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Communication Dans Un Congrès Année : 2001

A field study of transport and mixing in a river using an acoustic Doppler velocity profiler

Résumé

A 3-D Acoustic Doppler Velocity Profiler (ADVP) is used for measuring closely spaced profiles across the river Poisine (on a straight river reach with mean water depth ≈ 0.5 m, width ≈ 12 m, flat gravel bed with estimated D 50 ≈ 6 cm). The mean streamwise velocity profiles show logarithmic profiles all across the half section, decreasing towards the bank. Most of the three turbulence intensities profiles between the center (B/y=0.5) and B/y=0.24 agree relatively well with laboratory profiles. Closer to the bank (B/y<0.25) strong deviations in the profile form indicate "side-wall" effects. A cumulant discard method is applied and conditional statistics and conditional sampling are used to compare the experimental relative covariance contributions from the four quadrants in all three planes. In the center, all quadrant distributions correspond to those observed in laboratory open-channel flow. Near the bank, significant differences between the results for different depths occur in all planes. Thus, the flow near the bank cannot be considered two-dimensional.
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hal-00230406 , version 1 (05-02-2020)

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  • HAL Id : hal-00230406 , version 1

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David Hurther, Ulrich Lemmin, Koen Branckaert. A field study of transport and mixing in a river using an acoustic Doppler velocity profiler. International Conference on Fluvial Hydraulics, IAHR, 2001, Louvain-la-neuve, Belgium. ⟨hal-00230406⟩

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