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Ecosystems Research

Roy C. Sidle

Scientific Interests: Fate and transport of contaminants in ecosystems; Catchment processes, including hydrology, sediments, and biogeochemistry; Scaling issues related to water, sediment, and nutrients; Landslide processes, prediction, and land use effects; Sustainable development; Preferential flow in soils; Hydrological and contaminant transport modeling; Natural hazards and environmental change; and Cumulative effects of land use on water quality and erosion processes

Biographical Information

Name: Roy C. Sidle
Title: Title 42 Supervisory Physical Scientist (Division Director)

Contact Info:

Ecosystems Research Division
National Exposure Research Laboratory
Environmental Protection Agency
960 College Station Road
Athens, Georgia 30605

Phone: 706-355-8001
email: sidle.roy@epa.gov


B.S., Hydrology, University of Arizona, 1970    
M.S., Soil Science/Water Quality University of Arizona, 1972
Ph.D., Soil Science/Civil Engineering/Hydrology, The Pennsylvania State University, 1976 

Professional Experience

Director, Ecosystems Research Division (Title 42 Supervisory Physical Scientist), US EPA, Office of Research & Development, Athens, GA, Feb 2011-present
Professor of Geology and Director of the Environmental Science Program, Appalachian State University, Boone, NC, Nov 2008-Feb 2011
Professor and Head of the Slope Conservation Section, Disaster Prevention Research Institute (DPRI), Kyoto University, Uji, Japan, Nov 2002-Nov 2008
Professor of Geography, National University of Singapore, July 2000-Nov 2002
Professor and FRBC Endowed Chair in Forest Hydrology, Forest Resources Management and Geography, University of British Columbia, Vancouver, Sept 1997-Aug 2000
Executive Officer (Program Leader), Land-Ocean Interactions in the Coastal Zone Project (LOICZ, an IGBP Core Project), Texel, The Netherlands, Dec 1996-Sept 1997
Senior Researcher, Geological Survey of Denmark and Greenland (GEUS), Dept. of Quaternary and Marine Geology, Copenhagen, Denmark, Apr 1995-Dec 1996
Project Leader/Principal Research Hydrologist, USDA Forest Service, Intermountain Research Station, Logan, UT, Oct 1986-Mar 1995
Research Soil Scientist/Hydrologist, USDA Forest Service, Pacific Northwest Forest & Range Experiment Station, Juneau, AK, May 1980-Oct 1986
Watershed Management Extension Specialist (Assistant Professor), Department of Forest Engineering, Oregon State University, Corvallis, OR, Sept 1978-May 1980
Research Soil Scientist, USDA Agricultural Research Service, Morgantown, WV, Sept 1976-Sept 1978
Research Assistant , Institute for Research on Land & Water Resources, Pennsylvania State University, University Park, PA, Nov 1972-Sept 1976
Hydrologist, Wright Water Engineers, Denver, CO, May 1972-Nov 1972

Selected Awards and Honors

Elected “Fellow” of American Geophysical Union, 2010
Pojar Award nomination by the Bulkley Valley Research Centre in British Columbia for co-authoring an outstanding paper related to natural resources and sustainability in Landslides, 2009
Editorial board member, Hydrologic Research Letters, Japanese Soc. Hydrology & Water Resour., 2008-present
Invited Editorial Board Member, Taiwan Journal of Forest Science, 2008-present
Associate Editor, Journal of Geophysical Research - Earth Surface, American Geophysical Union, 2007-2010
Invited Editorial Board Member, Sustainability Science, 2006-2009
Invited Editorial Board Member, Journal of the Japan Society of Erosion Control Engineering, 2006-present
Editor’s Citation for Excellence in Manuscript Review Award from J. Environmental Quality, 2006
Premier’s Award, Innovation 2005/06 Finalists, Debris fan research team, British Columbia, Canada
Associate Editor, Landslides, journal of the International Consortium on landslides, 2003-continuing
Guest Editor, special issue of Hydrological Processes on ‘Hydrogeomorphology’ (with Dr. Yuichi Onda) based on selected papers presented at the 5th Intl. Conf. on Geomorphology, Tokyo, Japan, International Assoc. of Geomorphologists, 2001 (pub. 2004)
Mombusho Award (Japanese Ministry of Education) for research on headwater catchment processes on a JSPS Fellowship to conduct forest hydrology research at Niigata University, Japan, May-July 2000
American Men and Women of Science, 1986-present
Sigma Xi (research honorary) 1976
Gamma Sigma Delta (agriculture honorary) 1972

