USGS - science for a changing world

USGS NRP Tucson: Landscape Change in the Southwest

Personnel

Affiliated Staff

Emeritus Staff

Robert Webb

Robert Webb

U.S. Geological Survey
520 N Park Ave
Tucson AZ 85719

520 670-6671 ext 238

Education

Ph.D in Geosciences, minor in Civil Engineering, University of Arizona, 1985.

M.S. in Applied Earth Sciences, Stanford University, 1980.

B.S. in Engineering, minors in Biology and Mathematics, University of Redlands, 1978.

Professional Experience

2003-present: Adjunct Associate Professor, Department of Geosciences, University of Arizona.

2002-2004: Research Advisor, Geomorphology/Sediment Transport Group.

1998-present: Adjunct Associate Professor, Hydrology Department, University of Arizona.

December 1992-1995: Research Advisor, Geomorphology/Sediment Transport Group.

December 1990-1992: Assistant RA, Geomorphology/Sediment Transport Group.

1989: Adjunct Associate Research Scientist, Geosciences Department, University of Arizona.

October 1989-Present: Hydrologist with National Research Program, USGS.

Oct 1985-Sep 1988: Hydrologist with Arizona District, USGS.

Oct 1983-Oct 1985: Graduate student appointment with USGS.

Jan 1982-Oct 1983: Research associate, University of Arizona.

May 1981-Sep 1983: Geologic field assistant, Geologic Division, USGS.

Sep 1979-Jan 1981: Hydrologic field assistant, USGS.

June-August 1977: Geologic field assistant, Geologic Division, USGS.

Bibliography

Webb, R.H., and Wilshire, H.G., 1978, An annotated bibliography on the effects of off-road vehicles on the environment: U.S. Geological Survey Open-file Report 78-149, 21 p.

Webb, R.H., Ragland, H.C., Godwin, W.H., and Jenkins, D., 1978, Environmental effects of soil property changes with off-road vehicle use: Environmental Management, v. 2, no. 3, p. 219-233.

Webb, R.H., and Stielstra, S.S., 1979, Sheep grazing effects on Mojave Desert vegetation and soils: Environmental Management, v. 3, no. 6, p. 517-529.

Webb, R.H., and Wilshire, H.G., 1979, Recovery of soils and vegetation in a Mojave Desert ghost town, Nevada, U.S.A.: Journal of Arid Environments, v. 3, no. 6, p. 291-303.

Webb, R.H., 1980, An annotated bibliography on the effects of livestock grazing on soils, vegetation, and wildlife: Riverside, California, Report to the Bureau of Land Management, Desert Plan Staff, 63 p.

Iverson, R.M., Hinckley, B.S., Webb, R.H., and Hallet, Bernard, 1981, Physical effects of vehicular disturbances on arid landscapes: Science, v. 212, p. 915-917.

Webb, R.H., 1982, Off-road motorcycle effects on a desert soil: Environmental Conservation, v. 9, no. 3, p. 197-208.

Webb, R.H., and Newman, E.B., 1982, Recovery of soils and vegetation in Mojave Desert ghost towns: Environmental Conservation, v. 9, no. 3, p. 245-248.

Webb, R.H., and Wilshire, H.G. (eds.), 1983, Environmental effects of off-road vehicles: New York, Springer-Verlag Publishers, 534 p.

Webb, R.H., 1983, Compaction of desert soils by off-road vehicles, in Webb, H.G., and Wilshire, H.G. (eds.), Environmental effects of off-road vehicles: New York, Springer-Verlag Publishers, p. 51-79.

Webb, R.H., Wilshire, H.G., and Henry, M.A., 1983, Natural recovery of soil and vegetation following human disturbance, in Webb, R.H., and Wilshire, H.G. (eds.), Environmental effects of off-road vehicles: New York, Springer-Verlag Publishers, p. 279-302.

Cole, K., and Webb, R.H., 1985, Late Holocene vegetation changes in Greenwater Valley, Mojave Desert, California: Quaternary Research, v. 23, p. 227-235.

Webb, R.H., 1986, Spatial and temporal distribution of radiocarbon ages on rodent middens from the southwestern United States: Radiocarbon, v. 28, no. 1, p. 1-8.

O'Connor, J.E., Webb, R.H., and Baker, V.R., 1986, Paleohydrology of pool and riffle pattern development, Boulder Creek, Utah: Geological Society of America Bulletin, v. 97, p. 410-420.

Webb, R.H., Steiger, J.W., and Wilshire, H.G., 1986, Recovery of compacted soils in Mojave Desert ghost towns: Soil Science Society of America Journal, v. 50, p. 1341-1344.

Webb, R.H., Steiger, J.W., and Turner, R.M., 1987, Dynamics of Mojave Desert shrub vegetation in the Panamint Mountains: Ecology, v. 50, p. 478-490.

Webb, R.H., 1987, Debris flows in tributaries of the Colorado River in Grand Canyon National Park, Arizona: Executive summary: U.S. Geological Survey Open-File Report 87-117, 12 p.

