Centennial to Multi-Decadal Morphology Change and Sediment Budget Alteration with Consideration of the Impacts of the 2011 Tohoku Earthquake Tsunami along the Nobiru Coast, Japan

The Nobiru Coast is situated on the southwest of Ishinomaki Bay. 2011 Great East Japan Tsunami severely devastated and adjacent Naruse River mouth. In this study, an investigation was conducted based available historic maps images combined with in situ surveys that revealed century-to-decade morphology change sediment budget alteration Coast. During past two centuries, longshore transport northeast coast supply from were principal onto estimated annual net input into 87,000 m3/y. Until several decades ago, construction Port erosion preventing constructions (breakwaters, headlands) along Ohmagari areas caused a dramatic reduction to Hence, fell 46,000 After tsunami, further reduced 29,000 m3/y loss closely related intruded River. outcomes study are highly valuable for government authorities manage long-term coastal riverine morphological changes after tsunami.