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Title: 山地河床における岩盤形状と巨礫の土砂流出に及ぼす影響
Other Titles: Influences of bedrock projections and large rocks on sediment transport in a mountainous gorge channel
Authors: 金, 鈴宇1 Browse this author
後藤, 健2 Browse this author
全, 槿雨3 Browse this author
丸谷, 知己4 Browse this author →KAKEN DB
Authors(alt): Kim, Suk Woo1
Goto, Ken2
Chun, Kun Woo3
Marutani, Tomomi4
Keywords: steep mountainous stream
bedrock channel
bedrock projection
large rocks
sediment transport
Issue Date: Nov-2008
Publisher: 砂防学会
Journal Title: 砂防学会誌
Volume: 61
Issue: 4
Start Page: 3
End Page: 11
Publisher DOI: 10.11475/sabo.61.4_3
Abstract: Steep mountainous streams are often characterized by bedrock channel, which temporally causes sediment storage and scouring due to channel obstructions, such as bedrock projection and large rocks. In this paper, the influence of bedrock projection and large rocks on long-term riverbed changes with sediment transport was statistically examined in a mountainous gorge channel. Oyabu Creek, Kyushu, Japan. This study was conducted based on the 12-years field monitoring during 1995 and 2007 in a steep mountainous stream, and sediment deposit, scouring, and variation depth with mean bedrock projection area, bedrock relief (wetted perimeter/channel width) and the volume and number of large rocks are calculated from these data and field measurement in 2006. As a result, both of sediment deposit, scour and variation depth were increased with increasing in mean bedrock projection area and volume of large rocks rather than bedrock relief and the number of large rocks. Furthermore multiple correlation analysis of mean bedrock projection area and volume of large rocks with sediment variation depth show high correlation coefficient. Comparing changes in sediment storage depth between bedrock projection segment and non-projection segment implies that bedrock projection segment caused considerable sediment storage with alternatively deposit and scouring dominated periods within 3 years. These results suggest that mean bedrock projection area and the volume of boulders play an important role on sediment transport providing channel bed relief in a steep mountainous stream.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 丸谷 知己

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