Webb, R.H., 1987, Occurrence and geomorphic effects of streamflow and debris flow floods in southern Utah and northern Arizona, in Mayer, Larry, and Nash, D.B. (editors), Catastrophic flooding: Boston, Allen and Unwin, p. 247-265.

Webb, R.H., Rink, G.R., and Favor, B.O., 1987, Distribution of radionuclides and trace elements in ground water, grasses, and surficial sediments associated with the alluvial aquifer along the Puerco River, northeastern Arizona--A reconnaissance sampling program: U.S. Geological Survey Open-File Report 87-206, 108 p.

Webb, R.H., Rink, G.R., and Radtke, D.B., 1987, Preliminary assessment of water quality in the alluvial aquifer of the Puerco River basin, northeastern Arizona: U.S. Geological Survey Water-Resources Investigations 87-4126, 70 p.

Baker, V.R., Pickup, Geoff, and Webb, R.H., 1987, Paleoflood hydrologic analysis at ungaged sites, central and northern Australia, in Singh, V. (editor), Regional Flood-Frequency Analysis: Dordrect, The Netherlands, D. Reidel Publishers, p. 321-334.

Webb, R.H., and Baker, V.R., 1987, Changes in hydrologic conditions related to large floods on the Escalante River, south-central Utah, in Singh, V. (editor), Regional Flood-Frequency Analysis: Dordrect, The Netherlands, D. Reidel Publishers, p. 306-320.

Webb, R.H., Steiger, J.W., and Newman, E.B., 1988, The effects of disturbance on desert vegetation in Death Valley National Monument, California: U.S. Geological Survey Bulletin 1793, 103 p.

Webb, R.H., Pringle, P.T., Reneau, S.L., and Rink, G.R., 1988, The 1984 Monument Creek debris flow: Implications for the formation of rapids on the Colorado River in Grand Canyon National Park: Geology, v. 16, p. 50-54.

Webb, R.H., O'Connor, J.E., and Baker, V.R., 1988, Paleohydrologic reconstruction of flood frequency on the Escalante River, south-central Utah, in Baker, V.R., Kochel, R.C., and Patton, P.C. (editors), Flood geomorphology: New York, John Wiley and Sons, p. 403-418.

O'Connor, J.E., and Webb, R.H., 1988, Hydraulic modeling for paleoflood analysis, in Baker, V.R., Kochel, R.C., and Patton, P.C. (editors), Flood geomorphology: New York, John Wiley and Sons, p. 393-402.

Webb, R.H., Pringle, P.T., and Rink, G.R., 1989, Debris flows in tributaries of the Colorado River in Grand Canyon National Park, Arizona: U.S. Geological Survey Professional Paper 1492, 39 p.

Webb, R.H., and Rathburn, S.L., 1989, Paleoflood hydrologic research in the southwestern United States: Transportation Research Board Record 1201, p. 9-21.

Webb, R.H., and Betancourt, J.L., 1990, Climatic effects on flood frequency: An example from southern Arizona, in Betancourt, J.L., and MacKay, A.M. (editors), Proceedings of the Sixth Annual Pacific Climate (PACLIM) Workshop, March 5-8, 1989: California Department of Water Resources, Interagency Ecological Studies Program Technical Report 23, p. 61-66.

Webb, R.H., and Betancourt, J.L., 1990, The spatial and temporal distribution of radiocarbon ages from packrat middens, in Betancourt, J.L., Van Devender, T.R., and Martin, P.S. (editors), Fossil packrat middens: The last 40,000 years of biotic change: Tucson, Arizona, The University of Arizona Press, p. 85-102.

Nelson, D.J., Webb, R.H., and Long, Austin, 1990, Stick-nest rat (Leporillus: Muridae) middens from central Australia, in Betancourt, J.L., Van Devender, T.R., and Martin, P.S. (editors), Fossil packrat middens: The last 40,000 years of biotic change: Tucson, Arizona, The University of Arizona Press, p. 428-434.

Graf, J.B., Webb, R.H., and Hereford, Richard, 1991, Relation of sediment load and flood-plain formation to climatic variability, Paria River drainage basin, Utah and Arizona: Geological Society of America Bulletin, v. 103, p. 1405-1415.

 Gray, J.R., Webb, R.H., and Hyndman, D.W., 1991, Low-flow sediment transport in the Colorado River, in Fan, S.S., and Kuo, Y.H., editors, Proceedings of the Fifth Federal Interagency Sedimentation Conference, Volume 1: Washington, D.C., Federal Energy Regulatory Commission, p. 4-63 to 4-71.

Hyndman, D.W., Roberts, R.A., and Webb, R.H., 1991, Modeling sediment transport in an ephemeral river, in Fan, S.S., and Kuo, Y.H., editors, Proceedings of the Fifth Federal Interagency Sedimentation Conference, Volume 2: Washington, D.C., Federal Energy Regulatory Commission, p. 8-101 to 8-108.

