Associate Professor
Dept of Geology and Environmental Geosciences
College of Charleston
Charleston, SC USA
phone: (843) 953-5589
fax: -5446
callahant@cofc.edu
Wetlands Hydro & Biogeochem field trip,
Jan. 2007:
Colleton County, South Carolina
(Pond Cypress-Tupelo swamp near the Edisto River)
(right-click and "View Image" to see larger version of each photo)
Coastal Plain Hydrology Group: A consortium of scientists interested in ecohydrology of the Atlantic Coastal Plain of the U.S.
EDUCATION
B.A. Geology, 1991. University of St. Thomas,
St. Paul , Minnesota
M.S. Geochemistry, 1995. New Mexico Institute of Mining and Technology,
Socorro
Ph.D. Earth and
Environmental Science (with Dissertation in Hydrology), 2001. New
Mexico Institute of Mining and Technology
EMPLOYMENT HISTORY
2007-present: Associate Professor of Geology and Environmental Geosciences, College of Charleston
2001-2007: Assistant Professor of Geology and Environmental Geosciences, College of Charleston
1995-2001: Research Assistant (Hydrology and
Geochemistry), Los Alamos National Laboratory
TEACHING Geology Dept and Master of Science in Environmental Studies (MES) Program
Environmental Pollution, EVSS 695 (team-taught with Dr. Vijay Vulava)
Water Resources, GEOL 238
Earth History, GEOL 105
Wetlands, EVSS 639 (team-taught with Dr. Vijay Vulava)
Hydrogeology and Lab, GEOL 438/EVSS 638
Dynamic Earth, GEOL 101
RESEARCH
Interests:
Hydrology and water resources
Groundwater hydrology
Surface water-groundwater interactions
Transport phenomena in fractured media
Wetland hydrology
Current Projects:
Principal Investigator, Hydrology Dynamics and Potential Water Quality Impacts, Turkey Creek Watershed, Francis Marion National Forest and Quinby Creek Watershed, Huger, South Carolina, South Carolina Sea Grant Consortium, $10,500 (8/06-12/07).
PI, An
Integrated Assessment of Prescribed Fire Effects and Monitoring - Sumter and
Francis Marion National Forests, South Carolina, USDA-National Forest Service,
$120,000 (10/03-12/07).
Co-I, Greenhouse Gas Emissions of Natural Bottomland Hardwood Wetlands – A Basis for Assessing Restored Ecosystems, USDA-Forest
Service, Center for Forested Wetlands Research, $25,480 (4/06-12/07).
Co-I, Impacts of Fertilizer Additions on Water Quality in a Controlled-Drainage Pine Plantation, Lower Coastal Plain of the Southeast U.S., USDA-Forest Service, Center for Forested Wetlands Research, $19,000 (8/06-9/07).
Co-I, Stream Gauge Installation and Flow Monitoring in the Francis Marion National Forest, US Geological Survey and USDA-Forest Service, $10,000 annually (1/05 ongoing).
PUBLICATIONS
Pyzoha, J.E., T.J. Callahan,
G. Sun, and C.C. Trettin. 2007. A conceptual hydrologic model for a
forested Carolina bay depressional wetland on the Coastal Plain of
South Carolina, USA. Hydrological Processes (in press).
Reimus, P.W. and T.J. Callahan. 2007. Matrix Diffusion Rates in Fractured Volcanic Rock at the Nevada Test Site: Evidence for a Dominant Influence of Effective Fracture Apertures. Water Resour. Res.43: W07421, doi:10.1029/2006WR005746.
Reimus, P.W., T.J. Callahan, S.D. Ware, M.J. Haga, and D.A. Counce. 2007. Matrix Diffusion Coefficients in Volcanic Rocks at the Nevada Test Site: Influence of Matrix Porosity, Matrix Permeability, and Fracture Coating Minerals. J. Contam. Hydrol. 93:85–95.
Harder, S.V., D.M. Amatya, T.J.
Callahan, C.C. Trettin, and J.
Hakkila. 2007. Hydrology and Water Budget for a First Order Forested Coastal
Plain Watershed, South Carolina. J. Amer.
Water Resour. Assoc. 43(3):563-575, doi: 10.1111/j.1752-1688.2007.00035.x.
Sun, G., T.J. Callahan, J.E. Pyzoha, and C.C. Trettin. 2006.
Modeling the Climatic and Geomorphologic Controls on the Hydrology of a
Carolina Bay Wetland, South Carolina, USA. Wetlands 26(2): 567-580.
Amatya D.M., C.C. Trettin, R.W. Skaggs, M.K. Burke, T.J. Callahan, G. Sun, J.E. Nettles, J.E. Parsons, and M. Miwa. 2005. Five hydrologic
studies conducted by or in cooperation with the Center for Forested Wetlands
Research, USDA Forest Service. USDA Forest Service Report, Research
Paper SRS-40, Asheville, NC.
Dickerson, D. and T.J.
Callahan. 2005. Students'
Conceptions of Scale Regarding Groundwater. J.
Geosci. Educ., 53(4): 374-380.
Sun, G., T.J. Callahan, J.E. Pyzoha, C.C. Trettin, and D.M. Amatya.
2004. Modeling the hydrologic
processes of a depressional forested wetland in South Carolina, U.S.A. In: Proceedings, The
6th Int’l. Conf. on Hydroscience and Engineering (ICHE-2004), 30 May-3 June
2004, Brisbane, Australia.
T.J. Callahan, J.D. Cook,
M.C. Coleman, D.M. Amatya, and C.C. Trettin. 2004. Measuring and Modeling Storm Water Runoff and Soil Interflow in a Managed
Forest, Upper Coastal Plain of the Southeast US. In:
Proceedings of the ASAE/CSAE Annual International Meeting, 1-4 August
2004, Ottawa, Ontario, Canada.
Reimus, P.W., M.J. Haga, A.I. Adams, T.J. Callahan, H.J. Turin,
and D.A. Counce. 2003. Testing and parameterizing a conceptual solute transport
model in saturated fractured tuff using sorbing and nonsorbing tracers in
cross-hole tracer tests. J. Contam. Hyd.
62-63: 613-626.
Callahan, T.J., P.W.
Reimus, P.C. Lichtner, and R.S. Bowman. 2002. Multicomponent effects on the
transport of cations undergoing ion exchange in fractured media. In:
Bridging the Gap Between Measurement and Modeling in Heterogeneous Media (A. N.
Findikakis, ed.). Proceedings of the
Intl. Groundwater Symposium, p. 523-528, Lawrence Berkeley National
Laboratory, 25-28 March 2002, Berkeley, California, USA.
Callahan, T.J., P.W.
Reimus, R.S. Bowman, and M.J Haga. 2000. Using multiple experimental methods to
determine fracture/matrix interactions and dispersion of nonreactive solutes in
saturated volcanic rock. Water Resour.
Res. 36(12): 3547-3558.
PROFESSIONAL ACTIVITIES
Ad hoc reviewer
journals: Water
Resources Research, Restoration Ecology, Journal of Environmental Quality,
Geophysical Research Letters, International Association of Hydraulic Research
proposals: South
Carolina Sea Grant Consortium, US Department of Agriculture National Research
Initiative, National Estuarine Research Reserve Graduate Fellowship
MEMBERSHIP IN PROFESSIONAL SOCIETIES
American
Geophysical Union
Carolina Geological Society
Geological Society of America
Society of Wetland Scientists
Links