The Tokyo port area, which is a tidal area situated between The Sumida River and Tokyo Bay, was investigated for two years for the purpose of revealing the water dynamics and water quality.
The results are summarized as follows.
(1) Strong stratification owing to the difference of density was formed at about 5 meters depth from April to September.
(2) As water temperature rose, surface water became turbid and particulate organic carbon and chlorophyll-a increased and became about ten-fold and one hundred-fold as much as in winter respectivly, which was similarly observed generally in a eutrophic lake or innar bay.
(3) At the low tide fresh water from the Sumida River flowed down along west side piers in the port and sea water rose through the central part of channel at the high tide.
(4) The fresh water was eutrophic also, and the ratio of particulate organic carbon to chlorophyll-a was about 60 in summer, almost the same as that of phytoplankton,
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