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The tank is
equipped with
four-paddle modular wave maker of a flap type.
The wave-maker is
computer driven and can generate waves and wave groups with prescribed
specifications.
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Up
to five resistance
type wave
gages and
up to five capacitance-type
gages
can be used simultaneously. The
gages are mounted on bars connected to the instruments
carriage.
Using
the carriage, the gages system can be placed at any
desired
position in the tank.
The
gages are precisely calibrated using step motors.
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Also
up
to five capacitance
type wave gages
have
been
installed in the win-wave flume, mounted on special instruments
carriage.
The gages array allows measuring the surface elevation across and along
the test section.
The
wave gages are
made of
oxidized Tantalum wires 0.5 mm in diameter.
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Camera calibration
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Reliable
and fast interface detection in case of unidirectional wave fields is
also possible using digital image processing of a sequence of
recorded video frames.
Video data
processing
procedure that allows studying both temporal and spatial evolution of
wave fields has been developed.
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The
image processing procedure enables accurate interface detection even
for noisy images.
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Wind speed,
fluctuation frequencies and turbulence levels are monitored using Pitot
tube and Hot Wire Annemometer.
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Water
velocity field can also be measured using the available at the School
of
Mechanical Engineering PIV (Particle Image Velocimetry) systems.
Significant experience has been gained in this field:
van
Hout, R., Shemer, L., Barnea, D (2003)
van Hout, R., Gulitski,
A.,
Barnea, D., Shemer (2002)
Polonsky,
S., Shemer, L., Barnea, D (1999)
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Water surface
velocity is measured using Particle Imaging
techniques
such as
Particle
Tracking. |
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