The Bureau of Economic Geology The University of Texas at Austin Jackson School of Geosciences
Todd  Caldwell, Ph. D.
Todd Caldwell, Ph. D. Research Associate Bureau of Economic Geology
The University of Texas at Austin
University Station, Box X
Austin, Texas 78713-8924
E-mail: Telephone: 512-471-2003 Fax: 512-471-0140
Professional Summary
(Click to download)
Research Interests
• Transport of water, solute, and heat through the vadose zone
• Soil, sediment and dust characterization
• Numerical modeling and parameter optimization of soil-atmosphere-plant systems
• Disturbed soils and ecosystem restoration
• Soil geomorphology and landscape evolution
• Ph.D. Hydrogeology, University of Nevada, Reno, 2011
• M.S. Hydrogeology, University of Nevada, Reno, 1999
• B.S. Geology, University of New Mexico, 1997
Professional History
• 2012–present Research Associate, Bureau of Economic Geology
• 2011–2012 Assistant Research Professor, Desert Research Institute
• 2001–2011 Research Scientist, Desert Research Institute
• 2000–2001 Hydrologist, Pacific Northwest National Laboratory
Selected Publications
Caldwell, T.G., M.H. Young, E.V. McDonald, and J. Zhu (2012), Soil heterogeneity in Mojave Desert shrublands: Biotic and abiotic processes, Water Resour. Res., 48, XXXXX, doi:10.1029/20102WR011963.

Flerchinger, G.N., T.G. Caldwell, J. Cho, S.P. Hardegree, (2012), Simultaneous Heat and Water model: Model use, calibration and validation, Trans. ASABE 55:1395-1411.

Rau, B.M., D.W. Johnson, R.R. Blank, A. Lucchesi, T.G. Caldwell, and E.W. Schupp (2011), Transition from sagebrush steppe to annual grass (Bromus tectorum): Influence on belowground carbon and nitrogen, Rangeland Ecology & Management, 64, 139-147.

Rau, B.M., D.W. Johnson, R.R. Blank, R.J. Tausch, B.A. Roundy, R.F. Miller, T.G. Caldwell, and A. Lucchesi (2011), Woodland expansion’s influence on belowground carbon and nitrogen in the Great Basin U.S, J. Arid Environ. 10.1016/j.jaridenv.2011.04.005.

Wilcox, B.P., L. Turnbull, M.H. Young, C.J. Williams, S. Ravi, M.S. Seyfried, D.R. Bowling, R.L. Scott, M.J. Germino, T.G. Caldwell, and J. Wainwright (2011), Invasion of shrublands by exotic grasses: ecohydrological consequences in cold versus warm deserts, Ecohydrology, 10.1002/eco.247.

Bacon, S.N., E.V. McDonald, T.G. Caldwell, and G.K. Dalldorf (2010), Timing and distribution of alluvial fan sedimentation in response to strengthening of the late Holocene ENSO variability in the Sonoran Desert, southwestern Arizona, USA, Quaternary Research 73:425-438.

Caldwell, T.G., D.W. Johnson, W.W. Miller, R.G. Qualls, and R.R. Blank (2009), Prescription fire and anion retention in Tahoe forest soils, Soil Sci. 174:594-600.

Caldwell, T.G., E.V. McDonald, and M.H. Young (2009), The seedbed microclimate and active revegetation of disturbed lands in the Mojave Desert, J. Arid Environ. 73:563-573.

Stevenson, B.A., E.V. McDonald, T.G. Caldwell (2009), Root patterns for Larrea tridentata in relation to soil morphology in Mojave Desert soils of different ages. In R.H. Webb, L.F. Fenstermaker, J.S. Heaton, D.L. Hughson, E.V. McDonald, and D.M. Miller (eds.) The Mojave Desert: Ecosystem Processes and Sustainability. University of Nevada Press. Pp. 312-338.

Young, M.H., T.G. Caldwell, D.G. Meadows, and L.F. Fenstermaker (2009), Variability of soil physical and hydraulic properties at the Mojave Global Change Facility, Nevada: Implications for water budget and evapotranspiration, J. Arid Environ., 73:733-744.

Caldwell, T.G., M.H. Young, J. Zhu, and E.V McDonald (2008), Spatial structure of hydraulic properties from canopy to interspace in the Mojave Desert, Geophys. Res. Lett. 35, L19406, doi:10.1029/2008GL035095.

Caldwell, T.G., E.V. McDonald, S.N. Bacon, and G. Stullenbarger (2008), The performance and sustainability of vehicle dust courses for desert military testing, J. Terramechanics 45:213-221.

Bacon, S.N., E.V. McDonald, S. Baker, T.G. Caldwell, and G. Stullenbarger (2008), Desert terrain characterization of landforms and surface cover within vehicle test courses at U.S. Army Yuma Proving Ground, USA, J. Terramechanics 45:167-183.

McDonald, E.V., and T.G. Caldwell (2008), Geochemical characteristics of Iraqi dust and soil samples and related impacts to weapon malfunction, p. 258-265. In, C.P. Nathanail, R.J. Abrahart, and R.P. Bradshaw (eds.) Military Geography and Geology: History and technology. Land Quality Press, Nottingham, UK.

Shafer, D.S., M.H. Young, S.F. Zitzer, T.G. Caldwell and E.V. McDonald (2007), Interrelated pedogenic, hydraulic, biotic and abiotic processes during the past 125 000 years of landscape evolution in the northern Mojave Desert, Nevada, USA, J. Arid Environ. 69:633-657.

Caldwell, T.G., E.V. McDonald, and M.H. Young (2006), Soil disturbance and hydrologic response at the National Training Center, Ft. Irwin, California, J. Arid Environ. 67:456-472.

Johnson, D.W., R.B. Susfalk, T.G. Caldwell, J.D. Murphey, W.W. Miller, and R.F. Walker (2004), Fire effects on carbon and nitrogen budgets in forests, Water Air Soil Pollut. 4:263-275.

Young, M.H., E.V. McDonald, T.G. Caldwell, S.G. Benner, and D.G. Meadows (2004), Hydraulic Prop
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