Sediment supply processes from large-scale landslides

2014 Fiscal Year Final Research Report

• Project/Area Number: 24780141
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: Shizuoka University
• Principal Investigator: IMAIZUMI Fumitoshi 静岡大学, (連合)農学研究科(研究院), 准教授 (80378918)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 大規模崩壊地 / 土砂生産 / 凍結融解 / 崩壊 / レーザー測量 / 砂泥互層

Outline of Final Research Achievements

Large scale landslides continuously supply sediment after their initial failure. In this study, we investigated timing and volume of sediment supply by field surveys and GIS (Geographic Information System) analyses. Sediment supply from hillslopes were composed of multiple sediment supply processes, including chronic weathering of the bedrock and episodic slope failure expanding the landslide. Spatial activities of these processes were highly affected by the geological structure in the landslide. We successfully explained sediment supply processes by "parallel retreat model" and "slope stability model for the slopes with multi-layer geoligical structure."

Free Research Field

砂防工学