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Correlative velocity fluctuations over a gravel river bed

Water Resources Research

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DOI: 10.1029/1998WR900038

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Abstract

Velocity fluctuations in a steep, coarse-bedded river were measured in flow depths ranging from 0.8 to 2.2 m, with mean velocities at middepth from 1.1 to 3.1 m s-1. Analyses of synchronous velocity records for two and three points in the vertical showed a broad range of high coherence for wave periods from 10 to 100 s, centering around 10-30 s. Streamwise correlations over distances of 9 and 14 m showed convection velocities near : mean velocity for the same wave periods. The range of coherent wave periods was a small multiple of predicted 'boil' periods. Correlative fluctuations in synchronous velocity records in the vertical direction suggested the blending of short pulses into longer wave periods. The highest spectral densities were measured beyond the range of coherent wave periods and were probably induced by migration of low-relief bed forms.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Correlative velocity fluctuations over a gravel river bed
Series title:
Water Resources Research
DOI:
10.1029/1998WR900038
Volume
35
Issue:
2
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Research
First page:
569
Last page:
582