Abstract
A model for predicting the formation of a sandy beach on a reef flat was developed applying the contour-linechange model. The condition of a sandy beach on the Oku coast with coral reefs in Okinawa was investigated. On this beach, a stable sandy beach with a slope of 1/10 was developed due to the shoreward sand transport, the materials of which were originally supplied from the coal reef. The formative mechanism was investigated using a movable bed experiment. It was confirmed that coarse sand placed on the flat surface is carried shoreward, resulting in the formation of a beach with a steep slope. This mechanism was simulated using the BG model (Serizawa et al., 2006), given the equilibrium slope of sand. Predicted results were in good agreement with the experimental results.
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