Regolith Water in Zero-Order Chaparral and Perennial Grass Watersheds Four Decades after Vegetation Conversion Tanja N. Williamson, Brent D. Newman, Robert C. Graham, and Peter J. Shouse Vadose Zone Journal 2004 3: 3: 1007-1016 doi:10.2136/vzj2004.1007
Tanja N Williamson, Ph. D. (KY)
Soil-water scientist experienced in natural systems, including links with vegetation and landscape dynamics. Previous experience as university professor, independent researcher, and collaborative consultant. Published research supported by OSMRE, USDA, NSF, USEPA, USGS, Kentucky Division of Water, University of the Pacific, and University of California at Riverside.
Biography
Recent and ongoing research includes:
- Hydrologic modeling of mixed land-use watersheds
- the importance of land-cover change to streamflow magnitude, variability, and seasonality
- developing decision-support systems that inform resource managers
- Incorporation of soil-physical data into hydrologic modeling
- Comparison of lab and field measurements to modeled soil properties
- Sensitivity of hydrologic models to changes in soil properties
- Temporal variability of soil-water storage and movement
- Agricultural resilience under projected climate change
- Delineation of ephemeral and intermittent streams in Appalachia
- Conservation management and tile-drainage in agricultural landscapes
- Identifying sediment source
- Linking soil-water storage with the stream environment
Education
Ph.D. Soil and Water Science (Pedology), University of California, Riverside, 1999
M.S. Earth Science (Geomorphology), University of California, Riverside, 1995
B.S. Geoscience, The Pennsylvania State University, 1992 (includes PSU Field Camp)
Professional Experience
U.S. Geological Survey
- Research Hydrologist, Kentucky Water Science Center (2010 to present)
- Hydrologist, Kentucky Water Science Center (2006 to 2010)
Adjunct Assistant Professor, Department of Plant and Soil Sciences, University of Kentucky
Quinte Conservation, Belleville, ON, Canada (2006)
Loyalist College, Belleville, ON, Canada (2004-2005)
University of the Pacific, Stockton, CA, Geosciences (1999-2004)
Science and Products
Date published: April 10, 2019
Status: Active Environmental Effects of Agricultural Practices
As agricultural land in the Minnesota River Basin is retired, tile drains are removed or broken and riparian corridors are planted to reduce runoff. Early studies saw decreased sediment and nitrogen and improved biological indicators but no significant changes in phosphorus. This project continues to investigate the linkages...
Attribution: Upper Midwest Water Science Center
Date published: July 29, 2016
Status: Active Simulation of Soil-Water Availability
How much water is stored in the soil? Does agricultural management affect this? Will this change if temperatures increase and plants need more water?
In order to answer this question, we have focused on the differences in soil physical properties under four land management types (forest, pasture, traditional agriculture, and conservation agriculture) and whether these differences...
Contacts: Tanja N Williamson, Ph. D. (KY)
Date published: July 12, 2016
Status: Active Unmanned Aircraft Systems
The USGS Ohio-Kentucky-Indiana Water Science Center has become a regional leader in using Unmanned Aircraft Systems (UAS), also known as drones, for mapping and hazards analysis.
Contacts: Shawn Meyer, Tanja N Williamson, Ph. D. (KY)
Year Published: 2020
Overall results and key findings on the use of UAV visible-color, multispectral, and thermal infrared imagery to map agricultural drainage pipes
Effective and efficient methods are needed to map agricultural subsurface drainage systems. Visible-color (VIS-C), multispectral (MS), and thermal infrared (TIR) imagery obtained by unmanned aerial vehicles (UAVs) may provide a means for determining drainage pipe locations. Aerial surveys using a UAV with VIS-C, MS, and TIR cameras were conducted...
Allred, Barry J.; Martinez, Luis; Fessehazion, Melake; Rouse, Greg; Williamson, Tanja N.; Wishart, DeBonne; Koganti, Triven; Freeland, Robert; Eash, Neal; Batschelet, Adam; Featheringill, Robert
Year Published: 2019
Tracking phosphorus and sediment sources and transport from fields and channels in Great Lakes Restoration Initiative priority watersheds
A multi-agency, integrated series of studies were initiated in 2017 under the Great Lakes Restoration Initiative (GLRI) by the U.S. Geological Survey, U.S. Forest Service, and the University of Minnesota to quantify the source, downstream travel time, and storage of particulate-bound phosphorus and sediment in agricultural tributaries to the Great...