Gray, J.R., and Webb, R.H., 1991, Radionuclides in the Puerco and lower Little Colorado River basins, New Mexico and Arizona, before 1987, in Gunderson, L.C.S., and Wanty, R.V., (editors), Field studies of radon in rocks, soils, and water: U.S. Geological Survey Bulletin 1971, p. 297-311.

Webb, R.H., Smith, S.S., and McCord, V.A.S., 1991, Historic channel change of Kanab Creek, southern Utah and northern Arizona: Grand Canyon Natural History Association Monograph Number 9, 91 p.

Webb, R.H., and Betancourt, J.L., 1992, Climatic variability and flood frequency of the Santa Cruz River, Pima County, Arizona: U.S. Geological Survey Water-Supply Paper 2379, 40 p.

Ely, L.L., Webb, R.H., and Enzel, Y., 1992, Accuracy of post-bomb 137Cs and 14C in dating fluvial deposits: Quaternary Research, v. 38, p. 196-204.

Hereford, Richard, and Webb, R.H., 1992, Historic variation in warm-season rainfall on the Colorado Plateau, U.S.A.: Climatic Change, v. 22, p. 239-256.

Cayan, D.R., and Webb, R.H., 1992, El Niño/Southern Oscillation and streamflow in the western United States, in Diaz, H.F., and Markgraf, V., (editors), El Niño, Historical and paleoclimatic aspects of the Southern Oscillation: Cambridge, England, Cambridge University Press, p. 29-68.

Enzel, Yehouda, Ely, L.L., House, P.K., Baker, V.R., and Webb, R.H., 1993, Paleoflood evidence for a natural upper bound to flood magnitudes in the Colorado River basin: Water Resources Research, v. 29, p. 2287-2297.

Webb, R.H., and Bowers, J.E., 1993, Changes in frost frequency and desert vegetation assemblages in Grand Canyon, Arizona, in Redmond, K.T., (editor), Proceedings of the Ninth Annual Pacific Climate (PACLIM) Workshop, April 21-24, 1992: California Department of Water Resources, Interagency Ecological Studies Program Technical Report 34, p. 71-82.

Melis, T.S., and Webb, R.H., 1993, Debris flows in Grand Canyon National Park, Arizona — Magnitude, frequency and effects on the Colorado River, in Shen, H.W., Su, S.T., and Wen, F., (editors), Hydraulic Engineering ‘93: New York, American Society of Civil Engineers, Proceedings of the ASCE Conference, San Francisco, California, p. 1290-1295.

Webb, R.H., and Bowers, J.E., 1993, Plant demography and burro grazing in Grand Canyon, in Young, D.D., (editor), Vegetation management of hot desert rangeland ecosystems: Tucson, Arizona, University of Arizona, School of Renewable Natural Resources, p. 210-222.

Wohl, E.E., Webb, R.H., Baker, V.R., and Pickup, G., 1994, Sedimentary flood records in the bedrock canyons of rivers in the monsoonal region of Australia: Fort Collins, Colorado, Water Resources Papers no. 107, 102 p.

Melis, T.S., Webb, R.H., Griffiths, P.G, and Wise, T.J., 1994, Magnitude and frequency data for historic debris flows in Grand Canyon National Park and vicinity, Arizona: U.S. Geological Survey Water Resources Investigations Report 94-4214, 285 p.

Webb, R.H., and Melis, T.S., 1995, The 1995 debris flow at Lava Falls Rapid: Nature Notes, v. 11, p. 1-4.

Bowers, J.E., Webb, R.H., and Rondeau, R.J., 1995, Longevity, recruitment, and mortality of desert plants in Grand Canyon, Arizona, U.S.A.: Journal of Vegetation Science, v. 6, p. 551-564.

Schmidt, J.C., Grams, P.E., and Webb, R.H., 1995, Comparison of the magnitude of erosion along two large regulated rivers: Water Resources Bulletin, v. 31, p. 617-631.

Webb, R.H., 1996, Grand Canyon, a century of change: Tucson, University of Arizona Press, 320 p.

Melis, T.S., Phillips, W.M., Webb, R.H., and Bills, D.J., 1996, When the blue-green waters turn red — Historical flooding in Havasu Creek, Arizona: U.S. Geological Survey Water-Resources Investigations Report 96-4059, 136 p.

Webb, R.H., Melis, T.S., and Wise, T.W., 1996, “The great cataract,” Effects of late Holocene debris flows on Lava Falls Rapid, Grand Canyon National Park, Arizona:  U.S. Geological Survey Open-file Report 96-460, 96 p.

Griffiths, P.G., Webb, R.H., and Melis, T.S., 1996, Initiation and frequency of debris flows in Grand Canyon, Arizona: U.S. Geological Survey Open-File Report 96-491, 35 p.

Salzer, M.W., McCord, V.A.S., Stevens, L.E., and Webb, R.H., 1996, The dendrochronology of netleaf hackberry (Celtis reticulata Torr.) in Grand Canyon — Assessing the impact of regulated river flow on tree growth, in Dean, J.S., Meko, D.M., and Swetnam, T.W. (editors), Tree rings, environment and humanity: Radiocarbon, p. 273-281.

