豊後水道の砂浪と流動場の関係

概要

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Previous studies showed that the sand waves in the Bungo Channel develop in the area whose water depth is 7Om through l00m. In this study, we calculated tides, tidal currents and the residual flow in autumn 1995 by means of a three-dimensional numerical model. We examined the relationship between the amplitude of tidal currents and the existence of sauad waves, and also between the direction of sand wave migration and that of residual flow. It is found that the distribution of sand waves coincides with the area where the amplitude of tidal currents at the spring tide is between 50cm/s and 70cm/s. The direction of sand wave migration approximately coincides with the direction of residual flow. Sand transport in the Bungo Channel is mainly controlled by the tide-induced residual flow. It is supposed that sands provided from the Hayasui Strait and the northern part of Kamadozaki are transported to the shelf slope region in the southern part of the Bungo Channel.
1999-04-05