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Robert Stallard

Hydrologist

Contact Info


Short Biography

Robert Stallard has worked as a scientist in the National Research Program of Water Mission Area since 1987. He studies how land-cover and climate change affect water movement through soils, weathering, and erosion, and how these, in turn, affect the composition and dispersal of dissolved and solid phases in rivers and trace gases in the atmosphere. Areas of expertise include surface-water hydrology, major element and nutrient biogeochemistry, soil formation and sediment genesis, vegetation-landscape interaction, carbon-cycle characterization on land and in the ocean, and assessment of land-use and climate change. His work has included the study of natural and human-altered landscapes, in the Americas, Southeast Asia, and Africa, including large parts of the Amazon, Orinoco, Mississippi, and Panama Canal Basins and eastern Puerto Rico.



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Publications

Murphy, S.F., and Stallard, R.F., 2012, Hydrology and climate of four watersheds in eastern Puerto Rico—Chapter C, in Murphy, S.F. , and Stallard, R.F., Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789–C, p. 43-84. [Link]

Murphy, S.F., and Stallard, R.F., 2012, Methods used to analyze water quality of four watersheds in eastern Puerto Rico— Appendix 2, in Murphy, S.F., and Stallard, R.F. , Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789, p. 289-292. [Link]

Murphy, S.F., Stallard, R.F., Larsen, M.C., and Gould, W.A., 2012, Physiography, geology, and land cover of four watersheds in eastern Puerto Rico—Chapter A, in Murphy, S.F., and Stallard, R.F., Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789–A, p. 1-23. [Link]

Stallard, R.F., 2012, Atmospheric inputs to watersheds of the Luquillo Mountains in eastern Puerto Rico—Chapter D, in Murphy, S.F., and Stallard, R.F., Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789–D, p. 85-112. [Link]

Stallard, R.F., 2012, Data processing and computation to characterize hydrology and compare water quality of four watersheds in Puerto Rico— Appendix 1, in Murphy, S.F., and Stallard, R.F., Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789, p. 263-287. [Link]

Stallard, R.F., 2012, Weathering, landscape equilibrium, and carbon in four watersheds in eastern Puerto Rico—Chapter H, in Murphy, S.F., and Stallard, R.F. , Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789–H, p. 199-248. [Link]

Stallard, R.F., and Murphy, S.F., 2012, Water quality and mass transport in four watersheds in eastern Puerto Rico—Chapter E, in Murphy, S.F., and Stallard, R.F., Editors, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, USGS Professional Paper 1789–E, p. 113-152. [Link]

Murphy, S.F., and Stallard, R.F., 2012, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, Professional Paper 1789, 292 p. [Link]

Murphy, S.F., and Stallard, R.F., 2012, Water quality and landscape processes of four watersheds in eastern Puerto Rico: Reston, VA, U. S. Geological Survey, Professional Paper 1789, 292 p.— Instructions for downloading data from the National Water Information System (NWIS). [Download File]

Shanley, J.B., McDowell, W.H., and Stallard, R.F., 2011, Long-term patterns and short-term dynamics of stream solutes and suspended sediment in a rapidly weathering tropical watershed: Water Resources Research, v. 47, no. W07515, p. 1-11.

Stallard, R.F., Ogden, F.L., Elsenbeer, H., and Hall, J., 2010, Panama Canal Watershed Experiment: Agua Salud Project: Water Resources Impact, v. 12, no. 4, p. 17-20.

Ackerman, Katherine V.; Mixon, David M.; Sundquist, Eric T.; Stallard, Robert F.; Schwarz, Gregory E.; Stewart, David W., 2009. RESIS-II: An Updated Version of the Original Reservoir Sedimentation Survey Information System (RESIS) Database. U.S. Geological Survey Data Series 434, Report: iv, 22 p.; Database (mdb) [Link]

Barthold, F.K., Stallard, R.F., and Elsenbeer, H., 2008, Soil Nutrient-Landscape Relationships in a Lowland Tropical Rainforest in Panama: Forest Ecology and Management, v. 255, no. 3-4, p. 1135-1148.

