Affiliations: Kagoshima Environmental Research and Service,
Nanatsushima 1-1-5, Kagoshima 891-0132, Japan. | Department of Environmental and Information Sciences,
Faculty of Fisheries, Kagoshima University, Shimoarata 4- 50-20, Kagoshima
890-0056, Japan.
Abstract: The tidal water mass exchange in an inland sea with archipelago is
numerically studied adopting the control volume based 2-dimensional finite
element method to cope with the complex coastline. Yatusiro Sea situated in the
south-west of Kyushu, Japan is the model inland sea of our study. Water mass
exchange by semi-diurnal (M_2) tidal flow is investigated by the dispersion of
Lagrangean particles and by the Eulerean tidal residual flow. Main results are
as follows: i) Except the southern part of Ariake Sea and Nagashima Strait, the
most part of Lagrangean particles still stay in the areas after 20 periods. ii)
The particles in Ariake Sea (Yatusiro Sea) flow into Yatusiro Sea (Ariake Sea)
through Yanagi-seto (Misumi-seto). iii) The particles in Hachiman-seto flow
into Yatusiro Sea through Oh-seto and Gannojiri-seto. iv) The particles in the
south part of Yatusiro Sea flow into Nagashima Strait through Mebuki-seto and
Ikara-seto. v) In the Eulerean tidal residual flow, there exists a clock-wise
vortex around Shishijima island in Yatusiro Sea.
Keywords: water mass exchange, finite element method, tidal flow, Lagrangean particle dispersion, archipelago, inland sea