Author(s): Carl Trygve Stansberg

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Abstract: The theoretical background and the interpretation of directional parameters derived from the first two complex Fourier coefficients of the directional distribution, or corresponding circular moments, is reviewed. It is found that for a four-parameter bi-modal spectrum type, cases with small secondary peaks can be clearly distinguished from cases with almost equal peaks. Some other relationships are also noticed. A simple and robust parametric estimation method is suggested and discussed. Statistical errors in parameters estimated from finite time series are investigated. Through a numerical case study, the resulting variability in directional parameters is illustrated. For the actual, limited set of conditions included in the case study, the main structures of the spectral characteristics are reasonably well identified from a given set of records, with a limited level of accuracy given by the variability.

DOI: https://doi.org/10.1080/00221680209499941

Year: 2002