Joint distributions of Wind/Waves/Current in West Africa and derivation of multivariate extreme I-FORM contours

In-situ measurements over a three year period have been extensively analysed from a statistical point of view. Distributions of wind and current (intensity and direction), together with waves systems - main swell, secondary swell and wind sea - (peak period, significant wave height, spectral width, direction) are analysed jointly, looking for possible correlation between the variables (principal component analysis, statistical tests, ...). When correlation was proven, joint distributions have been estimated and modelled by analytical distribution laws. As distribution of extreme values may differ from distribution for intermediate values, matching of the two solutions is performed. Finally, I -FORM contours are derived based on the analytical laws. For coherence with extreme value prediction, some constraints are imposed so that 100 year extreme value estimation for the significant wave height, current velocity and wind velocity is consistent