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Contenido archivado el 2024-05-07

Debris flow management and risk assessment in the Alpine region.

Objetivo

The project aims to produce a few example evaluations of Debris Flow Risk in selected areas, forecasting the occurrence and behaviour of such flows, identifying areas prone to debris flow risk in some experimental basins, and defining an exemplified methodology for the evaluation of debris flos risk in prone areas that can be used by the concerned agencies.

In order to reach the objectives some basic laboratory experiments are performed aiming to gain better
information on the mechnaical behaviour of mixtures of different grain sizes including segregation effects, and
to refine the rheological description of the transition between quasi static conditions, typical of geotechnical
analysis, and collision dominated conditions, typical of development flow behaviour, both in granular and muddy
debris flows.
Refined channel experiments are performed on free surface granular, muddy and intermediate debris-flows,
specially aimed for testing mathematical models, as well as simple experiments on possible triggering
mechanisms of debris flow.
Mathematical models representing the behaviour of debris flow are developed and implemented. 1-D and 2-D
models will be used. 2-D models may be both vertically integrated (2DH) and plane vertical flow (2DV). The
variety of models represent the effects of erosion and deposition, as well as the vertical segregation and
longitudinal differential convection mechanisms, responsible of the concentration of great boulders in the front
of the debris flood event. Models are verified and calibrated against laboratory tests and prototype data.
Field investigations are performed in order to identify debris source areas and to estimate the debris production
and accumulation rates. Debris flow events in the investigation areas are monitored and surveyed as well as their
triggering conditions (precipitation, water table elevation, initial saturation index). Precise geological,
geotechnical, geomorphologic and hydrometeorological characterisations of the investigation areas are
performed, including specific laboratory tests whenever necessary, as well as back analysis (hind-casting) and
dating of past events. A frequency-intensity relation will be established for the areas.
The areas selected for field investigation are: left slopes of Boite river valley, Veneto, Italy; subbasins of vallie
Maurienne, Savoie-France, (Saint Bernard ` Saint-Martin-la-Porte, le Pousset ` la Pousset); rio Moscardo basin,
Friuli Venezia Giulia-Italy; Schmiedlaine basin, Bayern-Germany.
At the end of these activities, the debris flow occurrence in the selected areas will be analysed using verified
and calibrated models, the implied risk will be assessed and the results translated into risk and hazard maps.

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Coordinador

UNIVERSITY OF BOLOGNA
Aportación de la UE
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Dirección
Viale del Risorgimento 2
40136 BOLOGNA
Italia

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Participantes (8)

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