Harden, J.W., Berhe, A.A., Torn, M., Harte, J., Liu, S., and Stallard, R.F., 2008, Soil erosion: Data say C sink: Science, v. 320, no. 5873, p. 178-179.

Mixon, D. M., Kinner, D. A., Stallard, R. F., and Syvitski, J. P. M., 2008, Geolocation of man-made reservoirs across terrains of varying complexity using GIS: Computers & Geosciences: Computers & Geosciences, v. 34, no. 10, p. 1184-1197.

John, R., Dalling, J.W., Harms, K.E., Yavitt, J. B.; Stallard, R. F., Mirabello, M., Hubbell, S. P.; Valencia, R., Navarrete, H., Vallejo, M., and Foster, R. B., 2007, Soil nutrients influence spatial distributions of tropical tree species: Proceedings of the National Academy of Sciences of the United States, v. 104, no. 3, p. 864-869.

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., 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.

Svenning, J.-C., Engelbrecht, B.M.J., Kinner, D.A., Kursar, T. A., Stallard, R. F., and Wright, S. J., 2006, The relative roles of environment, history, and local dispersal in controlling the distributions of common tree and shrub species in a tropical forest landscape, Panama: Journal of Tropical Ecology, v. 22, p. 575-586.

Kinner, D.A., Mitasova, H., Stallard, R.F., Harmon, R.S., and Toma, L., 2005, GIS-Based stream and network analysis for the upper Río Chagres Basin, Panama, in Harmon, R.S., editor, The Río Chagres, Panama: A Multidisciplinary Profile of a Tropical Watershed: Dordtrecht, The Netherlands, Springer, Water Science and Technology Library 52, p. 83-95.

Denning, S., Cook, R.B., Dilling, L., Doney, S., Heath, L., McGuire, D., McKee, B., Sabine, C., Oren, R., Paustian, K., Randerson, J., Reilly, L., Running, S., Stallard, R.F., Torn, M., and Wofsy, S., 2004, Science Implementation Strategy for the North American Carbon Program: National Science Foundation, Arlington, VA., 80p.

Godsey, S., H. Elsenbeer, and R.F. Stallard, 2004. Overland flow generation in two lithologically-distinct rainforest catchments, Barro Colorado Island, Panama, Journal of Hydrology, v. 295, p. 276-290.

Kinner, D.A., and Stallard, R.F., 2004, Identifying storm-flow pathways in a rainforest catchment using hydrological and geochemical modelling: Hydrological Processes, v. 18, p. 2851-2875.

Svenning, J.-C., Kinner, D.A., Stallard, R.F., Engelbrecht, B., and Wright, S.J., 2004, Determinism in plant community structure across a tropical forest landscape: Ecology, v. 85, p. 2526-2538.

Ibáñez D., R., Condit, R., Angehr, G.R., Aguilar, S., García, T., Martínez, R., Sanjur, A., Stallard R.F., Wright S.J., Rand A.S., Heckadon Moreno S., 2002, An ecosystem report on the Panama Canal: Monitoring the status of the forest communities and the watershed: Environmental Monitoring and Assessment, v. 80, p. 65-95.

Condit, R., Robinson, W.D., Ibáñez D., R., Aguilar, S., Sanjur, A., Martínez, R., Stallard, R.F., García, T., Angehr, G.R., Petit, L., Wright, S.J., Robinson, T.R., and Heckadon M., S., 2001, The status of the Panama Canal Watershed and Its biodiversity at the beginning of the 21st Century: Bioscience, v. 51, no. 5, p. 389-398.

