Abstract
This study investigated topographic change of coastal dune and fill by tsunami overflow using hydraulic model test and aerial survey data.
In case of hydraulic model test, wide crown width of body was restrained to decline speed of crown height. In addition, this study suggested prediction formula about speed of crown height decline by connecting shear flow of tsunami over flow and speed of crown height decline.
Topographic change in Natori City before and after the Great East Japan Earthquake Tsunami suggested that wide crown width of body has erosion resistance by tsunami overflow.
