書誌事項
- タイトル別名
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- Influence of particle-size segregation in multi-granular debris flow on the fluidity
- コンゴウ リュウケイ ドセキリュウ ニ オケル フンキュウ ゲンショウ ガ リュウドウ トクセイ ニ オヨボス エイキョウ
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抄録
Understanding the flow characteristics of a debris-flow front is essential for evaluating the impact force and predicting the attainable time of the debris flow. However, the fluidity of the front has not been examined experimentally for either mono- or multi-granular debris flows. This study conducted flume tests of debris flows consisting of sediment particles that were either monogranular or a mix of two diameters and compared the results with numerical simulations. Particlesize segregation was examined in the mixed-diameter experiments using a high-speed video camera and five debris-flow samples obtained from the front edge of the debris flow at ca.0.5-second intervals. The experimental and calculated results showed good agreement for the monogranular debris flows in terms of flow depth, front velocity, and fluxes, whereas disagreement was seen in the mixed-particle-size debris flows. The disagreement was thought to arise from the dominant shear stress resulting from the concentration of smaller sediment particles in the lower layer of the flow due to inverse grading detected in the body of the debris flows. Additionally, the calculated velocity of the front was underestimated compared with the actual velocity, as the particle-size segregation at the front of multi-granular debris flows did not affect the fluidity in the initial and developing phases.
収録刊行物
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- Journal of the Japan Society of Erosion Control Engineering
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Journal of the Japan Society of Erosion Control Engineering 66 (3), 13-23, 2013
公益社団法人 砂防学会
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詳細情報 詳細情報について
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- CRID
- 1390282680456690304
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- NII論文ID
- 10031200130
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- NII書誌ID
- AN0012035X
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- ISSN
- 21874654
- 02868385
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- NDL書誌ID
- 024897312
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可