多層モデルによる鹿児島湾の夏季の流動と密度場の数値シミュレーション

概要

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A multi-level model is applied to the simulation of tidal currents and density field of Kagoshima bay in summer. Tidal currents are calculated for tidal level of twelve hours (M_2) given at the mouth of the bay. Heat flux is given by a constant value at sea surface, neglecting the diurnal changes. Numerical simulations are conducted in time marching from an initial state of the variables using a finite difference method. Time averaged values of 25th period of tidal oscillation from the initial state are taken as steady solutions. Distributions of the residual current, temperature, salinity and density thus obtained are compared with available observations. As an application of the present method, tidal simulations are presented for the past topography of Kagoshima bay before the eruption in 1914, by which East Sakurajima Strait were blocked with lava. Distributions of temperature and salinity before the eruption were compared with those of present bay. Effects of East Sakurajima Strait on the physical environment are presented in graphics.
社団法人日本船舶海洋工学会の論文
1997-03-29