 |
| Titel |
Characterisation of the surface morphology of an alpine alluvial fan using airborne LiDAR |
| VerfasserIn |
M. Cavalli, L. Marchi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 2 ; Nr. 8, no. 2 (2008-04-11), S.323-333 |
| Datensatznummer |
250005412
|
| Publikation (Nr.) |
 copernicus.org/nhess-8-323-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| Alluvial fans of alpine torrents are both natural deposition areas for
sediment discharged by floods and debris flows, and preferred sites for
agriculture and settlements. Hazard assessment on alluvial fans depends on
proper identification of flow processes and their potential intensity. This
study used LiDAR data to examine the morphology of the alluvial fan of a
small alpine stream (Moscardo Torrent, Eastern Italian Alps). A
high-resolution DTM from LiDAR data was used to calculate a shaded relief
map, plan curvature and an index of topographic roughness based on the
standard deviation of elevation within a moving window. The surface
complexity of the alluvial fan, also influenced by human activities, clearly
arose from the analysis. The surface roughness, defined here as the local
topography variability, is compared with a previous classification of the
fan surface based on field surveys. The results demonstrate that topographic
analysis of ground based LiDAR DTM can be a useful tool to objectively
investigate fan morphology and hence alluvial fan hazard assessment. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|