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Fig. 2. Vertical profiles of RMS turbulence intensity in the three flow treatments
having a free-stream velocity of U=5 cm s–1.
Turbulence intensities were derived from ADV measurements of horizontal
velocity at (A) the location of stimulus release and (B) the starting position
of test animals, which was 1.5 m downstream from the stimulus source. Data for
the smooth condition is the same as that shown in
Fig. 1 and is included here for
the sake of comparison. The bump and cylinder obstructions increased
turbulence intensity near the sediment surface relative to unobstructed flow,
an effect that persisted throughout the test section.
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