American Geophysical Union:
Coordinator and co-chair (with Dr. D. Tsutsumi) of a special session on “Unusual and poorly understood erosion processes,” 2007 Spring Meeting, Acapulco, Mexico
Coordinator and co-chair (with Prof. Iio) of special session on the Chuetsu Earthquake, 2005 Spring Meeting, New Orleans
Coordinator and co-chair (with Dr. A.D. Ziegler) of special session on “Tropical Catchment Processes,” 2003 Fall Meeting, San Francisco
Invited Panel Member, “Recent advancement in forest catchment intercomparison,” 2001 Spring Meeting, Boston
Invited speaker, Chapman Conf. on State-of-the-Art Hillslope Hydrology, Bend, OR, Oct 2001

Geological Society of America:
Coordinator and co-chair (with David Montgomery and Henry Lin) of a special joint session with Soil Science Society of America on “Hydrogeomorphology and Hydropedology – Emerging disciplines that embrace earth and soil sciences,” 2008 Joint Meeting, Houston, TX

International Union of Forestry Research Organizations (IUFRO):
Organized Special workshop on “Forests and Water in Warm, Humid Asia” with Abdul Rahim Nik and M. Tani, July 10-12, 2004, Borneo, Malaysia
Co-chair of session on Forest Hydrology at XXI IUFRO World Congress in Kuala Lumpur, 2000
Chair of the Forest Hydrology Working Group, 2001-continuing

International Association of Geomorphologists:
Keynote presentation - IAG Regional Conference on Geomorphology on “Effects of Urban and Residential Development on Mass Wasting,” Goiânia, Brazil, Sept 2006
Coordinator and co-chair (with Dr. Y. Onda) of symposium - “Interaction between geomorphic changes and hydrological circulation,” 5th Inter. Conf. on Geomorphology, Tokyo, Japan, 2001
Keynote presentation - Intl. Assoc. Geomorphologists Conf. on Large Rivers and Application of Remote Sensing in Fluvial Geomorphology, National University of Singapore, Oct 2000.

Chair of panel discussion on “Topics of the 2004 Chuetsu Earthquake” at the INTERPRAEVENT symposium at Niigata University, Japan, Sept 2006

Japanese Geomorphological Union (JGU):
Keynote presentation, JGU meeting on “New Concepts in Hydrogeomorphic Processes Across Various Scales of Space and Time,” Osaka, Japan, 2003
Japan Society of Erosion Control Engineering (SABO Gakkai):
Invited keynote presentation at the 2003 National Meeting - International Division
Coordinated and chaired a panel discussion during an International SABO Gakkai meeting; panel discussion focuses on exchange of disaster information within the Asian region, 2005


Cooperative research with John Nieber (University of Minnesota) and Tammo Steenhuis (Cornell University) on mechanisms and modelling of preferential flow in soils, 2009-2011
Cooperation with researchers and graduate students from INRA, Montpellier, France (A. Stokes, M. Ghestem) on the role of plant root systems in stabilizing soil mantles, mechanically and hydrologically, 2009-2011


Invited seminar on hydrogeomorphic processes contributing to landslide erosion at Sinotech Engineering Consultants, Ltd., Taipei, Taiwan January 2011

Invited keynote lecture at workshop on initiation of landslides and flow of debris and snow avalanches, ETH, Zurich, Switzerland, April 2010 

Invited keynote speaker, 2008 International Conference on Disaster Prevention Technology and Mitigation Education, National Yunlin University of Science & Technology, Taiwan, Sept 2008   

Invited by Inst. of Geosciences, Univ. of Tsukuba to present short course on “Scientific presentation method (in English) in geo- and environmental sciences,” Jan 2005, Feb 2006, Feb 2007, Jan 2008

Invited by Watershed Research Group of the Federal University of Santa Caterina (Brazil) to give two keynote lectures on “Sediment Disaster Prevention,” Sept 2006

