 |
| Titel |
An example of debris-flows hazard modeling using GIS |
| VerfasserIn |
L. Melelli, A. Taramelli |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 4, no. 3 ; Nr. 4, no. 3 (2004-05-28), S.347-358 |
| Datensatznummer |
250001687
|
| Publikation (Nr.) |
 copernicus.org/nhess-4-347-2004.pdf |
|
|
|
|
|
| Zusammenfassung |
| We present a GIS-based model for predicting debris-flows occurrence. The availability of
two different digital datasets and the use of a Digital Elevation Model (at a given scale)
have greatly enhanced our ability to quantify and to analyse the topography in relation to
debris-flows. In particular, analysing the relationship between debris-flows and the
various causative factors provides new understanding of the mechanisms. We studied the
contact zone between the calcareous basement and the fluvial-lacustrine infill adjacent
northern area of the Terni basin (Umbria, Italy), and identified eleven basins and
corresponding alluvial fans. We suggest that accumulations of colluvium in topographic
hollows, whatever the sources might be, should be considered potential debris-flow
source areas. In order to develop a susceptibility map for the entire area, an index was
calculated from the number of initiation locations in each causative factor unit divided by
the areal extent of that unit within the study area. This index identifies those units that
produce the most debris-flows in each Representative Elementary Area (REA). Finally,
the results are presented with the advantages and the disadvantages of the approach, and
the need for further research. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|