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A revised velocity-reversal and sediment-sorting model for a high-gradient, pool-riffle stream

Physical Geography

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, , and

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Abstract

Sediment-sorting processes related to varying channel-bed morphology were investigated from April to November 1993 along a 1-km pool-riffle and step-pool reach of North Saint Vrain Creek, a small mountain stream in the Rocky Mountains of northern Colorado. Measured cross-sectional areas of flow were used to suggest higher velocities in pools than in riffles at high flow. Three hundred and sixteen tracer particles, ranging in size from 16 mm to 256 mm, were placed in two separate pool-riffle-pool sequences and used to assess sediment-sorting patterns and sediment-transport competence variations. Tracer-particle depositional evidence indicated higher sediment-transport competence in pools than in riffles at high flow. Pool-riffle sediment sorting may be created by velocity reversals, and more localized sorting results from gravitational forces along the upstream sloping portion of the channel bed located at the downstream end of pools.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A revised velocity-reversal and sediment-sorting model for a high-gradient, pool-riffle stream
Series title:
Physical Geography
Volume
17
Issue:
2
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Physical Geography
First page:
142
Last page:
156
Number of Pages:
15