolation Theory and Effective-Medium    Approximation Compared with Lattice-Boltzmann Simulations, J. of Geophys. Res.: Solid Earth, 120: 183-190.
  52. Ewing, R. P., B. Ghanbarian, and A. G. Hunt, 2015, Gradients and assumptions affect interpretation of laboratory measured gas phase transport, Soil Sci. Soc. Am. J., Soil 79 (4), 1018-1029.
  53. Ghanbarian, B, A. G. Hunt, and H. Daigle, 2016, Fluid flow in porous media with rough pore-solid interface, Water Resources Research. DOI: 10.1002/2015WR017857.
  54. Hunt, A. G., and B. Ghanbarian, 2016, Percolation theory for solute transport in porous media: Geochemistry, geomorphology, and carbon cycling, Water Resources Research, 52: 7444-7459 - special issue concerning AGU Chapman Conference on MADE Challenge (Highlighted by NSF and AGU on social media).
  55. Hunt, A. G., B. Ghanbarian and R. Holtzman, 2017, Upscaling soil infiltration and evapotranspiration from percolation theory, Water  9: 104. (Invited, Featured).
  56. Ghanbarian, B., A. G. Hunt, T. H. Skaggs, and N. Jarvis, 2017, Upscaling soil saturated hydraulic conductivity from pore throat characteristics, Advances in Water Resources.
  57. Ghanbarian, B., A. G. Hunt, 2017, Improving unsaturated hydraulic conductivity estimations in soils via percolation theory, Geoderma, 303: 9-18.
  58. Ghanbarian, B., M. Ioannidis, and A. G. Hunt, 2017, Theoretical insight into the empirical tortuosity-connectivity factor in the Burdine-Brooks-Corey water relative permeability model, Water Resources Research, 53.
  59. Ghanbarian, B., H. Ebrahimian, A. G. Hunt, and M. Th. van Genuchten, 2018, Theoretical bounds for the exponent in the empirical power-law advance-time curve for surface flow, Agricultural Water Management 210: 208-216.
  60. Hunt, A. G., Faybishenko, B. A., Ghanbarian, B., Egli, M., and Yu, F., 2019, Predicting water cycle characteristics from percolation theory and observational data, International Journal of Environmental Research and Public Health, 17: 734 10.3390/ijerph17030734. Featured.
  61. Hunt, A. G., B. A. Faybishenko, and B. Ghanbarian, 2020, Predicting the water balance from optimization of plant productivity, GSA Today, 30(9): 28-29.
  62. Ghanbarian, B., A. G. Hunt, M. Bittelli, M. Tuller, and E. Arthur, 2021. Estimating specific surface area: incorporating effects of surface roughness and probing molecule size, Soil Science Society of America Journal, 85: 534-545
  63. Hunt, A G., B. A. Faybishenko, and B. Ghanbarian, 2021, Non-linear hydrologic organization, Non-linear Processes in Geophysics, 28: 599-614.
  64. Hunt, A. G., B. A. Faybishenko, and B. Ghanbarian, 2021, Predicting characteristics of the water cycle from scaling relationships, Water Resources Research, 57, e2021WR030808.
  65. Hunt, A. G., 2022, What perspective will best lead soil physics into the future?. Journal of the Japanese Society of Soil Physics, 152, 3-6.
  66. Hunt, A. G., Sahimi, M. and Ghanbarian, B., 2023. Predicting streamflow elasticity based on percolation theory and ecological optimality, AGU Advances: 4(4) e2022AV000867.

Refereed Technical Articles: Geochemistry

  1. Hunt, A. G., S. Logsdon, and D. Laird, 2005, Percolation treatment of charge transfer in humidified smectite clays, Soil Science Society of America Journal 70: 14-23.
  2. Hunt, A. G., B. Ghanbarian-Alavijeh, T. E. Skinner, and R. P. Ewing, 2014, Scaling of geochemical reaction rates via advective solute transport, Invited, Chaos, DOI: 10.1063/1.4913257DOI: 10.163/1.4913257.
  3. Hunt, A. G., 2015, Predicting rates of weathering rind formation, Vadose Zone Journal,     10.2136/vzj2014.09.01230.2136/vzj2014.09.0123 (Subject of CSA News story).
  4. Hunt, A. G., 2015, Soil depth and soil production, Complexity, DOI: 10.1002/cplx.21664.
  5. Yu, F. and A. G. Hunt, 2017, Damköhler number input to transport-limited chemical weathering and soil production calculations, Earth and Space Chemistry. DOI: 10.1021/acsearthspacechem.6b00007.
  6. Egli,M., A. G. Hunt,  D. Dahms, G. Raab, C. Derungs, S. Raimondi, F Yu, 2018, Prediction of soil formation as a function of age using the percolation theory approach, invited by Frontiers in Environmental Sciences, 28: 
  7. Musso, A., Lamorski, K., Sławiński, C., Seibert, J., Geitner, C., Hunt, A., Greinwald, K., and Egli, M., 2019, Evolution of soil pores and their characteristics in a siliceous and calcareous proglacial area, Catena, 182,

