HR: 1330h
AN: H42E-1117    [PDF]
TI: Analytical Prediction Of Meandering Channel Evolution
AU: * Chen, D
EM: dchen@dri.edu
AF: Desert Research Institute, 755 E. Flamingo RD, Las Vegas, NV 89119
AU: Duan, J G
EM: gduan@dri.edu
AF: Desert Research Institute, 755 E. Flamingo RD, Las Vegas, NV 89119
AB: The evolution of meandering channels, as a complex phenomenon, has been the research subject challenging river engineers for decades. The evolution of meandering channels is a complex morph-dynamic process resulted from the interaction among flow, sediment, and bank material. The rate of bank erosion was conventionally assumed to be proportional to the magnitude of near-bank excessive velocity or shear stress. A number of laboratory experiments on mild curved channels of flat beds indicated that the high velocity zone crosses the channel centerline at the neighborhood of the downstream inflection point instead of immediately downstream of the apex. If bank erosion only occurs at the places of high shear stress, the erosion of convex banks should be observed in these laboratory flumes, and the bends tend to subside. However, numerous experiments proved that a moderately or highly sinuous channel was initiated from a straight or mildly curved channel of no transverse slope by eroding the concave banks. Obviously
DE: 1800 HYDROLOGY
DE: 1815 Erosion and sedimentation
DE: 1824 Geomorphology (1625)
DE: 1860 Runoff and streamflow
SC: Hydrology [H]
MN: 2003 Fall Meeting