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John Walker

Research Hydrologist

Contact Info


Short Biography

 

I have focused on conducting research investigating groundwater and surface water in natural systems and the application of statistics to a variety of problems in hydrology during my career with the USGS. This research effort has used a variety of approaches such as traditional field investigations using ion and isotope chemistry, hydrologic modeling and novel application of statistical methods.  Recently my work has included research investigating the use of parameter estimation for calibrating complicated hydrologic models, and applying the models to project hydrologic changes from climate and land-use change.

 



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Publications

Graczyk, David J. ; Walker, John F. ; Bannerman, Roger T. ; Rutter, Troy D., 2012. Effects of best-management practices in Eagle and Joos Valley Creeks in the Waumandee Creek Priority Watershed, Wisconsin, 1990-2007. U.S. Geological Survey Scientific Investigations Report 2011-5119, v, 25 p. [Link]

Markstrom, Steven L.; Hay, Lauren E.; Ward-Garrison, D. Christian; Risley, John C.; Battaglin, William A.; Bjerklie, David M.; Chase, Katherine J.; Christiansen, Daniel E.; Dudley, Robert W.; Hunt, Randall J.; Koczot, Kathryn M.; Mastin, Mark C.; Regan, R. Steven; Viger, Roland J.; Vining, Kevin C.; Walker, John F., 2012. Integrated watershed-scale response to climate change for selected basins across the United States. U.S. Geological Survey Scientific Investigations Report 2011-5077, x, 134 p.; Appendix [Link]

Hunt, Randall J.; Walker, John F.; Westenbroek, Steven M.; Hay, Lauren E.; Markstrom, Steven L., 2012. Watershed scale response to climate change--Black Earth Creek Basin, Wisconsin. U.S. Geological Survey Fact Sheet 2011-3129, 6 p. [Link]

Walker, John F.; Hunt, Randall J.; Hay, Lauren E.; Markstrom, Steven L., 2012. Watershed scale response to climate change--Trout Lake Basin, Wisconsin. U.S. Geological Survey Fact Sheet 2011-3119, 6 p. [Link]

Westenbroek, Stephen M.; Doherty, John; Walker, John F.; Kelson, Victor A.; Hunt, Randall J.; Cera, Timothy B., 2012. Approaches in highly parameterized inversion: TSPROC, a general time-series processor to assist in model calibration and result summarization. U.S. Geological Survey Techniques and Methods 7-C7, Report: viii, 101 p.; Download Software

Gebert, Warren A.; Walker, John F.; Kennedy, James L., 2011. Estimating 1970-99 average annual groundwater recharge in Wisconsin using streamflow data. U.S. Geological Survey Open-File Report 2009-1210, iv, 13 p.; Appendices [Link]

Gebert, Warren A.; Walker, John F.; Hunt, Randall J., 2011. Groundwater recharge in Wisconsin--Annual estimates for 1970-99 using streamflow data. U.S. Geological Survey Fact Sheet 2009-3092, 4 p. [Link]

Walker, John F.; Hay, Lauren E.; Markstrom, Steven L.; Dettinger, Michael D., 2011. Characterizing climate-change impacts on the 1.5-yr flood flow in selected basins across the United States: a probabilistic approach. American Meteorological Society , 16 p.

Hunt, R.J., Walker, J.F., and Doherty, J., 2009 Parameter estimation and coupled groundwater/surface-water models: A PEST approach, in Conference Proceedings from the 1st PEST Conference, Potomac, MD, S.S. Papadopulus and Associates, Inc.

Walker, J.F., Hunt, R.J., Doherty, J., and Hay, L., 2009 Processing time-series data to calibrate a surface-water model in small headwater watersheds, in Conference Proceedings from the 1st PEST Conference, Potomac, MD, S.S. Papadopulus and Associates, Inc.

