Author(s): Vo Cong Hoang; Yuta Mitobe; Hitoshi Tanaka
Keywords: EOF; Recovery; Morphology; Shoreline; Tsunami
Abstract: The Great East Japan Earthquake Tsunami, which occurred on March 11 th, 2011, caused significant changes to the coastal and estuarine morphology on Sendai Coast, Miyagi Prefecture, Japan. Although the recovery process of sandy beach took place subsequently after the tsunami, it still can be observed even 3 years after the tsunami. The long-term effect of such a severe morphology change on sediment transport system is investigated through the analysis of aerial photographs. Empirical Orthogonal Function (EOF) analysis is applied to shoreline positions extracted from the aerial photog raphs. The first component expresses the recovery process of shoreline from the severe erosion, and its contributed rate is almost70%. The comparison of shoreline change rate before and after the tsunami clearly shows that the recovery process of severe eroded area caused completely different trend of sediment transport process.