JDR Vol.2 No.1 pp. 11-18
doi: 10.20965/jdr.2007.p0011


Review of Research Related to Sediment Disaster Mitigation

Shinji Egashira

Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan

December 13, 2006
January 9, 2007
February 1, 2007
sediment-related disaster, landslides and debris flow, countermeasures against sediment hazards, governing equations of debris flow, numerical simulation of debris flow
The annual number of deaths resulting from landslides and debris flow in Japan over the past 40 years has shown a decreasing tendency as corresponding countermeasures are implemented. The countermeasures constituted of structural and non-structural methods are introduced, focusing on their phenomenological function to clear up roles of sediment research on them. In addition, governing equations which are employed currently in numerical predictions are shown, including formulas for bed shear stress and sediment erosion and deposition in order to illustrate differences between the flow of water and sediment mixture in steep areas and the flow of usually observed floods in rivers. It is recommended that equations which are able to distinguish rapid changes of flow characteristics due to internal solid type friction, sediment erosion and deposition and the corresponding changes of bed elevation should be applied in the numerical computations.
Cite this article as:
S. Egashira, “Review of Research Related to Sediment Disaster Mitigation,” J. Disaster Res., Vol.2 No.1, pp. 11-18, 2007.
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