Collier, Michael, Webb, R.H., and Schmidt, J.C., 1996, Dams and rivers, A primer on the downstream effects of dams:  U.S. Geological Survey Circular 1126, 94 p.

Collier, M.P., Webb, R.H., and Andrews, E.D., 1997, Experimental flooding in Grand Canyon: Scientific American, v. 276, p. 82-89.

Webb, R.H., Melis, T.S., Griffiths, P.G., and Elliott, J.G., 1997, Reworking of aggraded debris fans by the 1996 controlled flood on the Colorado River in Grand Canyon National Park, Arizona: U.S. Geological Survey Open-file Report 97-16, 40 p.

Bowers, J.E., Webb, R.H., and Pierson, E.A., 1997, Succession of desert plants on debris-flow terraces, Grand Canyon, Arizona, U.S.A.: Journal of Arid Environments, v. 36, p. 67-86.

Griffiths, P.G., Webb, R.H., and Melis, T.S., 1997, Initiation of debris flows in bedrock canyons of the Colorado River, USA, in Chen, Cheng-lung (editor), Debris-flow hazards mitigation: Mechanics, prediction, and assessment: New York, American Society of Civil Engineers, p. 12-20.

Melis, T.S., Webb, R.H., and Griffiths, P.G., 1997, Debris flows in Grand Canyon National Park: Peak discharges, flow transformations, and hydrographs, in Chen, Cheng-lung (editor), Debris-flow hazards mitigation: Mechanics, prediction, and assessment: New York, American Society of Civil Engineers, p. 727-736.

Webb, R.H., and Hasbargen, J., 1998, Floods, groundwater levels, and arroyo formation on the Escalante River, south-central Utah, in Learning from the Land: Proceedings of the Grand Staircase - Escalante National Monument, November 1-5, 1995, p. 49-59.

Schmidt, J.C., Webb, R.H., Valdez, R.A., Marzolf, G.R., and Stevens, L.E., 1998, The roles of science and values in river restoration in Grand Canyon: Bioscience, v. 48, no. 9, 735-747.

Marzolf, G.R., Valdez, R.A., Schmidt, J.C., and Webb, R.H., 1998, Perspectives on river restoration in the Grand Canyon: Bulletin of the Ecological Society of America, v. 79, no. 4, p. 250-254.

Reilly, P.T., 1999, Lee’s Ferry, from Mormon Crossing to National Park (edited by R.H. Webb): Logan, Utah State University Press, 542 p.

Cerling, T.E., Webb, R.H., Poreda, R.J., Rigby, A.D., and Melis, T.S., 1999, Cosmogenic 3He ages and frequency of late Holocene debris flows from Prospect Canyon, Grand Canyon, U.S.A.: Geomorphology, v. 27, p. 93-111.

Webb, R.H., Griffiths, P.G., Melis, T.S., Elliott, J.G., and Pizzuto, J.E., 1999, Reworking of debris fans by the 1996 controlled flood in Grand Canyon, in Webb, R.H., Schmidt, J.C., Valdez, R.A., and Marzolf, G.R., The 1996 flood in Grand Canyon: Scientific experiment and management demonstration: Washington, D.C. American Geophysical Union, Geophysical Monograph, p. 37-51.

Pizzuto, J.E., Webb, R.H., Griffiths, P.G., Elliott, J.G, and Melis, T.S., 1999, Entrainment and transport of cobbles and boulders from debris fans, in Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A., The controlled flood in Grand Canyon: Scientific experiment and management demonstration: Washington, D.C. American Geophysical Union, Geophysical Monograph 110, p. 53-70.

Webb, R.H., Wegner, D.L., Andrews, E.D., Valdez, R.A., and Patten, D.T., 1999, Downstream effects of Glen Canyon Dam on the Colorado River in Grand Canyon: A review, in Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A., The controlled flood in Grand Canyon: Scientific experiment and management demonstration: Washington, D.C. American Geophysical Union, Geophysical Monograph 110, p. 1-21.

Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A. (editors), 1999, The controlled flood in Grand Canyon: Scientific experiment and management demonstration: Washington, D.C. American Geophysical Union, Geophysical Monograph 110, 367 p.

Webb, R.H., Melis, T.S., Griffiths, P.G., Elliott, J.G., Cerling, T.E., Poreda, R.J, Wise, T.W, and Pizzuto, J.E., 1999, Lava Falls Rapid in Grand Canyon, Effects of late Holocene debris flows on the Colorado River: U.S. Geological Survey Professional Paper 1591, 90 p.

Wilson, T.B., Webb, R.H., and Thompson, T.L., 1999, Fire frequency and soil nutrient status on the Southern Gunnery Ranges at Fort Huachuca Military Reservation, Arizona, in Gottfried, G.J., Eskew, L.G., Curtin, C.G., and Edminster, C.B. (compilers), Toward integrated research, land management, and ecosystem protection in the Malpai Borderlands: Conference Summary, 6-8 January 1999, Douglas, Arizona: Fort Collins, Colorado, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Proceedings RMRS-P-10, p. 81-82.

