HR: 1340h
AN: H53D-0486 [Abstracts]
TI: Longitudinal and Vertical Displacement of Gravel and Cobble Tracers During Individual Flood Events in a
Western Washington Stream
AU: * Brown, T M
EM: tmbrown@u.washington.edu
AF: University of Washington, Department of Civil and Environmental Engineering
Box 352700, Seattle, WA 98195-2700
United States
AU: DeVries, P
EM: pdevries@r2usa.com
AF: R2 Resource Consultants, 15250 N.E. 95th Street, Redmond, WA 98052
United States
AU: Burges, S J
EM: sburges@u.washington.edu
AF: University of Washington, Department of Civil and Environmental Engineering
Box 352700, Seattle, WA 98195-2700
United States
AB:
The movement of gravel and cobble tracers during individual, rain-induced flood events was observed in a western Washington
catchment (Issaquah Creek, 142 km2). Displacement and burial depth of over 600 painted particles (25.4 mm < D < 180
mm), most inserted with neodymium magnets, was measured along the stream bed following periods of flow competence occurring
in Issaquah Creek from autumn 2003 through spring 2005. Using 15-minute incremental USGS stream flow data, we examined the
relation between the magnitude and duration of excess shear stress, the mean distance of movement, burial depth and mean
particle size. The results of our study, to date, are presented.
The purpose of this research is to continue to explore the utility of bedload tracers in sediment transport. Our primary
objective is to examine the longitudinal and vertical displacement of particles in the bed on an event-by-event basis, and to
determine if a viable set of tools can be derived from this type of analysis. Our future plans include collecting
additional field data in Issaquah Creek, and augmenting the data set with data from our colleagues whom are conducting a
collaborative flume study at the St. Anthony Falls Laboratory in Minneapolis, Minnesota.
DE: 1825 Geomorphology: fluvial (1625)
DE: 1856 River channels (0483, 0744)
DE: 1860 Streamflow
DE: 1862 Sediment transport (4558)
DE: 1894 Instruments and techniques: modeling
SC: Hydrology [H]
MN: Fall Meeting 2005