Author(s): Takuya Sakuraba, Yasuo Nihei, Yuki Kurakami
Linked Author(s): Yasuo Nihei
Keywords: 2016 Kumamoto earthquake, flood disaster, dike, compound disaster, sandbag
Abstract: This study aims to understand the compound disaster at the Kiyamagawa River during the 2016 Kumamoto earthquake and the subsequent flooding in June 2016. Two field surveys had been carried out: one, to study the levee damage during the earthquake, and another, to understand the extent of flood inundation and levee damage at the Kiyamagawa River. The Kumamoto earthquake has caused extensive longitudinal and transverse cracks and crest subsidence of the levee in the water system of the Midorigawa River as well as the Akitsugawa and Kiyamagawa Rivers. The compound disaster around the Kiyamagawa River has occurred as a result of the heavy rain; the rain has caused the levee to collapse, and, in turn, the levee breach has led to flood inundation. In addition to the failure of the sandbags, which have been placed as a countermeasure to crest subsidence, the surveys have revealed the possibility of the sandbags collapsing owing to the piping directly below them
Year: 2017