NORTH SEA WIND WAVES ON TIDES AND STORM SURGES

Hendrick L. Tolman

Abstract


The influence of tide- and surge-induced currents and surface level variations on wind wave generation and propagation in the North Sea is investigated. The main interest is focussed on the shift of the absolute frequency due to time varying currents. For several North Sea storms calculations have been performed with a third-generation wave model, which includes all relevant effects of wave-current interactions and wave generation. Results of several hindcasts have been compared with data. The study shows that tides and surges result in relatively small but distinct modulations of mean wave parameters (5-10%), and large variations of spectral energy densities (50%). The tide-induced modulations of in particular wave periods are strongly influenced by the unsteadiness of depth and current. Observed modulations of mean wave parameters with periods comparable to that of the tide appear to be wind-induced for a significant part.

Keywords


storm surge; storm tide; North Sea; wind waves

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