Numerical Simulation of Pollution in Omura Bay

The pollution of a bay can be rated by the chemical oxygen demand, COD. One mechanism to cause COD increase in the bay is the direct inflow of it with the water of river. The distribution of COD is also controlled by the exchange of water between the bay and ocean. The distribution of COD is calculated by solving the simultaneous partial differential equation numerically by taking all these factors into account (first COD). The other one is due to plankton which is controlled by the amount of phophrous (second COD). In this paper, the calculated results of these two sources of COD are respectively discribed. Then the sum of them are compared with the measured value of COD