Pacala, S.W., Hurtt, G.C., Baker, D., Peylin, P., Houghton, R.A., Birdsey, R.A., Heath, L., Sundquist, E.T., Stallard, R.F., Ciais, P., Moorcroft, P., Caspersen, J.P., Shevliakova, E., Moore, B., Kohlmaier, G., Holland, E., Gloor, M., Harmon, M.E., Fan, S.-M., Sarmiento, J.L., Goodale, C.L., Schimel, D., and Field C.B., 2001, Consistent land- and atmosphere-based U.S. carbon sink estimates: Science, v. 292, no. 5525, p. 2316-2320.

Stallard, R.F., 2001, Possible environmental factors underlying amphibian decline in eastern Puerto Rico: Analysis of government data archives: Conservation Biology, v. 15, no. 4, p. 1-16.

Stallard, R.F., Mixon, D.A., Kinner, D.A., and Worstell, B., 2001, RESIS-II: Making the Reservoir Survey Information System complete and user friendly, in Proceedings of the Seventh Federal Interagency Sedimentation Conference, March 25 to 29, 2001, Reno, Nevada: Subcommittee on Sedimentation, Interagency Advisory Committee on Water Data, Washington, DC, p. IX-9 - IX-11.

Larsen, Matthew C.; Stallard, Robert F., 2000. Luquillo Mountains, Puerto Rico: A Water, Energy, and Biogeochemical Budgets Program Site. U.S. Geological Survey, Fact Sheet 163-99, 1 folded sheet ([4] p.) : col. ill., col. map ; 28 cm. col. ill., col. map ; [Link]

Stallard, R.F. 2000, Tectonic processes and erosion, in Jacobson, M.C., Charleson, R.J., Rodhe, H., and Orians, G.H., editors, Earth System Science: From Biogeochemical Cycles to Global Change: San Diego, California, Academic Press. p. 195-229.

Sundquist, E. T.; Stallard, R. F.; Bliss, N. B.; Markewich, H. W.; Harden, J. W.; Pavich, M. J.; Dean, M. D., Jr. , 1998. Mississippi Basin Carbon Project science plan. U.S. Dept. of the Interior, U.S. Geological Survey, Open-File Report 98-177, 44 p. [Link]

Brown, E. T., Stallard, R. F., Larsen, M. C., Bourlès, D. L., Raisbeck, G. M., and Yiou, F., 1998, Determination of predevelopment denudation rates of an agricultural watershed (Cayaguás River, Puerto Rico) using in situ-produced 10Be in river-borne quartz: Earth and Planetary Sciences Letters, , v. 160, p. 723-728.

Markewich, Helaine W.; Bliss, Norman B.; Stallard, Robert F.; Sundquist, Eric T., 1997. Can the global carbon budget be balanced?. U.S. Geological Survey, Fact Sheet 137-97, [2] p. : col. ill., col. map ; 28 cm. col. ill., col. map [Link]

Goldstein, S.L., Arndt, N.T., and Stallard, R.F., 1997, The history of a continent from U-Pb ages of zircons from Orinoco River sand and Sm-Nd isotopes in Orinoco basin river sediments: Chemical Geology, v. 139, p. 271-286.

Axtmann, E. V., and Stallard, R. F., 1995, Chemical weathering in the South Cascade Glacier basin, comparison of subglacial and extra-glacial weathering, in Tonnessen, K. A., Williams, M. W., and Tranter, Martyn, eds., Biogeochemistry of Seasonally Snow-Covered Catchments: International Association of Hydrological Sciences Publication 228, p. 431-439.

Brown, E. T., Stallard, R. F., Larsen, M. C., Raisbeck, G. M., and Yiou, F., 1995, Denudation rates determined from the accumulation of in situ-produced 10Be in the Luquillo Experimental Forest, Puerto Rico: Earth and Planetary Science Letters, v. 129, p. 193-202.

Edmond, J. M., Palmer, M. R., Measures, C. I., Grant, B., and Stallard, R. F., 1995, The fluvial geochemistry and denudation rate of the Guayana Shield in Venezuela, Colombia, and Brazil: Geochimica et Cosmochimica Acta, v. 59, p. 3301-3325.