Refereed Technical Articles: Climate

  1. Hunt, A. G., 1999, Understanding a possible correlation between El Niño occurrence frequency and global warming, Bulletin of the American Meteorological Society 80(2) 297-300
  2. Hunt, A. G., 2000, A stochastic atmospheric trigger for El Niño: Implications for East Pacific Rise seismicity, Eos, 81 272.
  3. Hunt, A. G. and A. A. Tsonis, 2000, The Pacific Decadal Oscillation and long-term climate prediction, Eos, 81 581.
  4. Ghan, S. J., X. Bian, A. G. Hunt, and A. Coleman, 2002, The thermodynamic influence of subgrid orography in a global climate model, Climate Dynamics, 20: 31-44.
  5. Leung, L. R., Y. Qian, X.  Bian, and A. G. Hunt, 2002, Hydroclimate of the western United States based on observations and regional climate simulation of 1981-2000. Part II: Interannual variability, Journal of Climate, 16, 1912-1928.
  6. Tsonis, A. A., and A. G. Hunt, 2003, The Role of ENSO in Global Climate Fluctuations, Meteorology and Atmospheric Physics, 84, 229-242.
  7. Tsonis, A. A., J. B. Elsner, A. G. Hunt, T. H. Jagger, 2005, Global temperature fluctuations regulate ENSO Frequency, Geophysical Research Letters, 32, L09701 10.1029/2005GL022875.

Refereed Technical Articles: Biological Sciences/Ecology

  1. Hunt, A. 2008. A new conceptual model for forest fires based on percolation theory. Complexity, 13(3), 12-17 (Cover article).
  2. Hunt, A. G., 2014, Exponential growth in Ebola outbreak since May 14, 2014, Complexity, DOI: 10.1002/cplx.21615.
  3. Hunt, A. G., 2016, Spatio-temporal scaling of vegetation growth and soil formation from percolation theory, Vadose Zone Journal, 15(2): 1-15 doi:10.2136/vzj2015.01.0013 (Subject of CSA News story).
  4. Hunt, A. G., 2017, Spatio-temporal scaling of vegetation growth and soil formation: Explicit predictions, Vadose Zone Journal doi:10.2136/vzj2016.06.0055 (Subject of CSA News Story).
  5. Hunt, A. G., B. A. Faybishenko, and T. L. Powell, 2020, A new phenomenological model to describe root-soil interactions based on percolation theory, Ecological Modelling 433: 109205.
  6. Hunt, A.G. & Faybishenko, B. & Powell, T.L., 2022. Test of model of equivalence of tree height growth and transpiration rates in percolation-based phenomenology for root soil interaction, Ecological Modelling.vol. 465(C), DOI: 10.1016/j.ecolmodel.2021.109853
  7. Hunt, A. G., Sahimi, M., Faybishenko, B. A., Egli, M., Ghanbarian, B., & Yu, F. (2023). Interpreting water demands of forests and grasslands within a new Budyko formulation of evapotranspiration using percolation theory. Science of The Total Environment, 877, 162905.
  8. Hunt, A. G., Sahimi, M., and Ghanbarian, B., 2024. Predicting ecosystem net primary productivity by percolation theory and optimality principle, Water Resources Research, 60(3) doi:10.1029/2023WR036340

Review Articles (Refereed, unless noted)