Williamson, Tanja N.; Fitzpatrick, Faith A.; Karwan, Diana L.; Kolka, Randall K.; Dobrowolski, Edward G.; Blount, James; Pawlowski, Ethan D.View Citation
Williamson, T.N., F.A. Fitzpatrick, D.L. Karwan, R.K. Kolka, E.G. Dobrowolski, J.D. Blount, et al. 2019. Tracking Phosphorus and Sediment Sources and Transport from Fields and Channels in Great Lakes Restoration Initiative Priority Watersheds. In: C. S. P.-P. Chair, editor Federal Interagency Sedimentation and Hydrologic Modeling Conference. Reno, NV. https://www.sedhyd.org/2019/openconf/modules/request.php?module=oc_program&action=view.php&id=79&file=1/79.pdf.
Year Published: 2019
Reduced soil macropores and forest cover reduce warm-season baseflow below ecological thresholds in the upper Delaware River Basin
We examined the impacts of changes in land cover and soil conditions on the flow regime of the upper Delaware River Basin using the Water Availability Tool for Environmental Resources (WATER). We simulated flows for two periods, circa 1600 and 1940, at three sites using the same temperature and precipitation conditions: the East Branch (EB), West...
Endreny, Theodore A.; Kwon, Peter Yong Seuk; Williamson, Tanja N.; Evans, RichardAttribution: Ohio-Kentucky-Indiana Water Science Center
Year Published: 2019
Delineation of tile-drain networks using thermal and multispectral imagery—Implications for water quantity and quality differences from paired edge-of-field sites
As part of the Great Lakes Restoration Initiative, paired edge-of-field sites were established in high priority subwatersheds to assess the effectiveness of agricultural management practices. One pairing was in Black Creek, a tributary to the Maumee River and Lake Erie. These fields were paired because of similarity in soils, topography, and...
Williamson, Tanja N.; Dobrowolski, Edward G.; Meyer, Shawn M.; Frey, Jeffrey W.; Allred, Barry J.
Year Published: 2019
Sensitivity of streamflow simulation in the Delaware River Basin to forecasted land‐cover change for 2030 and 2060
In order to simulate the potential effect of forecasted land‐cover change on streamflow and water availability, there has to be confidence that the hydrologic model used is sensitive to small changes in land cover (<10%) and that this land‐cover change exceeds the inherent uncertainty in forecasted conditions. To investigate this, a 26‐year...
Williamson, Tanja N.; Claggett, Peter R.Attribution: Water, Ohio-Kentucky-Indiana Water Science Center, Indiana, Kentucky, Ohio, United States of America
Year Published: 2017
Multiple-source tracking: Investigating sources of pathogens, nutrients, and sediment in the Upper Little River Basin, Kentucky, water years 2013–14
The South Fork Little River (SFLR) and the North Fork Little River (NFLR) are two major headwater tributaries that flow into the Little River just south of Hopkinsville, Kentucky. Both tributaries are included in those water bodies in Kentucky and across the Nation that have been reported with declining water quality. Each tributary has been...
Crain, Angela S.; Cherry, Mac A.; Williamson, Tanja N.; Bunch, Aubrey R.View Citation
Crain, A.S., Cherry, M.A., Williamson, T.N., and Bunch, A.R., 2017, Multiple-source tracking—Investigating sources of pathogens, nutrients, and sediment in the Upper Little River Basin, Kentucky, water years 2013–14: U.S. Geological Survey Scientific Investigations Report 2017–5086, 60 p., https://doi.org/10.3133/sir20175086.
Year Published: 2017
Water quality and natural resources in the Green River Basin
No abstract available.
Lee, Brad D.; Williamson, Tanja N.; Crain, Angela S.View Citation
Lee, B.D., Williamson, T.N., and Crain, A.S., 2017, Water quality and natural resources in the Green River Basin, in Lee, B.D., Carey, D.I., and Jones, A.L., eds., Water in Kentucky: Natural History, Communities, and Conservation: University Press of Kentucky, p. 133-150.
Year Published: 2016
Sensitivity of the projected hydroclimatic environment of the Delaware River basin to formulation of potential evapotranspiration
The Delaware River Basin (DRB) encompasses approximately 0.4 % of the area of the United States (U.S.), but supplies water to 5 % of the population. We studied three forested tributaries to quantify the potential climate-driven change in hydrologic budget for two 25-year time periods centered on 2030 and 2060, focusing on sensitivity to...
Williamson, Tanja N.; Nystrom, Elizabeth A.; Milly, Paul C.D.View Citation
Williamson T.N., Nystrom E.A., Milly P.C.D. 2016. Sensitivity of the projected hydroclimatic environment of the Delaware River basin to formulation of potential evapotranspiration. Climatic Change 139:215-228. DOI: 10.1007/s10584-016-1782-2.
