length À = 550 nm) in the light beam of the Xenon arc lamp
and a red Schott glass filter (cut-on wavelength À = 600 nm)
on camera 1 (Fig. 12).
Figure 12: Typical image of the combined flow and wave-field
visualization.
5 RESULTS
The combined flow- and wave-visualization allows the study
of transport processes near the water surface. Fig. 13 shows
three consecutive images taken 3 s apart of breaking wave.
Energy is transported from the wave-field to flow-field, a tur-
bulent wake behind the wave is established.
energy Isi
0 wave energy CLEAR!
vorticity [1/s]
0 wave energy icm2/s?; 310.0 i
vorticity [1/s]
Figure 13: Sequence of the simultaneously measured wave- and
flowfield. For each time step: First stripe shows original wave
slope image, second the energy extracted from wave images, third
the energy in the flowfield, and fourth the vorticity. Due to wave
breaking energy is transported from the wave field to the flow field.
236
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[Jähne, 95] Jähne, B., 1995. Digital Image Processing,
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[Jähne et al., 94] Jahne, B., Klinke J. and Waas, S., 1994.
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