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THOMAS M. OVER, Hydrologist


EDUCATION

Ph.D. in Geophysics, Hydrology Option, University of Colorado, Boulder, 1995. Dissertation: Modeling Space-Time Rainfall at the Mesoscale Using Random Cascades

M.S. in Water Resources Engineering, Department of Civil Engineering, Stanford University, 1984

B.S. in Civil Engineering, Massachusetts Institute of Technology, 1983

STARTED WITH THE USGS -- 2001

OTHER EXPERIENCE

Associate Engineer, Nolte and Associates, San Jose, CA, 1984-1988

Assistant Professor, Department of Civil Engineering, Texas A&M University, 1996-2000

Visiting Professor, Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 2000-2001

Research Professor, Department of Geology / Geography, Eastern Illinois University, 2000 to present

AREAS OF EXPERTISE

  • Stochastic hydrology
  • Rainfall-runoff modeling
  • Climatology

PROFESSIONAL AFFILIATIONS

Professional Engineer, State of California, 1986 to present

Member, American Geophysical Union, American Meteorological Society, American Society of Civil Engineers, American Water Resources Association, American Society for Engineering Education, and European Geophysical Society.

PUBLICATIONS

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Journal Articles

S. Ravi, 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, in press, 2005.

R. Rigon, G. Bertoldi, and T. M. OVER, "GEOtop: A distributed hydrological model with coupled water and energy budgets", J. Hydrometeorology, in press, 2005.

G. Bertoldi, R. Rigon, and T. M. OVER, "Impact of watershed geomorphic characteristics on the energy and water budgets", J. Hydrometeorology, in press, 2005.

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.

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.

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.

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.

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.

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.

B. M. Troutman and T. M. OVER, River Flow Mass Exponents with Fractal Channel Networks and Rainfall, Adv. Water Resour., 14(21): 4230-4242, 2001.

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, A Space-Time Theory of Mesoscale Rainfall Using Random Cascades, J. Geophys. Res., 101(D21): 26,319-26,331, 1996.

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.

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.

USGS-Related Conference Presentations


T. M. Over, J. J. Duncker, and J. A. Gonzalez-Castro, "Comparison of Estimates of Uncertainty of Discharge at U.S. Geological Survey Index-Velocity Gages on the Chicago Sanitary and Ship Canal, Illinois", Proceedings of the ASCE-EWRI World Water & Environmental Resources Congress, Salt Lake City, Utah, June 27- July 1, 2004.

E. Murphy, T.M. OVER, T. Ortel, A.L. Ishii, "Comparisons between MPE NEXRAD Radar and Gage Rainfall Data in and near DuPage County, Illinois", presented at Illinois Water 2004, October 13-14, 2004, Urbana, Illinois.

T. M. OVER, "Index velocity-based Discharge Error Estimates at AVM Gages", presented at 2004 USGS Hydroacoustics Workshop, San Diego, California, March, 2004.

T. M. OVER and J. J. Duncker, "Uncertainty Analysis of Discharge at an Acoustic Velocity Meter Gaging Stations on the Chicago River System, Illinois", presented at USGS National Surface Water Meeting, San Antonio, Texas, November, 2003.

A. L. Ishii, T. W. Ortel, T. M. OVER, and E. A. Murphy, "Nexrad and rainfall-gage precipitation inputs for near real-time flood simulation of Salt Creek in Du Page County, Illinois" (abstract) in 2003 National Hydrologic Warning Council/Southwestern Association of ALERT Systems Abstracts, Dallas, October, 2003, p. 43.

Other Conference Presentations


T.M. OVER and P. D.Odorico, "Multivariate stochastic modeling of hourly hydroclimatic variables and its effect on wind erosion predictions", presented at the European Geosciences Union General Assembly, Vienna, Austria, April 2005.

S. Ravi, T.M. Zobeck, P. D.Odorico, T.M. OVER, "The wet bonding forces in soils and their effect threshold friction velocity of wind erosion", presented at the European Geosciences Union General Assembly, Vienna, Austria, April 2005.

Y. Kuzuha, T.M. Over, K. Tomosugi, T. Kishii, "PUB by using scaling: Criterion to distinguish simple scaling from multiscaling", presented at VIIth IAHS Scientific Assembly, Foz do Iguacu, Brazil, April 2005.

T.M. OVER, Y. Zhang, P. D.Odorico, and K.E. Kunkel, "Soil moisture . precipitation feedback in the U.S. Midwest: An empirical study, presented at the Illinois State Academy of Science Annual Meeting, Galesburg, Illinois, April 2005.

