HR: 1340h
AN: H53B-0455    [Abstracts]
TI: Clustering of Large Particles and Their Relationship to Bed Roughness
AU: * Clancy, K F
EM: kclancy@uwsp.edu
AF: University of Wisconsin - Stevens Point, College of Natural Resources 800 Reserve Street, Stevens Point, WI 54481 United States
AU: Prestegaard, K L
EM: kpresto@geol.umd.edu
AF: University of Maryland, Department of Geology , College Park, MD 20742 United States
AB: Channels with large particles that protrude above the flow depth may constrict the channel width. The particle width constriction affects the channel very differently if the large particles are uniformly spaced along the cross section than if they are clustered or aligned in one location along the cross section. Most methods used to characterize large particles do not address the spacing or position of the large particles. Data were specifically collected to address the position of the bed particles. Particle size data were measured every 2-cm along the cross section and the particle position was recorded. Most particles sampled were larger than 2-cm, so the data were collected in a nearly contiguous manner. We defined particle clustering as those particles greater than or equal to the D84, and spaced apart by a distance of no more than the D84. We expected that as particle size increased, particle clustering size would also increase; however, we found that there was a limit to the particle clustering size, after which particle cluster size would decrease.
DE: 1525 Paleomagnetism applied to tectonics: regional, global
DE: 4558 Sediment transport (1862)
SC: Hydrology [H]
MN: Fall Meeting 2005