Abstract
A semi-enclosed bay frequently causes water environmental problems such as red tide and hypoxia because it has little exchange with the ocean. Therefore it is important to estimate the exchange time in the bay. In this research, we considered average exposure times using a numerical model in Ise Bay. The average exposure times were calculated by river discharge (river method) and solving a convection-diffusion equation using virtual dyes (dye method). The average exposure times and its seasonal changes of the two methods were significantly different each other. It suggests that the seasonal changes of the average exposure time by river method may lead to a misinterpretation. In addition, it was implied that an estuarine front has an important effect on the seasonal changes in the average exposure time.
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