  2. Hunt, A. 1993, Non-Debye relaxation and the glass transition, Journal of Non-Crystalline Solids 160(3), R183-227.
  3. Hunt, A. G., 2001, AC hopping conduction: Perspective from percolation theory, Philosophical Magazine, B, 81 875-913.
  4. Hunt, A. G., 2001, El Niño: Dynamics, its role in climate change, and its effects on climate variability, Complexity, 6, 16-32.
  5. Hunt, A. G., J. S. Huisman, and H. Vereecken, 2012, On the origin of slow processes of charge transport in porous media, Phil. Mag. 92(36) 4628-4648.
  6. Ghanbarian-Alavijeh, B., A. G. Hunt, R. P. Ewing, M. Sahimi, 2012, Tortuosity in porous media: A critical review, Invited Review Article, Soil Science Society of America Journal. 77(5): 1461-1477.
  7. Hunt, A. G., and M. Sahimi, 2017, Flow, transport, and reaction in porous media: Percolation scaling, critical path analysis and effective-medium approximation, Rev. Geoph. doi: 10.1002/2017RG000558.
  8. Hunt, A. G., and M. Sahimi, 2017, The Spaces in Between, Editor’s Vox, Eos (not reviewed).
  9. Hunt, A. G., M. Egli, and B. A. Faybishenko, 2021, Exploring the Engine and Drivers of Soil Formation, Editor’s Vox, Eos (not reviewed)

Invited Essays

Hunt, A. G., and Z. J. Kabala, 2022, The critical zone at the edge of chaos, To be submitted to Earth.

Refereed Technical Articles: In Preparation

Hunt, A. G., 2024. Percolation and its (Non-)intersection with Hydrology, invited. To be submitted to Hydrology and Earth System Science by March 31 (History of Hydrology special issue, Keith Beven, editor).

Refereed Technical Articles: Submitted


Hunt, A. G., Sahimi, M., Ghanbarian, B., and Poveda, G., From Evapotranspiration through Net Primary Productivity to Prediction of Plant Species Richness, submitted to Water Resources Research.

Hunt, A. G., M. Sahimi, B. A. Faybishenko, M. Egli, Z. J. Kabala, B. Ghanbarian, and F. Yu, Gaia: Complex systems prediction for time to adapt to climate shocks,  Earth System Dynamics.



Invited Contributions (Not Peer-Reviewed Unless Noted)


  1. Pollak, M. and Hunt, A., 1985, Very Slow Relaxation in Systems Lacking Translational Symmetry, with Emphasis on Disordered Insulators, Philosophical Magazine B52, 391 (in honor of Sir Neville Mott).
  2. Hunt, A., 1994, Percolative Aspects of Viscous Flow Near the Glass Transition (reviewed), International Journal of Theoretical Physics, B8(7), 855.


Books and Book Chapters (Not Peer-Reviewed Unless Noted)


  1. Hunt, A. G., Egli, M., and Faybishenko, B. A., Eds., 2021, Hydrogeology, Chemical Weathering and Soil Formation, AGU/Wiley, AGU Geophysical Monographs, AGU Centennial Celebration.
  2. Hunt, A. G., Egli, M., and Faybishenko, B. A., 2021, Summary, Challenges, and Ways Forward, In: Hydrogeology, Chemical Weathering, and Soil Formation.
  3. Hunt, A. G., 2021, Soil Formation, Vegetation Growth, and Water Balance: A Theory for Budyko, In Hydrogeology, Chemical Weathering, and Soil Formation.
  4. Sahimi, M., and Hunt, A. G., 2021, Complex Media and Percolation, Springer.
  5. Hunt, A. G., 2019, Percolation to Geochemistry, In: Complex Media and Percolation.
  6. Hunt, A. G., 2021 (due date), The Physics of Soil Networks, Oxford University Press, approved.
  7. Ghanbarian, B., and A. G. Hunt, Eds. 2017, Fractals: Concepts and Applications in the Geosciences, CRC Press.
  8. Hunt, A. G., and F. Yu, 2017, The fractals of percolation theory in the geosciences, In: Fractals: Concepts and Applications in the Geosciences (above).
  9. Hunt, A. G., 2017, Use of constructal theory in modeling in the geosciences, In: Fractals: Concepts and Applications in the Geosciences (above).
  10. Hunt, A. G. T.E. Skinner, R. P. Ewing, and B. Ghanbarian-Alavijeh, 2017, Percolation in geochemistry, Invited, Encyclopedia of Complexity and Systems Science (2nd edition), Springer.


