Numerical Calculation of DO Distribution in Yashima Bay, Japan

Abstract

A Mathermatical model was developed to predict the spread of oxygen. This model was considered in well mixed water on the basis of mass balance equation. The effects of source and sink of dissolved oxygen such as advection, diffusion, reaeration and consumption of biomass were applied into the mathematical model. Since the experiments were done in the night time, the effect of primary production could be neglected. The solution of the model which was developed by Horiguchi (1969) had been considered by the scheme of implicit method. Successive over relaxation method (S.O.R) was selected for use. In the DO dispersion model, the velocity data were obtained from the results of Monton, A. and Sasaki, T.(1995)’s studies. These terms were applied to all quality constituents of sea water. The local addition and removal of the DO terms obtained from the results of Inoue’s biological experiments (1983-1987). Each term was introduced into the suitable investigation area. The results of the prediction are nearly the same as the observation. Similar to its spread, the pattern of DO dispersion from the prediction at low tide is also similar to the pattern of DO dispersion from observation at low tide.