Biggs, T.H., Webb, R.H., and Quade, J., 1999, Fire frequency and spatial variability of soil biogeochemistry and plant biochemistry in a southeastern Arizona desert grassland, in Gottfried, G.J., Eskew, L.G., Curtin, C.G., and Edminster, C.B. (compilers), Toward integrated research, land management, and ecosystem protection in the Malpai Borderlands: Conference Summary, 6-8 January 1999, Douglas, Arizona: Fort Collins, Colorado, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Proceedings RMRS-P-10, p. 77-80.

Webb, R.H., Griffiths, P.G., Melis, T.S., and Hartley, D.R., 2000, Sediment delivery by ungaged tributaries of the Colorado River in Grand Canyon: U.S. Geological Survey Water Resources Investigations Report 00-4055, 67 p.

Steiger, J.W., and Webb, R.H., 2000, Recovery of perennial vegetation in military target sites in the eastern Mojave Desert, Arizona: U.S. Geological Survey Open-File Report OF 00-355, 28 p.

Webb, R.H., Griffiths, P.G., and Hartley, D.R., 2001, Techniques for estimating sediment yield of ungaged tributaries on the southern Colorado Plateau: Reno, Nevada, Proceedings of the Seventh Federal Interagency Sedimentation Conference, p. I-24 to I-31.

Webb, R.H., and Hereford, R., 2001, Floods and geomorphic change in the southwestern United States: An historical perspective: Reno, Nevada, 7th Federal Interagency Sedimentation Conference Proceedings, p. IV-30 to IV-37.

Webb, R.H., and Griffiths, P.G., 2001, Sediment delivery by ungaged tributaries of the Colorado River in Grand Canyon, U.S. Geological Survey Fact Sheet FS-018-01, 4 p.

Webb, R.H., and Griffiths, P.G., 2001, Monitoring of coarse sediment inputs to the Colorado River in Grand Canyon, U.S. Geological Survey Fact Sheet FS-019-01, 4 p.

Webb, R.H., Esque, T.C., Medica, P.A., DeFalco, L.A., and Murov, M.A., 2001, Monitoring of ecosystem dynamics in the Mojave Desert: the Beatley permanent data, U.S. Geological Survey Fact Sheet FS-040-01, 4 p.

Webb, R.H., Boyer, D.E., and Berry, K.H., 2001, Changes in riparian vegetation in the southwestern United States: Historical changes along the Mojave River, California: U.S. Geological Survey Open-File Report OF 01-245, 1 sheet.

Webb, R.H., Boyer, D.E., Orchard, K.L, and Baker, V.R.., 2001, Changes in riparian vegetation in the southwestern United States: Floods and riparian vegetation on the San Juan River, southeastern Utah: U.S. Geological Survey Open-File Report OF 01-314, 1 sheet.

Webb, R.H., and Boyer, D.E., 2001, Changes in riparian vegetation in the southwestern United States: Historical changes at gaging stations in Arizona: U.S. Geological Survey Open-File Report OF 01-323, 1 sheet.

Wilson, T.B., Webb, R.H., and Thompson, T.L., 2001, Mechanisms of range expansion and removal of mesquite (Prosopis spp.) in desert grasslands in the southwestern United States: Tempe, Arizona, U.S. Forest Service, General Technical Report 01-37, 23 p.

Fenton, C.R., Webb, R.H., Pearthree, P.A., Cerling, T.E., and Poreda, R.J., 2001, Displacement rates on the Toroweap and Hurricane faults: implications for Quaternary downcutting in Grand Canyon, Arizona: Geology, v. 29, no. 11, p.  1035-1038.

House, P.K., Webb, R.H., Baker, V.R., and Levish, D.R. (eds.), 2001, Ancient floods, modern hazards, principles and applications of paleoflood hydrology: Washington, DC, American Geophysical Union, Water Science and Application Series, v. 5, 385 p.

Webb, R.H., Blainey, J.B., and Hyndman, D.W., 2001, Paleoflood hydrology of the Paria River, southern Utah and northern Arizona, USA, in House, P.K., Webb, R.H., Baker, V.R., and Levish, D.R., Ancient floods, modern hazards, principles and applications of paleoflood hydrology: Washington, DC, American Geophysical Union, Water Science and Application Series, v. 5, p. 295-310.

Blainey, J.B., Webb, R.H., Moss, M.E., and Baker, V.R., 2001, Bias and information content of paleoflood data in flood-frequency analysis, in House, P.K., Webb, R.H., Baker, V.R., and Levish, D.R., Ancient floods, modern hazards, principles and applications of paleoflood hydrology: Washington, DC, American Geophysical Union, Water Science and Application Series, v. 5, p. 161-174.

