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Interaction between topographic conditions and entrainment rate in numerical simulations of debris flow
http://hdl.handle.net/2241/00134079
http://hdl.handle.net/2241/001340790bb3e1d3-4a3d-4412-80fa-ec65139a8091
名前 / ファイル | ライセンス | アクション |
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JMS_12-6 (721.8 kB)
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Item type | Journal Article(1) | |||||
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公開日 | 2016-01-25 | |||||
タイトル | ||||||
タイトル | Interaction between topographic conditions and entrainment rate in numerical simulations of debris flow | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Hotta, Norifumi
× Hotta, Norifumi× Tsunetaka, Haruka× Suzuki, Takuro |
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著者別名 |
堀田, 紀文
× 堀田, 紀文 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Debris flow simulations are useful for predicting the sediment supplied to watersheds from upstream areas. However, the topographic conditions upstream are more complicated than those downstream and the relationship between the topographic conditions and debris flow initiation is not well understood. This study compared the use of several entrainment rate equations in numerical simulations of debris flows to examine the effect of topographic conditions on the flow. One-dimensional numerical simulations were performed based on the shallow water equations and three entrainment rate equations were tested. These entrainment rate equations were based on the same idea that erosion and the deposition of debris flows occur via the difference between the equilibrium and current conditions of debris flows, while they differed in the expression of the concentration, channel angle, and sediment amount. The comparison was performed using a straight channel with various channel angles and a channel with a periodically undulating surface. The three entrainment rate equations gave different amounts of channel bed degradation and hydrographs for a straight channel with a channel angle greater than 21° when water was supplied from upstream at a steady rate. The difference was caused by the expression of the entrainment rate equations. For channels with little undulation, the numerical simulations gave results almost identical to those for straight channels with the same channel angle. However, for channels with large undulations, the hydrographs differed from those for straight channels with the same channel angle when the channel angle was less than 21°. Rapid erosion occurred and the hydrograph showed a significant peak, especially in cases using the entrainment equation expressed by channel angle. This was caused by the effects of the steep undulating sections, since the effect increased with the magnitude of the undulation, suggesting that a debris flow in an upstream area develops differently according to the topographic conditions. These results also inferred that numerical simulations of debris flow can differ depending on the spatial resolution of the simulation domain, as the resolution determines the reproducibility of the undulations. | |||||
書誌情報 |
Journal of mountain science 巻 12, 号 6, p. 1383-1394, 発行日 2015-11 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1672-6316 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11957323 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1007/s11629-014-3352-2 | |||||
権利 | ||||||
権利情報 | © Science Press and Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2015. The final publication is available at Springer via http://dx.doi.org/10.1007/s11629-014-3352-2 | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Science Press |