A Field Survey of Geomorphic Change on Kesennuma Bay cased by the 2010 Chilean Tsunami and the 2011 Tohoku Tsunami

Abstract

We conducted a bathymetric survey at Kesennuma Bay in Miyagi-prefecture before and after the 2010 Chilean Tsunami and the 2011 Tohoku Tsunami, and measured detailed 3D bathymetric data. Based on the survey data, we confirmed geomorphic characteristic on Kesennuma Bay and geomorphic changes due to recent two tsunamis in 2010 and 2011. And we provide quantitative analysis of these geomorphic changes, analyzed the relation to the character of each tsunamis, and studied the sediment transport characteristic.