Avalanche hazard mapping over large undocumented areas |
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| Authors: | M Barbolini M Pagliardi F Ferro P Corradeghini |
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| Institution: | (1) FLOW-ING Engineering, Piazza J.F. Kennedy 27, 19124 La Spezia, Italy |
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| Abstract: | An innovative methodology to perform avalanche hazard mapping over large undocumented areas is herewith presented and discussed.
The method combines GIS tools, computational routines, and statistical analysis in order to provide a “semi-automatic” definition
of areas potentially affected by avalanche release and motion. The method includes two main modules. The first module is used
to define zones of potential avalanche release, based on the consolidated relations on slope, morphology, and vegetation.
For each of the identified zones of potential release, a second module, named Avalanche Flow and Run-out Algorithm (AFRA),
provides an automatic definition of the areas potentially affected by avalanche motion and run-out. The definition is generated
by a specifically implemented “flow-routing algorithm” which allows for the determination of flow behaviour in the track and
in the run-out zone. In order to estimate the avalanche outline in the run-out zone, AFRA uses a “run-out cone”, which is
a 3D projection of the angle of reach α. The α-value is evaluated by statistical analysis of historical data regarding extreme
avalanches. Pre- and post-processing of the AFRA input/output data is done in an open source GIS environment (GRASS GIS).
The method requires only a digital terrain model and an indication of the areas covered by forest as input parameters. The
procedure, which allows rapid mapping of large areas, does not in principle require any site-specific historical information.
Furthermore, it has proven to be effective in all cases where a preliminary cost-efficient analysis of the territories potentially
affected by snow avalanche was needed. |
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