Abstract
This study carried out an annual flow simulation in Lakes Shinji and Nakaumi. The aim of this study is to verify that effects of horizontal mesh size gives on the calculated salinity intrusion. We used numerical model "STOC-LT", and prepared the two case mesh sizes of 200m and 400m. We computed a flow of connected model of Lakes Shinji and Nakaumi until December 31, 2013 from January 1, 2012. In the calculation result, a reproduction of water level and temperature were consistent. But, calculated salinity in 200m and 400m mesh size was overestimated than observation. The calculation of the salinity change is smaller than observation in Ohashi river. Therefore the numerical model is easy to become state of the weak stratification. The flux of 400m mesh is about 2 times of 200m mesh in Ohashi river. It is thought that if using a small mesh size makes flow volume reduce.
