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The river mouth morphology changes in the Samegawa river mouth during its recovery following The Great East Japan Tsunami of 2011 was investigated in this study by analyzing the water level data and aerial photo. The aerial photos provide valuable information on the changes. However, their availability is limited. The correlation coefficient and the linear gradient between the water level data in the river and the tidal level were analyzed. The river mouth narrowing, as well as the river mouthdoi:10.2208/jscejhe.69.i_265 fatcat:zp57r5gjm5fl3pqbgact334i7m