J. Coons, H.R. Owen, T.M. OVER, and V.P. Gutowski, "Status of the silvery bladderpod (Lesquerella ludoviciana): An Illinois endangered species on the edge", presented at 31st Natural Areas Conference, Chicago, Illinois, October, 2004.

R. Rigon, G. Bertoldi, T.M. OVER, and D. Tamanini, "GEOTOP: a distributed model of the hydrological cycle in the remote sensing era", presented at CAHMDA-II: International Workshop on the Terrestrial Water Cycle: Modeling and Data Assimilation Across Catchment Scales, Princeton, NJ, October, 2004.

M. Gebremichael, T. M. OVER, and W. F. Krajewski, "Comparison of the scaling characteristics of rainfall dervied from space-based and ground-based radar observations", presented at AGU Spring Meeting, Montreal, Canada, May, 2004.

S. Ravi, P. D.Odorico, T. M. OVER, and T. M. Zobeck, "On the effect of air humidity on soil susceptibility to wind erosion", presented at AGU Spring Meeting, Montreal, Canada, May, 2004.

E. Kenney, F. L. Ogden, and T. M. OVER, "Examining Runoff Production Using Radar-Rainfall and Physiographic Databases", presented at AGU Fall Meeting, San Francisco, December, 2003.

T. M. OVER and P. D.Odorico, "Scaling of Surface Wind Speed", in Lee, J. A. and Zobeck, T. M., 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, 2002.

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., 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, 2002.

S.-W. Lee, A. G. Klein, and T. M. Over, "Effects of the El Nino/Southern Oscillation on Temperature, Precipitation, Snow Covered Area and Resulting Streamflow in the Upper Rio Grande River Basin", Eastern Snow Conference, Stowe, Vermont, May, 2002.

T. M. OVER, "Construction and Tests of a Multifractal Model of Space-Time Rainfall", 7th International Conference on Precipitation, Rockport, ME, July, 2001 and TIES-2001, The International Environmetrics Society, Portland, OR, August, 2001.

Bertoldi, G., Rigon, R., and T. M. OVER, "GEOTOP, a model of the hydrological cycle for small catchments and hillslopes", presented at the AGU Chapman Conference on the State-of-the-Art in Hillslope Hydrology, Sunriver, OR, October, 2001.

S.-W. Lee, A. G. Klein and T. M. OVER, "Effects of the El Nino / Southern Oscillation on Precipitation, Temperature and Snow Distribution in the Upper Rio Grande River Basin", Eastern Snow Conference, Ottawa, Canada, 2001.

C.-M. Wang and T. M. OVER, "Toward a Theory of Space-Time Streamflow: Some Properties of Output of a Quasi-Distributed Model", American Geophysical Union (AGU) Fall Meeting, San Francisco, December, 2000.

T. M. OVER and V. K. Gupta, "Parameter Estimation and Applications of Temporally Evolving Spatial Cascade Rainfall Models," AGU Fall Meeting, San Francisco, December, 1999.

T. M. OVER, "Properties of Time Series from a Causal Space-Time Multifractal Rainfall Model", SESS-TIES '99: International Conference on Environmetrics and Statistics in the Earth and Space Sciences, Athens, Greece, August, 1999.

T. M. OVER and J. R. Wyrick, "Regionalization Study of Hierarchically Calibrated Flows on a Densely Gaged Experimental Watershed," AGU Spring Meeting, Boston, MA, June, 1998.

T. M. OVER, "Relations Among Scaling Properties of Precipitation, Topography, Soil Moisture, and Floods," AGU Chapman Conference on Fractal Scaling, Non-linear Dynamics, and Chaos in Hydrologic Systems, Clemson, SC, May, 1998.

T. M. OVER, "The Variability of Flood Event Peaks from a Scaling Perspective: an Empirical Investigation," AGU Spring Meeting, Baltimore, MD, May, 1997.

T. M. OVER and V. K. Gupta, "Sampling Effects in the Scaling of Peak Floods and Their Implications for Design of Field Experiments," AGU Fall Meeting, San Francisco, December, 1996.

T. M. OVER, V. K. Gupta and S. L. Castro, "On Scaling Invariance in the Spatial Structure of Peak Flows from Space-Time Rainfall Variability and River Network Geometry: An Example", Workshop on Scale Problems in Hydrology, Krumbach, Austria, 1996.

T. M. OVER and V. K. Gupta, "Comparison of Scaling Properties of GATE and TOGA-COARE Radar Precipitation Fields with Implications for Remote Sensing," AGU Spring Meeting, Baltimore, MD, May, 1996.


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