Publications

Queirós, J., Bernardino, M. and Guedes Soares, C. (2012), “Influence of wave data bases on the long term prediction of wave induced loads in ships”, Maritime Engineering and Technology, Guedes Soares et al. (Eds),Taylor & Francis Group, London, pp. 513-523

The North Atlantic routes and the wave climate to which the ships are subjected are studied using global wave data samples for each route obtained from global wave climate data bases. A comparison of the results obtained for three wave data bases is made for a grid covering the North Atlantic Ocean.Two transatlantic routes are considered. The significant wave height is compared for HIPOCAS, ERA-40 and COADS data sets, by evaluating the average values obtained for several periods and performing error calculations between the different data sets. Similar patterns were found for HIPOCAS and ERA-40, being the first the one that shows higher maxima. COADS have smaller seasonal amplitude between maxima. The same procedure is applied to the average period, only for HIPOCAS and ERA-40 data. Higher maxima were found for the second and different contour patterns. Data sets (HIPOCAS e ERA-40) of significant wave height and peak period associated with the two transatlantic routes are obtained. A study on the suitability of the Lonowe model for the description of the sea state by determining the joint probability distribution function for both routes is performed. A long-term formulation of wave induced vertical bending moments is applied to the several sea state descriptions obtained from different data, in order to achieve the value of wave induced vertical bending moment response, considering an exceeding long term probability of 10-8. For this probability level HIPOCAS data shows higher values than ERA-40.

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