Abstract
Selective movement of sand into a submarine canyon depending on the grain size was investigated using the contour-line-change model. Seabed topography and grain size distribution were measured around the submarine canyon off the Morito River on the Seisho coast. The seabed slope of this submarine canyon is as steep as 1/6 in the depth shallower than 10m and 1/3 in the depth deeper than 10m. Assuming that the coarse (fine) material has a large (small) equilibrium slope, and that if seabed slope is greater than the equilibrium slope, offshore sand movement is occurred, a model for predicting offshore discharge of sand was developed.
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