Ph.D. - Geophysics, 1995, University of Colorado, Boulder
Dissertation: Modeling Space-Time Rainfall at the Mesoscale Using Random Cascades
M.S. - Civil Engineering, 1984, Stanford University
B.S. - Civil Engineering, 1980, Massachusetts Institute of Technology 

At Eastern since 2000

Assistant Research Professor, Hydrology and Climatology, Department of Geology/Geography

Thomas Over
Department of Geology/Geography
600 Lincoln Ave.
Eastern Illinois University
Charleston, IL  61920-3099

Telephone:    217-581-2110
Facsimile:      217-581-6613
Email:            tmover@eiu.edu

• Stochastic hydrology
• Scaling and fractals in geosciences
• Wind erosion
• Plant-water relations
• Global climate change and hydrology

Enhancement of wind erosion by fire-induced water repellency.
        Sponsor: National Science Foundation, 2008-2010.

The effect of atmospheric humidity on the susceptibility of dry soils to wind erosion.
        Sponsor: National Science Foundation, 2004-2006.
        Presentation of results given at the Bouyoucos Conference on the Origin of Water Repellency in Soils, April 2007.

Advances in Stochastic Wind Modeling for Wind Erosion Estimation
        Sponsor: USDA, Dec. 2001-Dec. 2004.
        Presentation of results given at the European Geosciences Union Meeting in Vienna, Austria, April 2005.

The three projects above are/were joint with Paolo D'Odorico, Department of Environmental Sciences, University of Virginia. The first two projects are/were also joint with Ted M. Zobeck, Wind Erosion and Water Conservation Research Unit, Cropping Systems Research Laboratory, USDA Agricultural Research Service, Lubbock, Texas.

Impact of Geological and Meteorological Factors on the Disjunct Distribution of Lesquerella ludoviciana in Illinois.
This project is being carried out jointly with Vince Gutowski, Department of Geology / Geography, Eastern Illinois University, and Janice Coons and Henry Owen, Department of Biological Science, Eastern Illinois University. Funding has been provided by the Illinois Department of Natural Resources (Wildlife Preservation Fund) and an EIU College of Science Seed Grant.

• Gebremichael, M., Rigon, R., Bertoldi, R., and T. M. OVER, "On the scaling characteristics of observed and simulated spatial soil moisture fields", Nonlin. Processes Geophys., 16, 141-150, 2009.

• Ravi, S. P. D’Odorico, T.M. Zobeck, and T.M. OVER, "The effect of fire-induced soil hydrophobicity on wind erosion in a semiarid grassland: Experimental observations and theoretical framework", Geomorphology, 105: 80-86, 2009.

• Gebremichael, M., W.F. Krajewski, T.M. OVER, Y.N. Takayabu, P. Arkin, and M. Katayama, "Scaling of tropical rainfall as observed by TRMM Precipitation Radar", Atmospheric Research, 88 (3-4): 337-354, 2008.

• Alfieri, L., P. Claps, P. D’Odorico, F. Laio, and T.M. OVER, "An analysis of the soil moisture feedback on convective and stratiform precipitation", J. Hydrometeorol., 9(2): 280-291, 2008.

• Ravi, S., P. D’Odorico, T.M. Zobeck, T.M. OVER, and S.L. Collins, "Feedbacks between fires and wind erosion in heterogeneous arid lands", J. Geophys Res., 112, G04007, doi:10.1029/2007JG000474, 2007.

• Ravi, S. P. D'Odorico, B.E. Herbert, T. M. Zobeck, and T.M. OVER, "Enhancement of wind erosion by fire-induced water repellency", Water Resour. Res., 42, W11422, doi:10.1029/2006WR004895, 2006.

• Gebremichael, M., T.M. OVER, and W.F. Krajewski, "Comparison of the scaling characteristics of rainfall derived from space-based and ground-based radar observations", J. Hydrometeorology, 7: 1277-1294, 2006.

• Ravi, S., T. M. Zobeck, T. M. OVER, G. S. Okin, and P. D'Odorico, "On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion", Sedimentology, 53: 597-609, 2006.

• Rigon, R. G. Bertoldi, and T. M. OVER, "GEOtop: A distributed hydrological model with coupled water and energy budgets", J. Hydrometeorology, 7: 371-388, 2006.

