TY  - GEN
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/21977/
A1  - Schwarz, Katja
CY  - Heidelberg
Y1  - 2016///
TI  - Spatio-Temporal Measurements of Water-Wave Height and Slope using Laser-Induced Fluorescence and Splines
ID  - heidok21977
AV  - public
N2  - Within the framework of this thesis an algorithm was designed, which extracts the height of water waves from a time series of along-wind surface pro?le images. The surface position is detected with help of thresholding and subsequently ?tted on the basis of two-dimensional smooth spline ?tting. As result a function of the height in space and time direction and its slope as well as its time derivative are obtained. For wind speeds of up to 10 m/s it was possible to identify the height with an accuracy of approximately 18 µm. Furthermore, a script for data evaluation was written, which computes general properties of the wave ?eld, like the signi?cant wave height and the mean square slope in along-wind direction, as well as the frequency spectra and the dispersion relation. Both tools were used to evaluate measurements with wind speeds from 2.5 m/s to 14 m/s performed at the Large Marseille-Luminy Wind-Wave Facility within the ASIST-campaign in June 2016. The wave ?eld di?ers from pure wind waves to additional mechanically generated waves with frequencies of 0.9 Hz and 1.3 Hz.
ER  -