Webb, R.H., and Jarrett, R.D., 2001,One-dimensional estimation techniques for discharges of paleofloods and historical floods, in House, P.K., Webb, R.H., Baker, V.R., and Levish, D.R., Ancient floods, modern hazards, principles and applications of paleoflood hydrology: Washington, DC, American Geophysical Union, Water Science and Application Series, v. 5, 111-125.

Fenton, C.R., Webb, R.H., Cerling, T.E., Poreda, R.J., and Nash, B.P., 2001, Cosmogenic 3He ages and geochemical discrimination of lava-dam outburst-flood deposits in western Grand Canyon, Arizona, in House, P.K., Webb, R.H., Baker, V.R., and Levish, D.R., Ancient floods, modern hazards, principles and applications of paleoflood hydrology: Washington, DC, American Geophysical Union, Water Science and Application Series, v. 5, p. 191-215.

Baker, V.R., Webb, R.H., and House, P.K., 2001, The scientific and societal value of paleoflood hydrology, in House, P.K., Webb, R.H., Baker, V.R., and Levish, D.R., Ancient floods and modern hazards, principles and applications of paleoflood hydrology: Washington, DC, American Geophysical Union, Water Science and Application Series, v. 4, 1-19.

Schmidt, K.M., and Webb, R.H., 2001, Researchers consider U.S. Southwest’s response to warmer, drier conditions: EOS, v. 82, no. 41, p. 475, 478.

Fenton, C.R., Webb, R.H., Pearthree, P.A., Cerling, T.E., Poreda, R.J., and Nash, B.P., 2002, Cosmogenic 3He dating of western Grand Canyon basalts: Implications for Quaternary incision of the Colorado River, in Young, R.A., and Spamer, E.E. (eds.), The Colorado River: Origin and evolution: Grand Canyon, Arizona, Grand Canyon Association Monograph 12, p. 147-152.

Webb, R.H., Griffiths, P.G., and Melis, T.S., 2002, Debris flows and rapids in Grand Canyon: Implications for erosion rates and evacuation of sediment from tributary canyons, in Young, R.A., and Spamer, E.E. (eds.), The Colorado River: Origin and evolution: Grand Canyon, Arizona, Grand Canyon Association Monograph 12, p. 183-188.

Webb, R.H., Melis, T.S., and Valdez, R.A., 2002, Observations of environmental change in Grand Canyon: U.S. Geological Survey Water Resources Investigations Report 02-4080, 33 p.

Collier, M., and Webb, R.H., 2002, Floods, droughts, and climate change: Tucson, University of Arizona Press, 153 p.

Webb, R.H., 2002, Recovery of severely compacted soils in the Mojave Desert, California, USA: Arid Lands Research and Management, v. 16, p. 291-305.

Biggs, T.H., Quade, J., and Webb, R.H., 2002,  d13C of soil organic matter in semidesert grassland with mesquite (Prosopis) encroachment in southeastern Arizona: Geoderma, v. 110, p. 109-130.

Griffiths, P.G., Webb, R.H., Lancaster, N., Kaehler, C.A., and Lundstrom, S.C., 2002, Long-term sand supply to Coachella Valley fringe-toed lizard (Uma inornata) habitat in the northern Coachella Valley, California: U.S. Geological Survey Water-Resources Investigations Report 02-4013, 49 p.

Hereford, R., Webb, R.H., and Graham, S., 2002, Precipitation history of the Colorado Plateau region, 1900-2000: U.S. Geological Survey Fact Sheet 119-02, 4 p.

Webb, R.H., Melis, T.S., and Griffiths, P.G., 2003, Debris flows and the Colorado River, in Beus, S.S., and Morales, M., Grand Canyon Geology, 2nd edition: New York, Oxford University Press, p. 371-390.

Turner, R.M., Webb, R.H., and Bowers, J.E., 2003, The changing mile revisited: Tucson, University of Arizona Press, 334 p.

Webb, R.H., Murov, M.B., Esque, T.C., Boyer, D.E., DeFalco, L.A., Haines, D.F., Oldershaw, D., Scoles, S.J., Thomas, K.A., Blainey, J.B., and Medica, P.A., 2003, Perennial vegetation data from permanent plots on the Nevada Test Site, Nye County, Nevada: U.S. Geological Survey Open-File Report 03-336, 251 p.

Webb, R.H., and Thomas, K.A., 2003, Recoverability of severely disturbed soils and vegetation in the Mojave Desert, California, USA, in Alsharhan, A.S., Wood, W.W., Goudie, A.S., Fowler, A., and Abdellatif, E.M. (eds.), Desertification in the Third Millennium: The Netherlands, Swets & Zeitlinger (Balkema) Publishers, p. 283-290.

Fenton, C.R., Poreda, R.J., Nash, B.P., Webb, R.H., and Cerling, T.E., 2004, Geochemical discrimination of five Pleistocene lava-dam outburst-flood deposits, Grand Canyon: Journal of Geology, v. 112, p. 91-110.

