Total Investigation of Physical and Biological Environments in Isahaya Bay under the 6.27 judgement by Saga District Court

该项目的目标是详细调查流动的环境特性，对伊沙亚围堤南北闸门开启前伊沙亚湾的水质和海底质量进行了研究，为揭示闸门开启后的环境变化积累了重要而有用的数据，作为基准数据，取得的主要成果如下：1）伊沙亚湾的海底质量环境特征从湾口向湾内逐渐变差，恶化速率也逐渐增大。伊沙亚湾在雨季形成了整个区域的盐度分层，这主要是由于筑后河的排放。缺氧水团倾向于在Konagai附近生成，并在整个伊沙亚湾区域变得很大。

The objectives of this project are to investigate in details the environmental properties of flow, water quality and seabed quality in Isahaya Bay before opening the north and south gates of Isahaya reclamation dike and to accumulate significant and useful data to reveal the change in environments after opening the gates as benchmark data.The obtained main results are as follows.1)The environmental properties of seabed quality in Isahaya Bay become worse toward the inner area of bay from the bay mouth and the deterioration rate also increases toward the inner area of bay.2)The salinity stratification is formed over the whole region of Isahaya Bay in the rainy season and it is mainly due to the discharge from Chikugo River.3)The hypoxic water mass tends to be generated off Konagai and become large over the whole region of Isahaya Bay.