THE EFFECT OF WAVES ON SURGES IN THE NORTH SEA

C. Mastenbroek

Abstract


Three effects of surface gravity waves on storm surges in the North Sea are studied with numerical models. The enhancement of the effective sea surface roughness due to growing waves causes the storm surge to build up more quickly. The maximum effect on the waterlevel along the English and Dutch coast is about 5 % of the total waterlevel elevation due to the storm. The effect of the radiation stress is opposite: it slows down the building up of the surge in the beginning of the storm. The maximum effect of the radiation stress is about 2 %. The enhancement of the bottom drag by swell in shallow water can be considerable. The lack of detailed insight in the local bottom roughness and the turbulence near the bottom defies a quantitative analysis.

Keywords


North Sea; surge

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