潮汐流による伊唐瀬戸の海水交換

概要

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A control volume based up-wind finite element method was applied to the two-dimensional tidal flow in Ariake Sea and Yatsushiro Sea. Water mass exchange in Ikara-seto located south-west of Yatsushiro Sea was investigated by pursuing the fictitious water particles as well as estimating the inflow and outflow water masses through boundaries. The main results are as follows : i) From Euler's point of view, water mass flows into Ikara-seto from Yatsushiro Sea and flows out to Nagashima Strait ; 86.5% (13.5%) of water mass flows out from the north (north-west) boundary, ii) From Lagrange's point of view, fictitious water particles flow out from the north and north-west boundaries. 66.1% (21.9%) of water particles flow out within 1 period when particles are thrown into the sea at low tide (high tide), iii) After 4 periods, most part of the water particles flow out from Ikara-seto. However, the water particles in Ikara Bay still remain.
1998-12-24