Question
What is a white noise simulation?
Answer
A white noise simulation refers to the modelling of a so-called white noise spectrum, i.e. a frequency spectrum with a uniform spectral density (e.g. 0.1 m*m/Hz) on a range of frequencies (e.g. 0.001 to 0.1 Hz). Although not representing a natural sea state, a simulation with a white noise spectrum as model input can reveal the resonance periods of any port or harbour layout in a very efficient and clear manner.
You can find a description on how to create a white noise spectrum using MIKE 21 Toolbox in the pdf-file under Related Attachments below.
Purpose
The purpose of a white noise simulation in MIKE 21 BW is to investigate the potential for seiching (long wave oscillations) and assessment of the natural frequencies of an arbitrary shaped port or harbour layout.
Conclusion
Since the white noise spectrum represents a synthetic sea state, the results can only be used as basis for a general assessment of the natural periods. Hence, it cannot be concluded - based on the white noise simulation - whether or not long-period oscillations or resonance will naturally develop under natural wave conditions. This has to be investigated using a natural sea state.
The following paper includes an example of white noise modelling: "Wave Disturbance Modelling in the Port of Sines, Portugal - with special emphasis on long period oscillations"
FURTHER INFORMATION & USEFUL LINKS
Scientific papers and publications