抄録
The behaviors of hypoxic water mass in Isahaya Bay have been investigated by analyzing the data of water quality and wind measured from June to September of 2009 by the Kyushu Regional Agricultural Administration Office. The front of hypoxic water mass responds sensitively to wind and tends to be perpendicular to the prevailing wind direction. When the southerly wind blows, the low density water mass near the water surface, which is rich of dissolved oxygen, is transported to the mouth of Isahaya Bay and the hypoxic water mass near the seabed is transported to the inner area. On the other hand, the northerly wind drifts the water mass near the water surface to the inner area and the hypoxic water mass near the seabed moves to the offshore direction. The continuous blowing of the southerly wind decreases the concentration of dissolved oxygen in the inner area, and that of the northerly wind increases it.
