Abstract
This study investigates water-level oscillation and ice breakup in the Lake Akkeshi by the tsunami caused by the 2011 Tohoku Pacific-Coast Earthquake. We conducted 2D numerical analysis in order to simulate the tsunami intrusion into the semi-closed lake and temporal and spatial water-level fluctuations are clarified. Then we measured the sizes and areas of lake ice by GIS analysis to compare these with the results from other sea ice size measurement and attempted to clarify the difference in sizes from ice formed in sea ice zones. The importance of significant effect of tsunami intrusion on lake ice breakup is elucidated.