Fenton, C.R., Webb, R.H., Pearthree, P.A., Cerling, T.E., Poreda, R.J., and Nash, B.P., 2004, Cosmogenic 3He dating of western Grand Canyon basalts: Implications for Quaternary incision of the Colorado River, in Young, R.A., and Spamer, E.E. (eds.), 2001, The Colorado River: Origin and evolution: Grand Canyon, Arizona, Grand Canyon Association Monograph 12, p. 147-152.

Webb, R.H., Griffiths, P.G., and Melis, T.S., 2004, Debris flows and rapids in Grand Canyon: Implications for erosion rates and evacuation of sediment from tributary canyons, in Young, R.A., and Spamer, E.E. (eds.), 2001, The Colorado River: Origin and evolution: Grand Canyon, Arizona, Grand Canyon Association Monograph 12, p. 183-188.

Hereford, R., 2004, Map showing Quaternary geology and geomorphology of the Lonely Dell Reach of the Paria River, Lees Ferry, Arizona, with accompanying pamphlet, Webb, R.H., and Hereford, R., Comparative landscape photographs of the Lonely Dell area and the mouth of the Paria River: Geologic Investigations Series Map I-2771, scale 1:5,000. [available on the World Wide Web at http://pubs.usgs.gov/imap/i2771/].

Webb, R.H., Belnap, J., and Weisheit, J., 2004, Cataract Canyon: A human and environmental history: Salt Lake City, University of Utah Press, 268 p.

Griffiths, P.G., Webb, R.H., and Melis, T.S., 2004, Frequency and initiation of debris flows in Grand Canyon, Arizona: Journal of Geophysical Research, Surface Processes, v. 109, F04002, doi:10.1029/2003JF000077, 14 p.

Webb, R.H., and Turner, R.M., 2004, Climate and vegetation change in the Sonoran Desert: Sonorensis, v. 24, p. 16-19.

Bullock, S.H., Martijena, N.E., Webb, R.H., and Turner, R.M., 2005, Twentieth century demographic changes in cirio and cardón in Baja California: Journal of Biogeography, v. 32, p. 127-143.

Magirl, C.S., Webb, R.H., and Griffiths, P.G., 2005, Changes in the water surface profile of the Colorado River in Grand Canyon, Arizona, between 1923 and 2000: Water Resources Research, v. 41, Wo5021, doi:10.1029/2003WR002519, 10 p.

Webb, R.H., Hereford, Richard, and McCabe, G.J., 2005, Climatic fluctuations, drought, and flow in the Colorado River, in Gloss, S.P., Lovich, J.E., and Melis, T.S. (eds.), The State of the Colorado River Ecosystem in Grand Canyon: U.S. Geological Survey Circular 1282, p. 59-69.

Webb, R.H., Griffiths, P.G., Magirl, C.S., and Hanks, T.C., 2005, Debris flows in Grand Canyon and the rapids of the Colorado River, in Gloss, S.P., Lovich, J.E., and Melis, T.S. (eds.), The State of the Colorado River Ecosystem in Grand Canyon: U.S. Geological Survey Circular 1282, p. 119-132.

Griffiths, P.G., Hereford, R., and Webb, R.H., 2006, Sediment yield and runoff frequency of small drainage basins in the Mojave Desert: Geomorphology, v. 74, p. 232-244.

Griffiths, P.G., Hereford, R., and Webb, R.H., 2006, Sediment yield and runoff frequency of small drainage basins in the Mojave Desert, California and Nevada: U.S. Geological Survey Fact Sheet 2006-3007, 4 p.

Fenton, C.F., Webb, R.H., and Cerling, T.E., 2006, Peak discharge estimates of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA: Quaternary Research, v. 65, p. 324-335.

Webb, R.H., 2006, A Grand Enigma, Book Review: Grand Canyon: Solving the Earth’s Grandest Puzzle by James Lawrence Powell: American Scientist, v. 94, p. 183-184.

Webb, R.H., and Leake, S.A., 2006, Ground-water surface-water interactions and long-term change in riverine riparian vegetation in the southwestern United States: Journal of Hydrology, v. 320, p. 302-323, doi:10.1016/j.jhydrol.2005.07.022.

Magirl, C.S., Griffiths, P.G., and Webb, R.H., 2006, ADV point measurements within rapids of the Colorado River in Grand Canyon, in Graham, R. (editor), Examining the Confluence of Environmental and Water Concerns,  Proceedings of the 2006 World Environmental and Water Resources Congress, Omaha, Nebraska, May 21-25, 2006: Reston, Virginia, American Society of Civil Engineers Publication, 10 p.

Hanks, T.C., and Webb, R.H., 2006, Effects of tributary debris on the longitudinal profile of the Colorado River in Grand Canyon: Journal of Geophysical Research, Earth Surface, v. 111, F02020, doi:10.1029/2004JF000257.

Yanites, B.J., Webb, R.H., Griffiths, P.G., and Magirl, C.S., 2006, Debris-flow deposition and reworking by the Colorado River in Grand Canyon, Arizona: Water Resources Research, v. 42, W11411, doi:10.1029/2005WR004847.

