Abstract
Hazaki fishing port is located at the south end of the Hazaki coast with a 16 km length and facing the Pacific Ocean. A large amount of sand accumulated in the wave shelter zone of this fishing port after the extension of the breakwater, whereas beach erosion occurred at the beaches north of the fishing port. In this area, wave direction seasonally varies, while generating southward and northward longshore sand transport alternately. The effect of these changes in wave direction to beach changes was modeled using the contour-line-change model considering grain size changes. The effectiveness of beach nourishment using dredging material from the port was also investigated. The optimum location for effective beach nourishment was predicted under the wave condition with periodically changing wave directions.
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