Abstract

In examining the seasonal variation of water qualities and ecological characteristics, it is of great importance to establish eco-system numerical modelling accompanied with 3-D baroclinic flow model. The model describes the biological and chemical processes in the estuarine lower trophic eco-system in terms of chlorophyll-a, inorganic nitrogen, inorganic phosphorus, organic nitrogen, organic phosphorus, COD, DO. The model performance in simulating seasonal variation of water qualities in Osaka Bay can be conformed through the field data. In particular, the increase in phyto-plankton in the bay head is dependent of upwelling of nutrients in lower layer transported by the estuarine circulation.

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