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REALIZZAZIONE DI UN DISPOSITIVO AUTOALIMENTATO PER IL MONITORAGGIO DELLA PRESTAZIONE SPORTIVA NEL NORDIC WALKING
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Numerical simulation of real debris-flows events
Full text linkA one-dimensional model is presented to
predict debris-flow runouts. The model is based on shallow
water type assumptions. The fluid is assumed to be
homogeneous and the original bed of the flow domain to be
unerodible. The fluid is characterized by a rheology of
Bingham type.
A numerical tool able to cope with the nature of debris
flows has been worked out. It represents an extension of a
second order accurate and conservative method of
Godunov type. Special care has been devoted to the
influence of the source terms and of the geometrical
representation of the natural cross sections, which play a
fundamental role.
The application concerns a monitored event in the
Dolomites in Italy, where field analyses allowed a
characterization of the behavior of solid-liquid mixture as a
yield stress material. The comparison between numerical
simulations and field observations highlights the
impossibility of representing all phases of the flow with
constant values of the rheological parameters. Nevertheless
the results show that it is possible to separately represent
the phase of the flow in the upstream reach and the phase of
the deposition in the alluvial fan, with a good agreement
with field observations
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