The river mouth delta of this study is located on the center of the easterncoast of Ariake Bay, Kumamoto, Japan. Two earthquakes scaled of 7on the Japanese scale struck Kumamoto Prefecture on April 14 and 16,2016, and then about the 0.4 m ground subsidence was occurred. Alarge amount of sediment from the Shirakawa River was discharged intothe river delta due to a following-flood. The clinoform along the waterrouteapproximately propagated 150 m in the offshore direction and thebed level increased by about 1.5m. The estimated sediment dischargewas 1.1×105m~3/yr./km~2 during 2014 to 2016, corresponds four timesduring 1978 to 1997.
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