Abstract
Authors have developed the offshore structure for control of sea environment named S-VHS construction
 method, which is composed of the sloping top slit-type caisson and steel pipe piles. The sloping top form enables to
 realize the remarkable reduction of wave force exerted on the dike body compared with the conventional one.
 In this paper, hydraulic feature with wave dissipation ability and wave force reduction effect are verified
 through some hydraulic experiments. After the preliminary study for the valid structure form, reflection and
 transmission ability for the selected structure models were tested with the hydraulic experiment relevant to the ratio of
 caisson width and wave length. Finally, wave force experiment was executed and it revealed the performance of wave
 force reduction. Based on the results, we proposed specific design wave force formula for S-VHS construction method.
Highlights
MMZ (Marine Multi Zone) project has executed by Ministry of works of Japan since 1979. over 20 companies such as contractors, steel producers, and shipbuilders are participated in this project
Through some fundamental studies, required reflection and transmission ability are decided for the MMZ structures that reflection and transmission ratio do not exceed 0.5 and 0.6 under average wave condition, respectively
Good wave dissipation ability was reported for the constructed VHS in some coasts, the wave force which acts on an anterior wall was comparatively larger
Summary
Authors have developed the offshore structure for control of sea environment named S-VHS construction method, which is composed of the sloping top slit-type caisson and steel pipe piles. The sloping top form enables to realize the remarkable reduction of wave force exerted on the dike body compared with the conventional one. After the preliminary study for the valid structure form, reflection and transmission ability for the selected structure models were tested with the hydraulic experiment relevant to the ratio of caisson width and wave length. Wave force experiment was executed and it revealed the performance of wave force reduction. We proposed specific design wave force formula for S-VHS construction method
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