Debris flow mitigation with water absorption

2015 Fiscal Year Final Research Report

• Project/Area Number: 26660120
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: Hokkaido University
• Principal Investigator: MARUTANI Tomomi 北海道大学, (連合)農学研究科(研究院), 教授 (40112320)
• Co-Investigator(Kenkyū-buntansha): KASAI Mio 北海道大学, 大学院農学研究院, 准教授 (80294966)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 土石流災害 / 水土分離 / 流速 / 衝撃力 / 実験水路 / スクリーンダム

Outline of Final Research Achievements

Aiming to debris flow mitigation, we examined water absorption form debris flow and decrease in velocity and impact force using flume experiments. The experimental flume was made by 5m long horizontal acrylic panels and debris pool at the top of the flume. As results of experiments with water absorbent, approximately 2.3 times decreasing in water content of debris flow reduce the velocity to one-half and the impact force to one-eighths. The experiments with the screen dam model has successfully shown the same results. The field survey for finding the issues of countermeasure was conducted at the screen dam site of Nojiri-river, Sakurajima. There are still issue removing the debris accumulation on the dam site.

Free Research Field

砂防