HR: 1340h
AN: H13D-1537    [Abstracts]
TI: Spatial and Temporal Patterns of Sediment Transport in a Small Stream
AU: * Caulkins, J L
EM: caulkins@geog.ubc.ca
AF: Department of Geography, University of British Columbia, 1984 West Mall, Vancouver, BC V6T 1Z2, Canada
AU: Hassan, M
EM: mhassan@geog.ubc.ca
AF: Department of Geography, University of British Columbia, 1984 West Mall, Vancouver, BC V6T 1Z2, Canada
AB: In this paper we attempt to link the distribution of shear stress and sediment sources/destinations at the reach- scale in East Creek, a small, forested, gravel-bed river in coastal British Columbia. The study reach is characterized by low sediment supply where a majority of the transported material comes from the bed of the channel. The shear stress distribution is modeled using River2D, a numerical hydraulic flow model. The model is calibrated using flow and channel topography data collected at the field site. On average, the site receives 9 to 12 rain-dominated, sediment mobilizing flood events per year, ranging from moderate flows to bankfull discharge. We identify sediment sources and destination zones by annually recovering 1400 magnetically tagged tracer particles placed in two distinct channel morphologies (rapid (plane bed) and riffle-pool). Sediment mobility depends largely on within-reach sediment storage and channel morphology. By measuring the distance of travel and depth of burial and estimating bed shear stresses, a morphological model of preferential sediment transport and storage is developed.
DE: 1825 Geomorphology: fluvial (1625)
DE: 1847 Modeling
DE: 1862 Sediment transport (4558)
SC: Hydrology [H]
MN: 2007 Fall Meeting