BAS I C STUDY ON I MPACT FORECAST TO THE BEHAV I OR OF HYPDX I C WATER AROUN THEDREDGED HOLLOWS NEAR MUROMI RIVER MOUTH IN HAKATA BAY

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IIn this study, we discuss about how the hypoxic water spread to the Hakata Bay and how the sediment characteristics changes in effect on the hypoxic water, especially concerning two dredged hollows placed at the Muromi River mouth. Eastern long along-shelf transects, northern long off-shelf transects and horizontal grid transects were taken to observe water and sediment quality.These results indicated that hypoxic water spilled out and spread from these hollows mainly at the Flood tide. And the behavior of the hypoxic water tends to move to the north east direction throughout the day. Hypoxia spilled out from the dredged hollow affected to the migration of such species and it may decrease biodiversity in the Hakata Bay.