Open AccessNEAR-SURFACE ORBITAL VELOCITIES IN IRREGULAR WAVES
Author(s) -
K.-F. Daemrich,
A. Gotschenberg
Publication year - 1986
Publication title -
proceedings of conference on coastal engineering/proceedings of ... conference on coastal engineering
Language(s) - English
Resource type - Journals
eISSN - 2156-1028
pISSN - 0589-087X
DOI - 10.9753/icce.v20.8
Subject(s) - surface wave , trough (economics) , physics , flume , geology , orbital speed , surface (topology) , mechanics , optics , geodesy , acoustics , geometry , mathematics , breakup , economics , macroeconomics , astrophysics
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.