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The river mouth morphology changes in the Samega wa river mouth during its recovery following The Great East Japan Tsunami of 2011 was investigated i n this study by analyzing the water level data and aerial photo. The aerial photos provide valuable in formation on the changes. However, their availabili ty s 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 narr owing, as well as the river mouth opening has been successfully detected. The assessed parameters corr esp nd well with the condition obtained from the aerial photo analysis when available. In addition, these parameters also provide information on the ri ver mouth condition when there are no aerial photo data . The proposed method in this study will provide an efficient way for analyzing and evaluating the morp hology changes at a river mouth.

INVESTIGATION OF THE RIVER MOUTH MORPHOLOGY CHANGES IN SAMEGAWA RIVER INDUCED BY THE 2011 GREAT EAST JAPAN EARTHQUAKE TSUNAMI