The Hamaju coast, located on the west part of a sandy beach with 11 km length extending west from the mouth of the Kuzuryu River in Fukui Prefecture, has been eroded by various anthropogenic factors in recent years. As a measure against beach erosion, 15 detached breakwaters had been constructed between 1973 and 1994. The shoreline advanced behind the detached breakwaters, showing the conservation effect, but in the offshore zone, water depth has been increasing. This caused damages of subsiding concrete armor units. In this study, beach changes of this coast were investigated, and numerical simulation was carried out, using the contour-line-change model. Measured beach changes were well reproduced by the model.
The improvement of the national criteria on the construction method of the detached breakwater was discussed. Model calculation of beach changes after the construction of detached breakwaters was carried out using the BG model to show the problems to be revised. The Kanesaki coast was taken as an example of the beach changes after the construction of artificial reef, which is an alternate structure for the detached breakwater. Numerical simulations must be used instead of the past qualitative description in the design method of detached breakwaters.
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