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| Titel |
Hydraulic characteristics of debris flows in a drainage channel with stepped dissipater |
| VerfasserIn |
Huayong Chen, Xiaoqing Chen, Wanyu Zhao |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140906
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| Publikation (Nr.) |
 EGU/EGU2017-4358.pdf |
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| Zusammenfassung |
| Sichuan-Tibet railway started from Chengdu, via Pujiang, Ya’an, Kangding, Litang,
Zuogong, Bomi, nyingchi, and lhasa, which covers a distance of 1,629 km. The
Sichuan-Tibet railway cuts through the alpine region that has the feature of large elevation
difference, active tectonics, and obvious space differentiation. Debris flows with high density,
low viscosity, and high speed are one of the most common geo-hazards in these regions. A
new type of drainage channel with stepped dissipater was proposed to apply to mitigate the
debris flow disaster in the alpine region. The debris flow patterns, debris flow velocity, energy
dissipation along the drainage channel were analyzed under different structures of the
drainage channels based on the experiments. The roughness coefficient calculated by the
Manning formula was also investigated along the flow depth for both rectangular channel and
the channel with stepped dissipater. The results indicated that compared with the
traditional rectangular drainage channel, the channel with stepped dissipater has
more efficiency to decrease the flow velocity, Reduce the abrasion along drainage
channel, and improve the energy dissipation rate due to the Intense collision, friction
between debris flows and the solid boundary. The maximum energy dissipation rate
reaches approximately 61%. Based on the theory of particle projectile, the relation
between the step length and the debris flow velocity, step height was proposed.. |
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