Invited keynote speaker and organizer of a special session on Geomorphology and Planning and Urban Geomorphology, International Assoc. of Geomorphologists, Regional Conference on Geomorphology, Goiania, Brazil; prior to meeting, invited to visit landslide research sites around Rio de Janeiro Sept 2006

Invited by President of Toyota College of Technology to present seminar, “Technical communication in English: scientific presentations and research proposals/publications,” June 2005

Invited by the Geological Survey of Japan as a landslide-hydrology expert in a workshop for CCOP nations on “Landslide hazard analysis using GIS/RS;” gave presentation on landslide modeling; Daejeon, Korea 2003

Appointed to “Environmental Earth Science” and “Hydrology” units of the Department of Geophysics, Kyoto University, 2002

Invited Abstracts
 R.C. Sidle and F. Imaizumi. 2010. Landslides and debris flows in steep terrain: hydrogeomorphic processes and linkages. Abst. No. 180935, Geol. Soc. Am., GSA Abstracts with Programs 42 (5)
 R.C. Sidle and J.L. Nieber. 2009. Complex stormflow behavior in hillslopes – temporal and spatial attributes. EOS Trans. AGU Fall Meet. Suppl., Abstract (in press)
 R.C. Sidle, T. Gomi, and T. Terajima. 2008. Scaling phenomena related to the transfer of storm water from forested hillslopes to headwater channels. 2008 Joint Ann. Mtg. (GSA-ASA-CSSA-SSSA), Houston, TX Abstract #79-7
 R.C. Sidle, T. Terajima, and T. Gomi. 2008. Scaling phenomena related to subsurface and surface storm runoff: evidence from field investigations in Japan. Hydropedology, 1st Intl. Conf., Pennsylvania State Univ., University Park, PA, p. 91
 R.C. Sidle and F. Imaizumi. 2008. Triggering mechanisms of landslides and debris flows and their linkages: hydrogeomorphic and hydropedological linkages. Hydropedology, 1st Intl. Conf., Pennsylvania State Univ., University Park, PA, p. 92
 R.C. Sidle. 2008. The role of vegetation in controlling shallow landslides. 2nd Intl. Conf. on Ground Bio- and Eco-engineering: The Use of Vegetation to Improve Slope Stability, Beijing, China, 14-18 July, 2008, p. 69
 R.C. Sidle, T. Gomi, T. Terajima, and T. Hirano. 2007. Interactions between overland and subsurface runoff on steep forest slopes: is Hortonian overland flow important? EOS Trans. AGU, 88(23), Joint Assembly Suppl. Abstract H52B-01
 R.C. Sidle. 2006. How do riparian zones and geomorphic hollows affect stormflow generation in headwater catchments? Hydrology and Management of Forested Wetlands, Proc. of the International Conference 8-12 April 2006, New Bern, NC, 701P0406

R.C. Sidle. 2006. Landslides and surface erosion from roads – experiences in Asia. In: VI Simpósio Nacional de Geomorfologia, Regional Conference on Geomorphology, Vol. I, Abstracts: 302, Goiânia, Brazil
 R.C. Sidle. 2005. Spatial and Temporal Linkages Related to Hydrogeomorphic Processes: an Emerging Discipline, EOS Trans. Am. Geophys. Union 86(18), Jt. Assem. Suppl., Abst. H41B-02
 M.E. Sakals, R.C. Sidle, J.L. Innes, D.J. Wilford, and G.E. Grant. 2005. The role of forests in reducing hydrogeomorphic hazards. In: J.L. Innes, I.K. Edwards, and D.J. Wilford (eds.) International Forestry Review 7(5): 312, Commonwealth Forestry Assoc., Shropshire, UK
 R.C. Sidle. 2005. Stormflow generation in forest headwater catchments: A hydrogeomorphic approach. In: J.L. Innes, I.K. Edwards, and D.J. Wilford (eds.) International Forestry Review 7(5): 313, Commonwealth Forestry Assoc., Shropshire, UK
 R.C. Sidle. 2003. Effects of Forest Disturbance on Chronic and Episodic Hydrogeomorphic Processes, EOS Trans. Am. Geophys.Union 84(46), Fall Meet. Suppl., Abst. B32C-01

Publications and Presentations

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