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Keiji NAKATSUJI, Masayasu IRIE and Takeshi SHIBATA There are lots of dredged hollow places in Osaka Bay, which had been dredged for reclamation at industrial areas in 1960's and 1970's.The dredged hollows make water movement stagnant and water quality worth. Dissolved oxygen is deficient near the bottom. In recent years, several times of"blue tide" which are the oxidation of hydrogen sulphide following the upwelling of anoxic water have been observed. It is not clear how much contribution such hollow places makes to declining water quality in the head of the bay. Field surveys of currents and water quality are carried out. An average current velocity is 4 cm/s in the hollows as same as that of the enclosed port area. There is not a clear difference between the water quality in the hollow places and that around the places.

Field Surveys of Currents and Water Quality around Dredged Hollow Places in Port of Han-nan, Osaka Bay