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2017 | OriginalPaper | Chapter

Small Flume Experiment on the Influence of Inflow Angle and Stream Gradient on Landslide-Triggered Debris Flow Sediment Movement

Authors : Hefryan Sukma Kharismalatri, Yoshiharu Ishikawa, Takashi Gomi, Katsushige Shiraki, Taeko Wakahara

Published in: Advancing Culture of Living with Landslides

Publisher: Springer International Publishing

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Abstract

Rainfall-induced landslide might transformed into more severe disaster, namely debris flow and natural dam which both holds serious threats on human life and material. The runout distance has crucial role for determining affected areas of a landslide. Our previous research found the correlation of inflow angle and stream gradient to transformation of landslide collapsed sediment either into natural dam or debris flow. This research intended to test our previous research result with a small flume experiment and aimed to analyze the influence of sediment inflow angle and stream gradient to the sediment deposition percentages as representative of runout distance and the possibility of natural dam formation. Soil samples were taken from landslide-triggered debris flow disaster initiation zone in Hiroshima (Hiroshima Pref.) and Izu Oshima (Tokyo Pref.), Japan which were induced by heavy rainfall. The small flume was 10 cm width and 15 cm height, the inflow segment angle was varied to 60° and 90°, and the stream segment gradient was varied to 10° and 15°. From the experiment results, stream gradient influence the sediment movement effectively rather than inflow angle, and it was sufficient to examine the possibility of collapsed sediment to form natural dam or debris flow. Soil samples from natural dam initiation zones and consideration of water content factor are essential for further experiment.

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Title: Small Flume Experiment on the Influence of Inflow Angle and Stream Gradient on Landslide-Triggered Debris Flow Sediment Movement
Authors: Hefryan Sukma Kharismalatri
Yoshiharu Ishikawa
Takashi Gomi
Katsushige Shiraki
Taeko Wakahara
Publisher: Springer International Publishing
Book: Advancing Culture of Living with Landslides
Print ISBN: 978-3-319-53482-4

Electronic ISBN: 978-3-319-53483-1

Copyright Year: 2017
DOI: https://doi.org/10.1007/978-3-319-53483-1_61

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