Walker, J.F., Hunt, R.J., Markstrom, S.L., Hay, L.E., and Doherty, J., 2009, Using a Coupled Ground-Water/Surface-Water Model to Predict Climate-Change Impacts to Lakes in the Trout Lake Watershed, Northern Wisconsin, in 3rd Interagency Conference on Research in the Watersheds, Estes Park, CO, U.S. Geological Survey, p. 155-161.

Fitzpatrick, Faith A.; Peppler, Marie C.; Walker, John F.; Rose, William J.; Waschbusch, Robert J.; Kennedy, James L., 2008. Flood of June 2008 in Southern Wisconsin. U.S. Geological Survey Scientific Investigations Report 2008-5235, Report: vi, 25 p.; Appendixes; Data Files [Link]

Hunt, R., Walker, J.F., and Strand, M., 2008, Simulating sensitivity to climate change in the Trout Lake Watershed, northern Wisconsin, USA, in IAH XXXVI International Meeting, Toyama, Japan, IAH, p. 45-49.

Hunt, R.J., Prudic, D., Walker, J.F., and Anderson, M.P., 2008, The importance of simulating unsaturated zone flow in a transient ground-water flow model of the Trout Lake Basin, northern Wisconsin: Ground Water, v. 46, no. 4, p. 551-560.

Hunt, R.J., Walker, J.F., and Doherty, J., 2008, Using GSFLOW to simulate climate change in a northern temperate climate, in MODFLOW and More: Ground Water and Public Policy, Golden, CO, International Groundwater Modeling Center, p. 109-113.

Shanley, J.B., Mast, M.A., Campbell, D.H., Aiken, G.R., Krabbenhoft, D.P., Hunt, R.J., Walker, J.F., Schuster, P.F., Chalmers, A., Aulenbach, B.T., Peters, N.E., Marvin-DiPasquale, M., Clow, D.W., and Shafer, M.M., 2008, Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach: Environmental Pollution, v. 154, no. 1, p. 143-154.

Lowry, C.S., Walker, J.F., Hunt, R., and Anderson, M.P., 2007, Identifying spatial variability of groundwater discharge in a wetland stream using a distributed temperature sensor: Water Resources Research, v. 43, p. W10408.

Walker, J.F., Hunt, R.J., and Saad, D.A., 2007, Dynamics of CFCs in northern temperate lakes and adjacent groundwater: Water Resources Research, v. 43, p. W04423.

Hunt, R.J., Strand, M., and Walker, J.F., 2006, Measuring groundwater-surface water interaction and its effect on wetland stream benthic productivity, Trout Lake watershed, northern Wisconsin, USA: Journal of Hydrology, v. 320, p. 370-384.

Peters, N.E., Shanley, J.B., Aulenbach, B.T., Webb, R.M., Campbell, D.H., Hunt, R., Larsen, M.C., Stallard, R.F., Troester, J., and Walker, J.F., 2006, Water and solute mass balance of five small, relatively undisturbed watersheds in the U.S.: Science of the Total Environment, v. 358, p. 221- 242.

Corsi, Steven R.; Walker, John F.; Wang, Lizhu; Horwatich, Judy A.; Bannerman, Roger T., 2005. Effects of best-management practices in Otter Creek in the Sheboygan River Priority Watershed, Wisconsin, 1990-2002. Scientific Investigations Report 2005-5009, 34 p. [Link]

Walker, John F.; Hughes, Peter E., 2005. Bridge scour monitoring methods at three sites in Wisconsin. Open-File Report 2005-1374, 14 p. : ill. [Link]

Graczyk, David J.; Walker, John F.; Horwatich, J. A.; Bannerman, Roger T., 2003. Effects of best-management practices in the Black Earth Creek Priority Watershed, Wisconsin, 1984-98. Water-Resources Investigations Report 2003-4163, vi, 24 p. : ill., maps ; 28 cm. [Link]

Walker, John F.; Krug, William R., 2003. Flood-frequency characteristics of Wisconsin streams. Water-Resources Investigations Report 2003-4250, 42 p.; 2 plates [Link]

Corsi, S.R., Walker, J.F., Waschbusch, R.J., and Standridge, J., 2003, Sources and Variability of Cryptosporidium in the Milwaukee River Watershed: Water Environment Research Foundation 99-HHE-2, 114 p.