Year Published: 2015
Classification of ephemeral, intermittent, and perennial stream reaches using a TOPMODEL-based approach
Whether a waterway is temporary or permanent influences regulatory protection guidelines, however, classification can be subjective due to a combination of factors, including time of year, antecedent moisture conditions, and previous experience of the field investigator. Our objective was to develop a standardized protocol using publicly ...
Williamson, Tanja N.; Agouridis, Carmen T.; Barton, Christopher D.; Villines, Jonathan A.; Lant, Jeremiah G.View Citation
Williamson, Tanja N., Carmen T. Agouridis, Christopher D. Barton, Jonathan A. Villines, and Jeremiah G. Lant, 2015. Classification of Ephemeral, Intermittent, and Perennial Stream Reaches Using a TOPMODEL-Based Approach. Journal of the American Water Resources Association (JAWRA) . DOI: 10.1111/1752-1688.12352
Year Published: 2015
Summary of hydrologic modeling for the Delaware River Basin using the Water Availability Tool for Environmental Resources (WATER)
The Water Availability Tool for Environmental Resources (WATER) is a decision support system for the nontidal part of the Delaware River Basin that provides a consistent and objective method of simulating streamflow under historical, forecasted, and managed conditions. In order to quantify the uncertainty associated with these simulations, however...
Williamson, Tanja N.; Lant, Jeremiah G.; Claggett, Peter R.; Nystrom, Elizabeth A.; Milly, Paul C.D.; Nelson, Hugh L.; Hoffman, Scott A.; Colarullo, Susan J.; Fischer, Jeffrey M.Attribution: Water, New Jersey Water Science Center, Ohio-Kentucky-Indiana Water Science Center, Pennsylvania Water Science Center, Water Availability and Use Science Program, Delaware, New Jersey, New York, Pennsylvania
View Citation
Williamson, T.N., Lant, J.G., Claggett, P.R., Nystrom, E.A., Milly, P.C.D., Nelson, H.L., Hoffman, S.A., Colarullo, S.J., and Fischer, J.M., 2015, Summary of hydrologic modeling for the Delaware River Basin using the Water Availability Tool for Environmental Resources (WATER): U.S. Geological Survey Scientific Investigations Report 2015–5143, 68 p., http://dx.doi.org/10.3133/sir20155143.
Year Published: 2015
User manuals for the Delaware River Basin Water Availability Tool for Environmental Resources (DRB–WATER) and associated WATER application utilities
The Water Availability Tool for Environmental Resources (WATER) is a decision support system (DSS) for the nontidal part of the Delaware River Basin (DRB) that provides a consistent and objective method of simulating streamflow under historical, forecasted, and managed conditions. WATER integrates geospatial sampling of landscape characteristics,...
Williamson, Tanja N.; Lant, Jeremiah G.Attribution: Water, Ohio-Kentucky-Indiana Water Science Center, Pennsylvania Water Science Center, Water Availability and Use Science Program, Delaware, New Jersey, New York, Pennsylvania
View Citation
Williamson, T.N., and Lant, J.G., 2015, User manuals for the Delaware River Basin Water Availability Tool for Environmental Resources (DRB–WATER) and associated WATER application utilities: U.S. Geological Survey Open-File Report 2015–1196, 32 p., http://dx.doi.org/10.3133/ofr20151196.
Year Published: 2014
Simulating soil-water movement through loess-veneered landscapes using nonconsilient saturated hydraulic conductivity measurements
Soil Survey Geographic Database (SSURGO) data are available for the entire United States, so are incorporated in many regional and national models of hydrology and environmental management. However, SSURGO does not provide an understanding of spatial variability and only includes saturated hydraulic conductivity (Ksat) values estimated from...
Williamson, Tanja N.; Lee, Brad D.; Schoeneberger, Philip J.; McCauley, W. M.; Indorante, Samuel J.; Owens, Phillip R.Pre-USGS Publications
Effects of a chaparral-to-grass conversion on soil physical and hydrologic properties after four decades Tanja N. Williamson, Robert C. Graham, and Peter J. Shouse Geoderma 2004 123: 1-2: 99-114
Pedogenesis–Terrain Links in Zero-Order Watersheds after Chaparral to Grass Vegetation Conversion Tanja N. Williamson, Paul E. Gessler, Peter J. Shouse, and Robert C. Graham Soil Science Society of America Journal 2006 70: 6: 2065-2074 doi:10.2136/sssaj2003.0316
Identification of stolen rare palm trees by soil morphological and mineralogical properties Brad D. Lee, Tanja N. Williamson, and Robert C. Graham Journal of Forensic Science 2002 47: 190-194
Forensic soils: An integrative laboratory exercise for Introductory Soil Science Brad D. Lee, Tanja N. Williamson, Robert C. Graham, and Lanny J. Lund Journal of Natural Resources and Life Sciences Education 1998 27:110-112