Abstract
In order to analyze the processes contributing to the formation of oxygen depleted waters and the subsequent probability of occurrence of hypoxia and anoxia in the inner Hakata Bay, a combined hydrodynamic and eutrophication model was developed. Comparison of yearlong calculation results with monitoring data shows that the model could represent reasonably the important features regulating water quality and dissolved oxygen of the bay. Hypoxia and anoxia are developed in the bottom waters in summer due to the presence of stratification caused by freshwater inflow and meteorological conditions and are most severe during August. The ongoing land reclamation work has insignificant impact on water quality, but it prolongs the duration of hypoxia and anoxia in the bay.