Walker, J.F., Hunt, R.J., Bullen, T.D., Krabbenhoft, D.P., and Kendall, C., 2003, Spatial and temporal variability of isotope and major ion chemistry in the Allequash Creek basin, northern Wisconsin: Ground Water, v. 41, no. 7, p. 883-902.

Walker, John F.; Graczyk, D. J.; Corsi, Steven R.; Wierl, J. A.; Owens D. W., 2001. Evaluation of nonpoint-source contamination, Wisconsin: water year 1999. Open-File Report 2001-105, iv, 37 p. : ill., map ; 28 cm.

Walker, John F.; Bullen, Thomas D., 2000. Trout Lake, Wisconsin: A Water, Energy, and Biogeochemical Budgets Program Site. U.S. Geological Survey, Fact Sheet 161-99, 1 folded sheet ([4] p.) : col. ill., col. map ; 28 cm. col. ill., col. map ; [Link]

Hunt, R.J., Walker, J.F., and Krabbenhoft, D.P., 1999, Characterizing hydrology and the importance of ground-water discharge in natural and constructed wetlands: Wetlands, v. 19, no. 2, p. 458-472.

Walker, J.F., and Krabbenhoft, D.P., 1998, Groundwater and surface-water interactions in riparian and lake-dominated systems, in McDonnell, J.J., and Kendall, C., eds., Isotope tracers in catchment hydrology: Amsterdam, The Netherlands, Elsevier, p. 467-488.

Walker, J.F., Saad, D.A., and Krohelski, J.T., 1997, Optimization of ground-water withdrawal in the lower fox river communities, Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 97-4218, 24 p.

Walker, J.F., and Wang, D., 1997, Measurement of flow under ice covers in North America: Journal of Hydraulic Engineering, v. 123, no. 11, p. 1037-1040.

Corsi, Steven R.; Walker, John F.; Graczyk, D. J.; Greb, S. R.; Owens, D. W.; Rappold, K. F., 1995. Evaluation of nonpoint-source contamination, Wisconsin; selected streamwater-quality data, land-use and best-management practices inventory, and quality assurance and quality control, water year 1993. U.S. Geological Survey ; Earth Science Information Center, Open-File Reports Section [distributor], Open-File Report 94-707-W, 57 p.

Walker, J.F., Graczyk, D.J., Corsi, S.R., Owens, D.W., and Wierl, J.A., 1995, Evaluation of nonpoint-source contamination, Wisconsin: land-use and best-management practices inventory, selected streamwater-quality data, urban-watershed quality assurance and quality control, constituent loads in rural streams, and snowmelt-runoff analysis, water year 1994: U.S. Geological Survey Open-File Report 95-320.

Teal, M.J., Ettema, R., and Walker, J.F., 1994, Estimation of mean flow velocity in ice-covered channels: Journal of Hydraulic Engineering, v. 120, no. 12, p. 1385-1400.

Walker, J.F., 1994, Statistical techniques for assessing water-quality effects of BMPs: Journal of Irrigation and Drainage Engineering, v. 120, no. 2, p. 334-347.

Walker, J.F., 1994, Analysis of velocity profiles under a solid ice cover, in River Ice Seminar, Minneapolis, Minnesota, National Weather Service, p. 93-95.

Walker, J.F., 1994, Methods of measuring discharge under an ice cover: Journal of Hydraulic Engineering, v. 120, no. 11, p. 1327-1336.

Walker, J.F., 1994, Statistical techniques for assessing water-quality effects of BMPs: Journal of Irrigation and Drainage Engineering, v. 120, no. 2, p. 334-347.

Graczyk, D.J., Walker, J.F., Greb, S.R., Corsi, S.R., and Owens, D.W., 1993, Evaluation of nonpoint-source contamination, Wisconsin: selected data for 1992 water year: U.S. Geological Survey Open-File Report 93-630, 48 p.