  1. Hunt, A. G., and S. Manzoni, 2016, Networks on Networks: The Physics of Geobiology and Geochemistry, Institute of Physics, invited e-book Concise Physics . ISBN 978-1-6817-4159-8 (Highlighted by NSF on social media). 2nd edition requested.


  1. Hunt, A. G, and R. P. Ewing, 2016, Scaling, Invited, In: Handbook of Groundwater Engineering, 3rd edition, eds. J. H. Cushman and D. Tartakovsky, Taylor & Francis.


  1. Hunt, A., R. Ewing, and B. Ghanbarian-Alavijeh, 2013, Percolation Theory for Flow in Porous Media (3rd edition), Lecture Notes in Physics 880, Springer, Berlin. 4th edition requested.
  2. Hunt, A. and R. Ewing, 2009, Percolation Theory for Flow in Porous Media (2nd ed.), Lecture Notes in Physics 771, Springer, Berlin.
  3. Hunt, A., 2005, Percolation Theory for Flow in Porous Media, Lecture Notes in Physics 674, Springer, Berlin.


Conference Proceedings and Festschrifts


  1. Hunt, A. and Pollak, M. 1983, An Analytical Calculation of the Density of States in the Coulomb Gap (reviewed), Journal of Non-Crystalline Solids, 59-60, 93.
  2. Pollak, M. and Hunt, A., 1985, Ultra-Slow Processes in Disordered Insulators (reviewed), Journal of Non-Crystalline Solids, 97-98, 131.
  3. Hunt, A. and Pollak, M., 1990, The Frequency-Dependent Conductivity of Spatially Random Systems, in Hopping and Related Phenomena, (not reviewed) edited by M. Pollak and H. Fritzsche, World Scientific, Singapore.
  4. Hunt, A., 1994, Percolation, Self-Similarity, Power-Law Conductivity, Scaling Relationships and 1D Hopping Conductivity, (reviewed) Hopping and Related Phenomena 5, edited by C. J. Adkins, A. R. Long, and J. A. McInnes, World Scientific, Singapore.
  5. Hunt, A. G., 1999, Dependence of the Hydraulic Conductivity on Space and Time Scales, 1997 USDA Salinity Laboratory Workshop on Measuring Hydraulic Conductivity in the Vadose Zone, (not reviewed) R. van Genuchten, F. Leij, and L. Wu, eds.
  6. Hunt, A. G., 1999, Paleobotanical Evidence for the Important Role of the Gulf of California in the Southwestern Monsoon, 24th Annual NOAA Workshop on Climate Diganostics and Prediction, (not reviewed) 96-98.
  7. Hunt, A. G., 1999, A Physical Interpretation of the Correlation Between El Niño and Global Warming, 24th Annual NOAA Workshop on Climate Diagnostics and Prediction, (not reviewed) 33-36.
  8. Hunt, A. G., 2000, Mixed-Alkali Effect: Some New Results, (reviewed): Journal of Non-Crystalline Solids 255, 47-55.
  9. Hunt, A. G., 2000, Fragility of Liquids Using Percolation-Based Transport Theories: Correlation of Limiting Slope of the Viscosity with Non-exponentiality of Relaxation, Journal of Non-Crystalline Solids, 274, (reviewed) 93-101.
  10. Hunt, A. G., 2000, Possible Role for the PDO as an Enhancer of the Solar Signal, 25th Annual NOAA Workshop on Climate Diagnostics and Prediction,  (not reviewed) 31-34.
  11. Hunt, A. G., 2001, Michael Pollak and Transport in Disordered Systems, Phil. Mag. B 81 813-817.
  12. Hunt, A. G., 2002, Slow Conductivity Relaxation in the Fermi Glass (reviewed), IX Int. Conf. on Hopping and Related Phenomena, Phys. Status. Sol. B 230 55-59.
  13. Faybishenko, B., S. Hubbard, E. Brodie, P. Nico, F. Molz, A. G. Hunt, and Y. Pachepsky, 2016, Preface to the special issue of Vadose Zone Journal on Soils as Complex Systems, Vadose Zone Journal 15: doi:10.2136/vzj2016.01.000.


Reviewed Abstracts


  1. Hunt, A., 1984, Coulomb Gap in Disordered Insulators, Solid State Electronics 28,



       1. Castro-Neto, A., Geballe, T. H., and Hunt, A. G, 2019, Michael Pollak, Physics Today, 72: 66-66.


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