TIME SERIES OF SCOUR DEPTH BEHIND VERTICAL SEAWALL DUE TO OVERFLOW

Abstract

 As a result of the Great East Japan Earthquake, coastal structures were submerged by the tsunami. Part of these structures were scoured, resulting in a reduction of the bearing capacity of these structures. As a result, some caissons were moved and some of them were collapsed, although the actual tsunami water depth did not exceed the threshold which can slide the caisson. For designing of a robust structure, the investigation of the influence against scours behind the seawall due to tsunami is important. Although many studies has conducted the estimation of the maximum scour depth, few studies actually have investigated the relationship between overflow time and scour depth.Therefore, the purpose of this study is to design an experimental equation that can evaluate the time evolution of scour depth.