VERIFICATION OF SEDIMENT DISCHARGE BUFFER EFFECT USING THE EAST JAPAN RYPHOON 2019 CASE STUDIES

Abstract

 This study determined the resistance of sediment discharge buffering effect using case study of mass movment along a river channel in the Gofukuya River (Marumori, Miyagi Prefecture) during the East Japan Typhoon 2019. The case of the Gofukuya River was verified using spatial numerical information acquired with LP(Laser profilers) and UAV, as the aim of quantifying examples of mitigation effects against compounding phenomena that may promote severe disasters. Despite being an area of concentrated sediment and flood inundation, 25/54 (46%) tree sediment runoff buffer cases were extracted in the Gofukuya River. In the area that showed a particularly large buffer effect, the results resulted in a resistance of 43.73 kN/tree (Japanese cedar). However, the age-tree height equation indicates that the amount of tree growth in the area is significant.