Abstract
Significant beach erosion has been developed on Nagayama-hama, Irabu Island, Okinawa Prefecture due to change of sediment movement by the construction of a bridge connecting the Irabu Island and the Miyako Island. This study aims at describing the erosion mechanisms on the basis of bathymetry measurements as well as numerical modeling of waves, currents and sediemnt movement. The performance of a sand-packed jetty tentatively introduced against beach erosion is also discussed by comparing beach topographies before and after the construction. It is found that the sand-packed jetty keeps its performance to reduce downdrift erosion although it tends to settle gradually owing to the local scour.
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