Debris-flow Runout Distance:
Laboratory Experiments On The Role Of
Bagnold, Savage And Friction Numbers
Author(s)
F. Bettella, T. Bisantino, V. D’Agostino & F. Gentile
Abstract
An experimental apparatus, consisting of a tilting flume and a final horizontal
plane, has been used to investigate the depositional features of debris materials
collected from the Pulsano watershed (Southern-Italy). Experiments have been
carried out to study the flow behaviour of mixtures at sediment concentrations
0.4≤Cv≤0.6 and maximum grain size of the particles 4mm≤d≤19mm. The flow
behavior is described on the basis of the evolution of the front position in the
channel and of the runout distance, lateral spreading and flow depth in the
horizontal plane. An attempt is made to rate the experimental flows according to
the classification of flow regimes based on threshold values of dimensionless
Bagnold, Savage and Friction numbers. As a conclusion the experimental results
highlight a threshold behaviour of debris-flow mixtures in the runout phase. This
results from a particular combination of maximum grain diameters in play and a
volumetric concentration limit. When approaching such combination the shape
and the maximum length of the deposit change drastically if compared to those
of the inertia-dominated regime.
Keywords: debris flow, small scale experiments, flow regime.
1 Introduction
The estimation of the spreading of debris-flows on alluvial fans has a major role
in assessing debris-flow hazards. Laboratory tests on small-scale models are a
Keywords
debris flow, small scale experiments, flow regime.
Related Book
Other papers in this volume
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