Beach changes around an artificial reef with crests on the Kaike coast were investigated through field observations, and compared with the beach changes around the detached breakwaters. Strong shoreward currents were induced due to wave breaking on the reef, resulting in the formation of a tombolo with a scale less than that of the detached breakwater. Also rip currents were generated, and scouring was measured in the opening. These beach changes were predicted using the BG model proposed by Serizawa et al. (2006). Predicted results were in good agreement with the measured.
Long-term changes in sand bar in Sanbyakken region in Nakatsu tidal flat were investigated through the comparison of the aerial photographs. Great changes have occurred in this sand bar in recent years, as aresult of increase in eastward longshore sand transport since 1998. The reason was studied in terms of change in wave field. Waves with the direction of N70deg E, which was determined from the shape of the sand bars on the tidal flat, were significantly sheltered due to the offshore breakwater of Nakatsu Port. Takingthe refraction effect of these diffracted waves into account, the tip of the sand bar was also sheltered by the waves. It was found that this caused increase in longshore sand transport.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.