Numerical Simulation of Water Quality in Tokyo Bay in Summer using Biological model

A biological model has been developed to simulate the water quality in a bay. The model is ahydrodynamical and ecological coupled model, and the ecological model includes the biological processin the bottom sediment. The vertical diffusivity is estimated by κ-ε turbulence model to simulate thevertical transport process with high accuracy. The model was applied to Tokyo Bay in summer, which isa typical eutrophicated bay in Japan. The numerical results showed good agreement with the observeddata. The model can simulate the formation of oxygen poor water in the bottom layer, which is the mostserious environmental problem in Tokyo Bay