No. 20 (1986), Conference Proceedings
No. 20 (1986)

NEAR-SURFACE ORBITAL VELOCITIES IN IRREGULAR WAVES

Conference Proceedings
Published 1986-01-29
K.-F. Daemrich
Franzius-Institut, University of Hannover
A. Gotschenberg
Franzius-Institut, University of Hannover
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Keywords

irregular wave
orbital velocity
near surface velocity

How to Cite

NEAR-SURFACE ORBITAL VELOCITIES IN IRREGULAR WAVES. (1986). Coastal Engineering Proceedings, 1(20), 8. https://doi.org/10.9753/icce.v20.8
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Abstract

The paper deals with measurements of horizontal orbital velocities near the surface of mechanically generated waves in a wave flume. Due to the characteristics of most velocity probes, it is difficult or impossible to measure with a fixed probe in the area above the lowest trough. As the probe is not submerged continuously, failures or uncertainties in the measurements may occur. To overcome these limitations, a movable frame for the velocity probe was designed, which can be moved vertically up and down with the surface elevation by a disc rotor servo motor, controlled by a wave gauge. By that continuously velocities up to 3 cm below the surface could be measured. Theoretical velocities have been calculated for comparison with different simulation methods for irregular waves, based on linear wave theory.
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