 |
| Titel |
Rockfall hazard mapping along a mountainous road in Switzerland using a GIS-based parameter rating approach |
| VerfasserIn |
F. Baillifard, M. Jaboyedoff, M. Sartori |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 3, no. 5 ; Nr. 3, no. 5, S.435-442 |
| Datensatznummer |
250001240
|
| Publikation (Nr.) |
 copernicus.org/nhess-3-435-2003.pdf |
|
|
|
|
|
| Zusammenfassung |
| A posteriori studies of rock slope
instabilities generally show that rockfalls do not occur at random
locations: the failure zone can be classified as sensitive from
geomorphological evidence. Zones susceptible to failure can there-fore be
detected. Effects resulting from degrading and triggering factors, such as
groundwater circulation and freeze and thaw cycles, must then be assessed
in order to evaluate the probability of failure. A simple method to detect
rock slope instabilities was tested in a study involving a 2000 m3
rockfall that obstructed a mountainous road near Sion (Switzerland) on 9
January 2001. In order to locate areas from which a rock-fall might
originate, areas were assessed with respect to the presence or absence of
five criteria: (1) a fault, (2) a scree slope within a short distance, (3)
a rocky cliff, (4) a steep slope, and (5) a road. These criteria were
integrated into a Geographic Information System (GIS) using existing topo-graphic,
geomorphological, and geological vector and raster digital data. The
proposed model yields a rating from 0 to 5, and gives a relative hazard
map. Areas yielding a high relative hazard have to meet two additional
criteria if they are to be considered as locations from which a rockfall
might originate: (1) the local structural pattern has to be unfavourable,
and (2) the morphology has to be susceptible to the effects of degrading
and triggering factors. The rockfall of 9 January 2001, has a score of 5.
Applied to the entire length of the road (4 km), the present method
reveals two additional areas with a high relative hazard, and allows the
detection of the main instabilities of the site. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|