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Chapter 4 - Experimental setup and test procedure
Channel bottom
Water surface
Water surface
Channel bottom
Noise
Figure 4.26: Used UVP Software, showing a sample file
After rearrangement of the velocity profiles 1 , the data was exported to a text file for further automatic
treatment with Matlab.
The Matlab treatment, which is described schematically in the flowchart on Fig. 4.27, served to
plot isoline fields of tangential velocities, the flow field in the cross-sections (radial and vertical
velocity components) and finally 3D plots of the velocity vectors over the whole channel. Since
the density of velocity vectors on the plot was much too high, only every fourth measurement
point (in vertical direction) was used for the plots. These plots are given in Appendix 11.
1. Three raw data files cover one cross-section of the channel. If the vertical profiles are numbered
from outer bank to inner bank from 1 to 9, the first measurement gives positions 3, 6 and 9, the
second one 2, 5 and 8 and the third one 1, 4 and 7.
page 96 / November 9, 2002
Wall roughness effects on flow and scouring