Study on re-suspension, transport, and settlement processes of particulate matter in an estuarine environment under multi-scale effects

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This study aims to clarify the mechanisms of mass transport in a network of canal around Tokyo Bay by taking into account multi-scale effect on flow field, which is considered one of the most complicated network systems in Japan. In the analysis, three-dimensional numerical computation and vertically integrated two-dimensional numerical computation models were applied in order to reveal energy transfer and mass transport in a stratified flow field. In the field observation, salinity and dissolved oxygen were measured with the interval of 10min for a few months at several stations, such as Higashi-Ogijima, Chiba-Tohyo and Tokyo Port, which reveals that water quality in Chiba-Tohyo influences in Tokyo Port and Higashi-Ogijima. On the other hand, field observation regarding dissolved oxygen demonstrated that anoxia in canal does not have any relation with that in the bay head because of the discontinuity of stratification effect. Therefore, it is found to be necessary to evaluate the structure of stratification in order to clarify the influential region when you analyze mass transport in multi-scale stratified flow field.