2次元直交座標系での港湾内流れの流動拡散モデルについて : 水質モデル構築のための予備的考察として

抄録

In the water pollution concentration computation model with general curvilinear coordinate system to have used up to this (for example, a 3-D Ise Bay simulator made by S.Chiba ), when there is a protrusion on the bottom of the sea, it is possible to compute along the topography of the bottom. In such a case it is very effective, but the other side, the basic equations with general curvilinear coordinate system are inconvenient to become complicated and not to treat simply. In the case of 2 -D topography, it will be enough in analysis which used an water pollution concentration computational model by the 2-dimensional Cartesian coordinates. Therefore, we newly developed the simplified computer program which solves a tidal velocity phase and a dissolved oxygen diffusion phase alternately in the time marching formula in the 2-dimensional Cartesian coordinates. It is assumed that a harbour with a mouth which sea water from outside the harbour enters has a small-sized river. We calculated the diffusion process of dissolved oxygen carried by the inflow and outflow variability for tidal movement and river discharge.