2005 Volume 49 Pages 1273-1278
Recently, reduction of fish catch and poor harvest of cultured laver have been serious social problems in the Ariake sea, which is a typical macrotidal semi-enclosed bay in Japan. Therefore, countermeasures of these problems have been needed. We have proposed a new water-purification method to control a pattern of tidal residual current by using “Bottom Roughness” which has an asymmetric 3-dimensional shape with directional resistance property.
In this study we examined the effect of Bottom Roughness on activation of tidal exchange between the northern part and the southern part of Ariake sea by both model and numerical experiments. As a result of the present study, it becomes clear that i) Bottom Roughness can activate the tidal exchange sufficiently and ii) tidal exchange at the cross-section connecting Ariake with Nagasu plays a very important role for mass transport in the northern Ariake Sea.
