Abstract Template of the 3rd ICEC

The present study aims to investigate the characteristics of the motion of salt water and to show the temporal fluctuation of the vertical salinity distribution in Lake Jusan located in the estuary of Iwaki River in Aomori Prefecture, Japan. The Lake Jusan is the best productive water area of the shellfish, corbicula, in Japan in 2013. Then, the lake is very important in Aomori Prefecture as corbicula’s home. However, the change of the brackish environment influences the corbicula shellfish's harvest, and the shellfish harvest changes every years. Now, it is important to make clear the characteristics of the motion of salt water in the lake. In the present study, observations for the motion of the salt water going up to the lake and going down from the lake to the sea were carried out from June to September in 2015. The time change of the salinity distribution in a perpendicular direction is investigated in the present study. The vertical distributions of the salinity are shown clearly by theory and observations. And the present study shows that the movement of the saltwater in the lake can be generated well by the theory given by Sasaki, Tanaka and Umeda (2011).