• Bertoldi, G., R. Rigon, and T. M. OVER, "Impact of watershed geomorphic characteristics on the energy and water budgets", J. Hydrometeorology, 7: 389-404, 2006.

• S.-W. Lee, A. G. Klein, and T. M. Over, "A comparison of MODIS and NOHRSC snowcover products for simulating streamflow using the Snowmelt Runoff Model", Hydrol. Proc., 19: 2951-2972, 2005. http://www3.interscience.wiley.com/cgi-bin/jhome/4125

• H. Wang, C.-M.Wang, J.-H. Wang, D.-Y. Qin, Z.-H. Zhou, and T.M. Over, "Theory and practice of runoff space-time distribution", Sci. China Ser. E-Eng. Mater. Sci., 47(Suppl S.): 90-105, 2004. http://219.238.6.200/journal?cmd=journal_detail&jccode=10&year=2004&issue=zk

• Y. Kuzuha, T. M. Over, K. Tomosugi, and T. Kishii, Analysis of multifractal properties of temporal and spatial precipitation data in Japan, J. Hydrosci. Hydraul. Eng., 22(2): 59-78, 2004. http://www.jsce.or.jp/publication/e/list.html

• Ravi, S., P. D‚Odorico, T. M. Over, and T. M. Zobeck, Effect of soil moisture on threshold velocity for wind erosion, Geophys. Res. Let., 31(9): 1-4, 2004. http://www.agu.org/journals/gl/

• S.-W. Lee, A. G. Klein, and T. M. OVER, Effects of El Nino / Southern Oscillation on temperature, precipitation, snow water equivalent and resulting streamflow in the Upper Rio Grande River Basin, Hydrol. Proc., 18(6): 1053-1071, 2004. http://www3.interscience.wiley.com/cgi-bin/jhome/4125

• T. M. Over and P. D’Odorico, “Scaling of surface wind speed”, in Lee, J. A. and Zobeck, T. M., 2002, Proceedings of ICAR5/GCTE-SEN Joint Conference, International Center for Arid and Semiarid Lands Studies, Texas Tech University, Lubbock, Texas, Publication 02-2, pp. 50-53.

• P. D’Odorico, T. M. Over, and J.-C. Yoo, “Stochastic multivariate analysis of hydrometeorological variables for wind erosion models”, in Lee, J. A. and Zobeck, T. M., 2002, Proceedings of ICAR5/GCTE-SEN Joint Conference, International Center for Arid and Semiarid Lands Studies, Texas Tech University, Lubbock, Texas, Publication 02-2, pp. 225-229.

• B. M. Troutman and T. M. Over, “River Flow Mass Exponents with Fractal Channel Networks and Rainfall,” Adv. Water Resour., 24(9/10): 967-989, 2001.  [Link is to the journal; a volume/number search will locate the article]

• P. D’Odorico, J.-C. Yoo, and T. M. Over, “On the Assessment of ENSO-induced Patterns of Rainfall Erosivity in the Southwestern United States,” J. Climate, 14(21): 4230-4242, 2001.  [Link is to the journal; a volume/number search will locate the article]

• T. M. Over and V. K. Gupta, “A Space-Time Theory of Mesoscale Rainfall Using Random Cascades,” J. Geophys. Res., 101(D21): 26,319-26,331, 1996.

• V. K. Gupta, S. L. Castro, and T. M. Over , “On Scaling Exponents of Spatial Peak Flows from Spatial Rainfall and River Network Geometry”, J. Hydrology, 187(1/2), 81-104, 1996.

• T. M. Over and V. K. Gupta, “Statistical Analysis of Mesoscale Rainfall: Dependence of a Random Cascade Generator on the Large-Scale Forcing,” J. Applied Meteorol., 33(12):1526-1542, 1994.

• M. R. Karlinger, T. M. Over and B.M. Troutman, “Relating Thin and Fat-Fractal Scaling of River-Network Models,” Fractals, 2(4):557-565, 1994.

 
Dr. Over is also Eastern Illinois University's representative to the Consortium of Universities for Advancement of Hydrologic Science, Inc. (CUASHI)