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In order to clarify formation and disappearance processes of dysoxic water mass which generates near the sea bottom at Kaita Bay, bottom mud properties which contain physical and chemical parameters and water qualities are investigated from summer season to winter season. From this investigation, it is revealed DO near sea bottom decreases when water temperature is low and turbidity increases. Generally, it is known turbidity increases causes formation of dysoxic water mass. It is estimated that the effective density (the difference between water density and suspended matter density) change by water temperature variation triggers the suspended matter motion and causes organic matter to maintain suspended condition.

Variation Characteristic of Bottom Mud Property and Water Quality at Kaita Bay