Study on the Annual Extreme Distribution of Wave Load of River-to-Sea Ships

Abstract According to the wave scatter diagram of the river-to-sea specific route waters, the applicability of the method about predicting the annual extreme wave bending moment in DNV Note 30.6 to river-to-sea ships is discussed, by using the Wave loads Calculation System (WALCS), and a method applicable to the river-to-sea ships to determine the annual extreme wave bending moment is proposed: considering the ship type and wave scatter diagram, the sea state corresponding to the annual extreme wave bending moment is to be determined by comparing the results of short-term prediction of wave loads, and based on the short-term Rayleigh distribution prediction results, the annual extreme distribution of wave bending moment, which is obeying the Gumbel distribution, is to be determined using sequence statistical method.