On the Hamamatsu-Shinohara coast, beach nourishment using 8.6×105 m3 of sand and gravel has been carried out since 2005 with monitoring surveys. The beach changes after the beach nourishment were reproduced using the BG model (a three-dimensional model for predicting beach changes based on Bagnold’s concept). Then, the beach changes after 20 years were predicted using the model, and the effect of beach nourishment using coarse material was evaluated along with the evaluation of the beach nourishment using sand deposited in the reservoir upstream of Akiba Dam. Finally, the effectiveness of beach nourishment using coarse material was shown.
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