Stallard, R. F., 1995, Tectonic, environmental, and human aspects of weathering and erosion: A global review using a steady-state perspective: Annual Review of Earth and Planetary Sciences, v. 23, p. 11-39.

Stallard, R. F., 1995, Relating chemical and physical erosion: in White, A.F., and Brantley, S.L. eds., Chemical Weathering Rates of Silicate Minerals: Reviews in Mineralogy, v. 31, p.543-564.

Keller, M. and Stallard, R. F., 1994, Methane Emission by bubbling from Gatun Lake, Panama: Journal of Geophysical Research, v. 99, p. 8307-8318.

Larsen, M. C.; Collar, P. D.; Stallard, R. F., 1993. Research plan for the investigation of water, energy, and biogeochemical budgets in the Luquillo Mountains, Puerto Rico. U.S. Geological Survey ; Books and Open-File Reports Section [distributor], Open-File Report 92-150, v, 19 p. :ill., maps ;28 cm.

Edmond, J. M., Stallard, R. F., Craig, H., Craig, V., Weiss, R. F., and Coulter, G. W., 1993, Nutrient chemistry of the water column of Lake Tanganyika: Limnology and Oceanography, v. 34, p. 725-738.

Jewell, P. W., Stallard, R. F., and Mellor, G. L., 1993, Numerical studies of bottom shear stress and sediment distribution on the Amazon continental shelf: Journal of Sedimentary Petrology, v. 63, p. 734-745.






                           

My Science Topics


Science Topic
Subtopic
Ecology and Environmentbiodiversity
Ecology and Environmentecosystems
Ecology and Environmentforests
Ecology and Environmenthabitat alteration
Ecology and Environmentwetlands
Environmental Issuesdeforestation
Environmental Issueshuman impacts
Environmental Issuesland use change
Environmental Issuessurface water quality
Geologic Processeserosion
Geologic Processessedimentation
Geologic Processessoil chemistry
Geologic Processeswater chemistry
Hydrologic Processeshydrology
Hydrologic Processesrunoff
Hydrologic Processessediment transport
Natural Hazardsfires
Natural Hazardsfloods
Natural Hazardshurricanes
Natural Hazardslandslides
Oceans and Coastlinescoastal zones
Water Resourcesdrainage basins
Water Resourcesdroughts
Water Resourcesestuaries
Water Resourcesfloods
Water Resourceslakes
Water Resourcesstreamflow
Water Resourcessurface water quality
Water Resourceswater budget



My USGS Science Strategy Areas

Understanding Ecosystems & Predicting Ecosystems Change

The Role of Environment and Wildlife in Human Health

Climate Variability & Change

Water, Energy, and Biogeochemical Budgets (WEBB) research in Puerto Rico

Image of Current Focus for Water, Energy, and Biogeochemical Budgets (WEBB) research in Puerto Rico

Cover of the recently published USGS Professional Paper 1789 which summarizes and interprets data from the first fifteen years (1991-2005) of four-way paired watershed study in tropical landscapes. It was described in a USGS top story.


Large Storms and Mass Budgets

Image of Large Storms and Mass Budgets

In many humid, tropical settings, big storms are accompanied by exceptional physical erosion, abundant overland flow, and often landslide outbreaks. Automated river-water samplingáduring storms and post-storm observations aid ináthe characterization of the role of big storms in watershed mass budgets. Storm-relatedáphenomena affect the export of material from watersheds, especially of sediment, dissolved and solid organic carbon, and plant nutrients (nitrogen, phosphorus, and potassium). This landslide, from the headwaters of the Panama Canal watershed, developed during the La PurÝsima storm of December 7-9, 2010. Thisástorm caused so many landslides that the eroded sediment compromised the drinking-water supply of Panama City for many weeks.


Contact Information

Robert Stallard
3215 Marine Street, Suite E-127
Boulder, CO 80303
stallard@usgs.gov
303-541-3022
303-541-3084 - Fax
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