Some observations on the prediction of the dynamic parameters of debris flows in pyroclastic deposits in the Campania region of Italy |
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Authors: | Anna Scotto di Santolo Aldo Evangelista |
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Institution: | (1) Dipartimento di Ingegneria Geotecnica, Università degli Studi di Napoli Federico II, Via Claudio 21, 80125 Naples, Italy |
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Abstract: | Over the last 20 years, many tools have been developed for the prediction of the post-failure behaviour of rapid landslides.
However, as pointed out by several researchers, knowledge may be improved by the performance of back-analyses using different
models and the evaluation of their reliability. This paper reports the back-analysis, conducted using numerical models, of
57 rapid landslides that have occurred in the Campania region. The back-analysis has been performed using the 2-D DAN_W code
(version 2003) with two different rheological models: the Voellmy and the frictional models. The latter has been immediately
discarded because it did not match the observed data. Instead, using the Voellmy model, the best-fit values of the parameters
(friction μ and turbulence ξ) for different types of flow (channelled, un-channelled and mixed flows) have been researched.
With these values a parametric study has been carried out on four representative slope profiles of the Campania region, enabling
the prediction of runout, velocity and depth of flow (dynamic parameters) of potential debris flows.
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Keywords: | Debris flows modelling Runout Dynamic parameters Risk mitigation Volcanic soil Rheometer |
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