Hereford, R., Webb, R.H., and Longprẻ, C., 2006, Precipitation history and ecosystem response to multidecadal precipitation variability in the Mojave Desert and vicinity, 1893–2001: Journal of Arid Environments, v. 67, p. 13-34.

Webb, R.H., Leake, S.A., and Turner, R.M., 2007, The ribbon of green: Change in riparian vegetation in the southwestern United States: Tucson, University of Arizona Press, 452 p.

Magirl, C.S., Shoemaker, C., Webb, R.H., Schaffner, M., Griffiths, P.G., and Pytlak, E., 2007, Debris flows and record floods from extreme mesoscale convective thunderstorms over the Santa Catalina Mountains, Arizona: U.S. Geological Survey Open-File Report 2007-1108, 1 sheet.

Magirl, C.S., Webb, R.H., Schaffner, M., Lyon, S.W., Griffiths, P.G., Shoemaker, C., Unkrich, C.L., Yatheendradas, S., Troch, P.A., Pytlak, E., Goodrich, D.C., Desilets, S.L.E., Youberg, A., and Pearthree, P.A., 2007, Impact of recent extreme Arizona storms: EOS, v. 88, no. 17, pp. 191, 193.

Boyer, D.E., and Webb, R.H., 2007, Damming Grand Canyon: The 1923 U.S. Geological Survey Colorado River Expedition: Logan, Utah State University Press, 289 p.

Webb, R.H., Griffiths, P.G., Wallace, C.S.A., and Boyer, D.E., 2007, Channel response to low-elevation desert fire: the King Valley Fire of 2005: U.S. Geological Survey Data Report DS 275, 52 p.

Webb, R.H., Boyer, D.E., and Turner, R.M., 2007, The Desert Laboratory Repeat Photography Collection—An Invaluable Archive Documenting Landscape Change: U.S. Geological Survey Fact Sheet 2007-3046, 4 p.

Blainey, J.B., Webb, R.H., and Magirl, C.S., 2007, Modeling the spatial and temporal variation of monthly and seasonal precipitation on the Nevada Test Site, 1960-2006: U.S. Geological Survey Open-file Report 2007-1269, 40 p.

Magirl, C.S., Smart, G.M., Gartner, J.W., and Webb, R.H., 2007, Techniques and instrumentation for measuring flow in high-gradient rivers, in Proceedings of the 2007 EWRI-ASCE/IAHR Hydraulic Measurements & Experimental Methods Conference, Lake Placid, New York, September 10-12, 2007: Reston, Virginia, American Society of Civil Engineers Publication, pp. 454-459.

Wallace, C.S.A., Webb, R.H., and Thomas, K.A., 2007, Estimation of perennial vegetation cover distribution in the Mojave Desert using MODIS-EVI data: GIScience and Remote Sensing, v. 45, p. 167-187. DOI: 10.2747/1548-1603.45.2.1.

Magirl, C.S., Breedlove, M.J., Webb, R.H., and Griffiths, P.G., 2008, Modeling water-surface elevations and virtual shorelines for the Colorado River in Grand Canyon, Arizona: U.S. Geological Survey Scientific Investigation Report 2008-5075, 32 p.

Webb, R.H., Griffiths, P.G., and Rudd, L.P., 2008, Holocene debris flows on the Colorado Plateau: The influence of clay mineralogy and chemistry: Geological Society of America Bulletin, v. 120, p. 1010-1020.

Belnap, J., Webb, R.H., Miller, M.E., Miller, D.M., DeFalco, L.A., Medica, P.A., Brooks, M.L., Esque, T.C., and Bedford, D., 2008, Monitoring ecosystem quality and function in arid settings of the Mojave Desert: U.S. Geological Survey Scientific Investigations Report, 2009-5064, 120 p. http://pubs.usgs.gov/sir/2008/5064/

Webb, R.H., Belnap, J., and Thomas, K.A., 2009,  Natural recovery from severe disturbance in the Mojave Desert, in Webb, R.H., Fenstermaker, L.F., Heaton, J.S., Hughson, D.L., McDonald, E.V., and Miller D.M. (editors), The Mojave Desert: Ecosystem Processes and Sustainability: Reno, University of Nevada Press, in press.

Webb, R.H., DeFalco, L.A., Esque, T.C., and Medica, P.A., 2009, A review of selected long-term ecological studies of the Mojave Desert, in Webb, R.H., Fenstermaker, L.F., Heaton, J.S., Hughson, D.L., McDonald, E.V., and Miller D.M. (editors), The Mojave Desert: Ecosystem Processes and Sustainability: Reno, University of Nevada Press, in press.

Webb, R.H., Fenstermaker, L.F., Heaton, J.S., Hughson, D.L., McDonald, E.V., and Miller D.M. (editors), 2009, The Mojave Desert: Ecosystem Processes and Sustainability: Reno, University of Nevada Press, in press.

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