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GSA Bulletin; September 2001; v. 113; no. 9; p. 1205-1212; DOI: 10.1130/0016-7606(2001)113<1205:BCM>2.0.CO;2
© 2001 Geological Society of America
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Bedrock channel morphology

Ellen E. Wohl*,1 and David M. Merritt{dagger},1

1 Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80523-1482, USA

Analyses of 41 bedrock channel reaches indicate quantifiable relationships between bedrock channel morphology and reach- scale hydraulic and substrate variables. Discriminant analysis was used to develop a discriminant criterion based on reach-averaged channel gradient, substrate heterogeneity, and Selby rock-mass strength. This criterion correctly classified 70% of the observations into one of five channel morphologic types. Channels formed at higher gradients have a morphology that effectively maximizes the erosional force, whereas a morphology that evenly distributes flow energy or dissipates flow energy internally is associated with lower gradients. These results suggest that bedrock channel morphology, like alluvial channel morphology, reflects a quantifiable balance between hydraulic driving and substrate resisting forces.

Key Words: bedrock channels • channel classification • channel morphology • multivariate statistics




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