Abstract
A surface drift-card experiment conducted in the Bisan Straits, the central part of the Seto Inland Sea, is described. Plastic drift-cards totalling 4800 were released, of which 1523 (31·7%) were recovered, and a statistical analysis of the recovery data was carried out to determine the average advective velocity and horizontal dispersion of the surface water in the inland sea. It became clear that the surface water of the western Bisan Straits would have a tendency to move towards west, while that in the eastern Bisan Straits would be mostly transported eastwards. This suggests the existence of some oceanographic ‘barrier’ which prevents the water exchange between the eastern and western parts of the inland sea. Since the barrier-like feature of the surface drift in the Bisan Straits appears in the lowest density area in the Seto Inland Sea, we may conclude that this feature is closely related to nontidal water circulation due to a density current.
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