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Estimating depth-averaged velocities in rough �channels

✍ Scribed by Byrd, Tracy C.; Furbish, David Jon; Warburton, Jeff

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
99 KB
Volume
25
Category
Article
ISSN
0360-1269

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✦ Synopsis

Profiles of streamwise velocity obtained from North Boulder Creek, Colorado, typically are non-logarithmic in form and exhibit the strong influence of form drag associated with coarse bed roughness. The spatially averaged profile is consistent with recent theoretical profile forms suggested for rough channels that are based on a partitioning of the total stress between a fluid part and a part associated with form drag on bed particles. Estimates of local depth-averaged velocity using algorithms that are based on several measurements in the flow column improve with explicit Riemann averaging, versus simple averaging, of the measurements. Estimates based on a single-point measurement at 0Á6 of the flow depth, assuming a logarithmic or approximately logarithmic velocity profile, are the least reliable.

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The effect of roughness configuration on
The effect of roughness configuration on velocity profiles in an artificial channel
✍ Wohl, Ellen E.; Ikeda, Hiroshi 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 254 KB 👁 2 views

In order to determine the effect of bed roughness on velocity distribution, we used seven different configurations of bed roughness, with 16 test runs of varying discharge and slope for each configuration. For each run, one-dimensional velocity profiles were measured at 1cm vertical increments over