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Knowledge of the actual condition of hydrodynamics in the nearshore andcoastal area is essential for coastal monitoring activities. To this end, acoastal operational model system can serve as a tool in providing recent andup-to-date, state-of-the-art hydrodynamics along the coast. In this paper, weapply CoSMoS (Coastal Storm Modeling System), a generic operational wave andtide-surge modelling system applied here to predict waves and water levelsalong the Dutch coast. The CoSMoS application is not limited to storm impactprediction on the Dutch coast, but can also be applied to other coastalhazards such as rip currents and coastal flooding, in other environments.In this paper, we present the set-up of the CoSMoS system and a validationof the wave and surge model, with deep-water wave buoy data and tidalgauge measurements as ground truth validation material. The evaluation ispresented as monthly error measures between computed parameters and observedones. Hindcast results over the whole year of 2009 show that the simulatedwave parameters and surge elevation from the CoSMoS are in good agreementwith data, with average root mean square (rms) error over the year of 0.14 m forthe surge elevation and 0.24 m for the significant wave height. It is notedthat there is a tendency of the wave model to underestimate the height ofnortherly waves with lower frequencies (swell). Additionally, when a waveseparation algorithm is applied on the overall spectrum, results showconsistent underestimation of the swell component by the model, which forthe Dutch coast will mainly come from the north, where the North Sea is opento the Atlantic Ocean. In the proposed model system, the swell boundary canhave a significant effect on the simulated wave results, suggesting room forimprovement for the swell boundary conditions to the north and the swellpropagation within the Dutch Continental Shelf Model. Finally, we show thatin forecast mode, CoSMoS can provide reasonably good wave and surgeprediction

A validation of an operational wave and surge prediction system for the Dutch coast