Walker, J.F., 1993, Techniques for detecting effects of urban and rural land-use practices on stream-water chemistry in selected watersheds in Texas, Minnesota, and Illinois: U.S. Geological Survey Open-File Report 93-130.

Walker, J.F., and Graczyk, D.J., 1993, Preliminary evaluation of effects of best management practices in the Black Earth Creek, Wisconsin, priority watershed: Water Science and Technology, v. 28, no. 3-5, p. 539-548.

Elder, John F.; Krabbenhoft, David P.; Walker, John F. , 1992. Water, Energy, and Biogeochemical Budgets (WEBB) program; data availability and research at the Northern Temperate Lakes site in north-central Wisconsin. U.S. Geological Survey ; Books and Open-File Reports Section [distributor], Open-File Report 92-48, iv, 15 p. ill. ;28 cm.

Melcher, N.B., and Walker, J.F., 1992, Evaluation of selected methods for determining streamflow during periods of ice effect: U.S. Geological Survey Water-Supply Paper 2378, 47 p.

Walker, J.F., 1991, Accuracy of selected techniques for estimating ice-affected streamflow: Journal of Hydraulic Engineering, v. 117, no. 6, p. 697-712.

Hirsch, R.M., Walker, J.F., Day, J.C., and Kallio, R., 1990, Chapter 13: The influence of man on hydrologic systems, in Wolman, M.G., and Riggs, H.C., eds., Surface water hydrology: Boulder, CO, Geological Society of America, The Geology of North America, v. O-1, p. 329-359.

Melcher, N.B., and Walker, J.F., 1990, Evaluation of selected methods for determining streamflow during periods of ice effect: U.S. Geological Survey Open-File Report 90-554, 58 p.

Walker, J.F., Pickard, S.A., and Sonzogni, W.C., 1989, Spreadsheet watershed modeling for nonpoint-source pollution management in a Wisconsin basin, v. 25, no. 1, p. 139-147.

Walker, J.F., 1988, General two-point method for determining velocity in open channel, v. 114, no. 7, p. 801-805.

Walker, J.F., Osen, L.L., and Hughes, P.E., 1987, Cost effectiveness of the U.S. Geological Survey's stream-gaging program in Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 86-4125, 44 p.




Potter, K.W., and Walker, J.F., 1985, An empirical study of flood measurement error: Water Resources Research, v. 21, no. 3, p. 403-406.

Walker, J.F., 1985, The impact of measurement error on the at-site flood frequency problem: Madison, WI, University of Wisconsin, Ph.D., 207 p.

Potter, K.W., and Walker, J.F., 1982, Modeling the error in flood discharge measurements, in Shaarawi, A.H., and Esterby, S.W., eds., Developments in Water Science, Volume 17, Time Series Methods in Hydroscience: Amsterdam, Netherlands, Elsevier Sci. Publ. Co., p. 405-413.

Potter, K.W., and Walker, J.F., 1981, A model of discontinuous measurement error and its effects on the probability distribution of flood discharge measurements, v. 17, no. 5, p. 1505-1509.

Walker, J.F., 1981, The impact of measurement error on the probability distribution of measureed flood discharges: Madison, WI, University of Wisconsin, M.S., 95 p.




                           

My Science Topics


Science Topic
Subtopic
Hydrologic Processesground-water flow
Hydrologic Processeshydrology
Hydrologic Processesrunoff
Hydrologic Processesstreamflow
Hydrologic Processeswater cycle



My USGS Science Strategy Areas

Understanding Ecosystems & Predicting Ecosystems Change

Climate Variability & Change

Research Focus Areas

Ground-water/surface-water interactions, including hydrology and geochemistry; modeling climate and land-use change impacts on hydrologic systems; flood frequency analysis and prediction; assessing the effectiveness of nonpoint best-management practices; hydraulics of flow under ice.


Contact Information

John Walker
8505 Research Way
Middleton, WI 53562-0000
608-821-3853
608-821-3817 - Fax
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