EXPERIMENTAL STUDY ON WAVE FORCE CHARACTERISTIC OF BREAKWATER WITH LOW CREST DISSIPATING BLOCKS TO MORE THAN 60 DEGREES OF SHARP-ANGLED INCIDENT WAVE

Abstract

 In this study, we considered wave force characteristic by plane hydraulic model experiment in case more than 60 degrees of sharp-angled incident wave against a caisson having breakwater with low crest wave dissipating blocks in the part of the trunk of breakwaters under construction. The main conclusions are as follows. (1) The impulsive wave pressure does not occur by low crest wave dissipating blocks. On the other hand, 1)The wave height increases by growth of meeting wave from upper side area with no wave dissipating blocks. 2)The wave pressure exceeds Goda value in most of the erect part by concentrating wave in the space between the blocks by the low crest wave dissipating works and the caisson wall. (2) The peak wave force which acts on the whole caisson is restrained because the action time of the wave is delayed from upper side to down side. (3) The peak horizontal wave force is restrained when the waves in the front face of caisson and diffracted waves going around to the back face becomes in phase. (4) The peak vertical wave force is restrained because downward wave force by wave overtopping acts on the caisson superstructure during pressure wave.