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発表 Method to predict sediment runoff resulting from landslides and debris flows

作成年度 2018 年度
論文名 Method to predict sediment runoff resulting from landslides and debris flows
論文名(和訳)
論文副題
発表会 The 9th International Conference on Scour and Erosion
誌名 Scour and Erosion
巻・号・回 IX
発表年月日 2018/11/05 ~ 2018/11/08
所属研究室/機関名 著者名(英名)
ICHARMY. Yamazaki
ICHARMS.Egashira
ICHARMN.Nagumo
抄録
Present study proposes a method for predicting sediment runoff volume at each stream channel in mountainous drainage basins during heavy rainfalls, combining an occurrence model of landslides and a runoff process model of soil blocks. The proposed method is applied to the Akatani drainage basin which was severely damaged owing to landslides and debris flows in the northern Kyushu rainfall event in July 2017. The simulated sediment runoff volume ranges from 0.5 to 2 times to the sediment runoff estimated by the differences in elevation before and after the disaster. The result shows the sediment runoff is determined not only by the spatial distribution of landslide and the gradient of the river channel but also by the content ratio of the fine sediment that specifies the equilibrium gradient of debris flows.
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