Erosion, Sedimentation, and Geomorphology
Correlative velocity fluctuations over a gravel river bed
Article first published online: 9 JUL 2010
This paper is not subject to U.S. copyright. Published in 1999 by the American Geophysical Union.
Water Resources Research
Volume 35, Issue 2, pages 569–582, February 1999
How to Cite
1999), Correlative velocity fluctuations over a gravel river bed, Water Resour. Res., 35(2), 569–582, doi:10.1029/1998WR900038.(
- Issue published online: 9 JUL 2010
- Article first published online: 9 JUL 2010
- Manuscript Accepted: 21 SEP 1998
- Manuscript Received: 28 MAY 1998
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.