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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

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]

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]

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]

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]

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.

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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

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

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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