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Note: ADOPT

Abstract: The numerical simulation of the ship response for the ADOPT DSS requires a reliable representation of the sea state, which has to be generated from different available environmental data sources including wind and wave information. Depending of the application mode of the ADOPT DSS data sources are: real time measurements onboard for ship operations or hindcast data for design and training. For the operational mode of the ADOPT DSS sea-state data will be measured by the Wave Monitoring System (WaMoS II) sensing system by using a X-band nautical radar that was developed for real-time monitoring of the surrounding ocean wave fields. The full two-dimensional frequencydirection wave spectrum and sea state parameters such as significant wave height, peak wave period and direction both for windsea and swell are derived. For the design and training mode long term hindcast data are used to cover a huge sample of sea states in a consistent way. Special emphasis is put on the two-dimensional frequency-direction wave spectrum as basic input to the ADOPT DSS to cover multimodal sea states. A methodology has been developed to calculate two-dimensional wave spectra according to the different kind of input data and a procedure to create irregular seaways out of those. The qualities of these data sets are examined and an attempt is made to quantify the related uncertainties. This paper will present the different data sources, the data flow and handling towards the ship response simulations module of the ADOPT DSS.