WAVE IMPACTS ON CAISSON BREAKWATERS SITUATED IN MULTIDIRECTIONALLY BREAKING SEAS

P. Frigaard, H.F. Burcharth, J.P. Kofoed

Abstract


The paper concerns horizontal wave forces on caisson breakwaters in multidirectional breaking seas. It is based on model tests performed in a 3D wave tank at Hydraulics and Coastal Engineering Laboratory, Aalborg University. The measured horizontal wave forces are compared to the Goda force. Good agreement with the Goda formula is found for waves not breaking directly on the structure, while increasing degree of breaking on the structure results in forces of up to 50 % higher than the Goda force. Furthermore, the reduction of the horizontal wave force on long structures due to the non full correlation of the wave pressure along the structure is investigated. A formula for the force reduction factor based on cross correlation coefficients is given as a function of the mean wave direction and the wave spreading.

Keywords


wave breaking; wave impact; caisson; breakwater

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