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Aquatic and Riparian Ecosystems
My primary research interests are on the geomorphology and sedimentation processes in steep mountain streams. Within this broad field I am interested in the influence of streamflow and sediment supply on sediment transport rates, channel processes, and variation in channel morphology. I work mainly in the subalpine environments of Colorado and Wyoming where streamflow is generated primarily by snowmelt. I have also been involved in assessing methods for measuring bedload, including comparing data collected with different types of samplers and the use of an underwater camera for monitoring bedload movement; in the future, I will be involved with testing the feasibility of an acoustic sampler for detecting gravel movement in coarse-grained channels. New research on the effects of fire on sedimentation and channel processes in a moderately burned watershed is planned for the next few field seasons.
Ryan, S.E., Porth, L.S., and Troendle, C.A., In review. Phases of Bedload Transport Defined Using Piecewise Regression. Planned outlet Earth Surface Processes and Landforms.
Martinez, M.H., and Ryan, S.E., 2000. Constructing Temporary Platforms for Hydrologic Studies. General Technical Report RMRS-GTR-64. Ogden, UT. USDA Department of Agriculture, Forest Service, Rocky Mountain Research Station. 10 p.
Ryan, S.E. and Porth, L.S., 1999. A Field Comparison of Three Pressure-Difference Bedload Samplers. Geomorphology 30:307-322.
Ryan, S.E. 1997. Morphologic Response of Subalpine Streams to Transbasin Flow Diversion. Journal of the American Water Resources Association 33(4):839-854.
Ryan, S.E. and Grant, G.E. 1991. Downstream Effects of Timber Harvesting on Channel Morphology, Elk River Basin, Oregon. Journal of Environmental Quality 20(1):60-72.
Geological Society of America
American Geophysical Union, Hydrology Section
American Water Resources Association
USDA Forest Service
Rocky Mountain Research Station
240 West Prospect
Fort Collins, CO 80526
Phone: (970) 498-1015
Fax: (970) 498-1212
USDA Forest Service - RMRS - RWU4352