Journal
GEOMORPHOLOGY
Volume 93, Issue 3-4, Pages 368-383Publisher
ELSEVIER
DOI: 10.1016/j.geomorph.2007.03.008
Keywords
bedload transport; critical shear stress; unit stream power; step-pools
Ask authors/readers for more resources
This paper presents an analysis of critical thresholds for bedload transport based on field measurements conducted in two small, high gradient streams: the Rio Cordon (Italian Alps) and the Tres Arroyos (Chilean Andes). The threshold of incipient motion was identified by using marked particles displacement and both flood and flow competence approaches. The findings are expressed in terms of Shields parameter, dimensionless discharge, and specific stream power, and are used to identify the effects of relative grain size, relative depth, and bedform, resistance. Overall, particle entrainment tends to be size selective, rather than exhibiting equal mobility, and the high values of dimensionless critical shear stress observed at both study sites confirm the additional roughness effects of step-pool morphologies that are very effective in reducing the bed shear stress and causing an apparent increase in critical shear stress. (c) 2007 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available