Surge Occurrence Condition and Flow Models of Muddy Debris Flow

Arai, Muneyuki; Mizuyama, Takahisa

doi:10.2208/jscejhe.67.92

Cited by 1 publication

(2 citation statements)

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“…. For uniform sediment concentration and rectilinear flow, the velocity distribution u is obtained as follows (Arai & Mizuyama 2011a):…”

Section: O C C U R R E N C E C O N D I T I O N O F Ro L L Wav E S F Omentioning

confidence: 99%

“…Prediction of parameters like wave length and wave celerity needs an in-depth analysis of wave propagation in shallow water flows, which would go beyond the scope of this contribution and is therefore not discussed in this paper. Here, we derive new theoretical criteria for the occurrence of roll waves (Section 2) which are based on the theory of Dressler (Arai & Mizuyama 2011a) and connect them with three flow models that have been developed for describing the flow behaviour of concentrated grain-fluid mixtures like debris flows and debris floods (Section 3). The novelty of our approach is that the stability criterion includes a dependence on the shape of the flow cross-section, the friction factor and importantly the momentum correction factor for the velocity profile.…”

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confidence: 99%

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Occurrence conditions of roll waves for three grain–fluid models and comparison with results from experiments and field observation

Arai

Huebl²,

Kaitna³

2013

Geophysical Journal International

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For the flow and deposition behaviour of debris flows, phenomena like particle sorting, levee formation and the development of roll waves are expected to be important processes. However, these processes are not well understood and hardly implemented in modelling approaches. In this study, we focus on the development of roll waves and derive advanced criteria separating stable and instable flow regimes for three debris flow models. These criteria are expressed using critical Froude numbers. Each of these simple flow models reflect different sources of flow resistance: laminar-viscous stress (Bingham type), dispersive stress due to particle collision (Bagnold type), and a model combining turbulent and dispersive stresses. Subsequently, we compare the predictions from these models with results from laboratory experiments with grain-fluid mixtures in a straight flume and with observations from a debris flow monitoring site at the Lattenbach creek in Austria. The experimental flows match with a turbulent flow model including particle collisions. For the natural flows the connection between models and observations is not clear due to limited field data. The results of our study contribute to an improved determination of critical flow conditions and provide data for model testing.

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“…. For uniform sediment concentration and rectilinear flow, the velocity distribution u is obtained as follows (Arai & Mizuyama 2011a):…”

Section: O C C U R R E N C E C O N D I T I O N O F Ro L L Wav E S F Omentioning

confidence: 99%

mentioning

confidence: 99%

Occurrence conditions of roll waves for three grain–fluid models and comparison with results from experiments and field observation

Arai

Huebl²,

Kaitna³

2013

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

Surge Occurrence Condition and Flow Models of Muddy Debris Flow

Cited by 1 publication

References 10 publications

Occurrence conditions of roll waves for three grain–fluid models and comparison with results from experiments and field observation

Occurrence conditions of roll waves for three grain–fluid models and comparison with results from experiments and field observation

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