Frequently Asked Questions


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    Entered: 2016-9-19
  • Question:

    Waves: What is a white noise simulation?


    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.

    The model input is a so-called a 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 in a very efficient and clear manner the resonance periods of any port or harbour layout.

    It must be stressed that 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 on basis of 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"

    For further reference please see papers and other documentation from this website.