Bedrock channel morphology

Citation
Ee. Wohl et Dm. Merritt, Bedrock channel morphology, GEOL S AM B, 113(9), 2001, pp. 1205-1212
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN journal
0016-7606 → ACNP
Volume
113
Issue
9
Year of publication
2001
Pages
1205 - 1212
Database
ISI
SICI code
0016-7606(200109)113:9<1205:BCM>2.0.ZU;2-X
Abstract
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 criteri on based on reach-averaged channel gradient, substrate heterogeneity, and S elby rock-mass strength. This criterion correctly classified 70% of the obs ervations into one of five channel morphologic types. Channels formed at hi gher gradients have a morphology that effectively maximizes the erosional f orce, whereas a morphology that evenly distributes flow energy or dissipate s 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 res isting forces.