1995 年 1 巻 1 号 p. 71-92
In order to analyze the water quality, especially COD, T-P and T-N of Tokyo Bay in summer, the hydrodynamical and ecosystem coupled model we have developed was applied. The stationary state results could be obtained over 100 days time integration. For the phytoplankton abundance, COD,T-P, T-N, and inorganic nitrogen concentrations, the model could reproduce the realistic values except an inorganic phosphrous concentration whenwe adopted phytoplankton cellcomposition ratio (N/P ratio by weightin the model) to be 14in place of 8. The discrepancy could not be improved, even if we gave 10times larger phosphrous relaese rate from the sea bottom than standard rate. It maybe improved if weconsider the cell quota mechanism or different decomposition rate of organic matter for nitrogenand phosphrous. The DOC concentrations in the model showed lower values than the ones in the observations. It was implied that when the lowerdecomposition rates of DOCand POC, and changing the POC/DOC ratio in the loading from land were considered, the discrepancy could be reduced. The zooplanktonbiomass distribution showed the influence of fresh water distribution, that is, theinfluence of zero value attheriver boundary. The dominance of physical processes such as diffusion and advection compared to biological processes such as zooplankton growth rate couldbe plausible reason. In phytoplankton case, suchproblem does not occur because of biological processes dominance (high turnover rate).