NDLI: Seasonal Modelling of Multivariate Distributions of Metocean Parameters

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Fouques, Se´bastien Myrhaug, Dag Nielsen, Finn Gunnar
Copyright Year	2002
Abstract	Statistical information about the joint occurrence of metocean parameters is of importance for many offshore activities. For instance, in marine operations, environmental limitations may be brought about by both wind and wave conditions. Thus, knowledge of their joint occurrence is important as the persistence duration and the seasonal dependence of wind and waves appear to be of large interest. However, such a modelling becomes difficult as the number of considered variables increases, especially when utilizing a common parameterization of some conditional distributions. This paper proposes a general methodology that aims at modelling seasonal joint distributions of n such parameters from their correlation structure and the n marginal distributions fitted by generalized gamma ones. Two methods are proposed in order to derive an approximate joint distribution from the modelled margins. The first one matches the correlation matrix only, whereas the second one, which is based on a multivariate Hermite polynomials expansion of the multinormal distribution, is able to match joint moments of order higher than two. However, more restrictive conditions are shown by the latter. An application to the simple example of the joint occurrence of significant wave height and the mean wind velocity at the 10m elevation is used to illustrate the methods. Eventually, examples of applications like simultaneous persistence of wind and wave conditions as well as seastate forecasting from statistics are given.
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	55
Ending Page	65
Page Count	11
File Format	PDF
ISBN	0791836126
DOI	10.1115/OMAE2002-28048
e-ISBN	0791835995
Volume Number	21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 2
Conference Proceedings	ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2002-06-23
Publisher Place	Oslo, Norway
Access Restriction	Subscribed
Subject Keyword	Wind Wind velocity Ocean engineering Statistics as topic Polynomials Modeling Waves Significant wave heights
Content Type	Text
Resource Type	Article

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