approccio analitico per la valutazione della pericolosità da frana: l’esempio di un’area di
DESCRIPTION
Approccio analitico per la valutazione della pericolosità da frana: l’esempio di un’area di El Salvador (C.A.). TASKS. - Define causes and typology of landslides - Individuate and map all the landforms indicating instability conditions or that can control slope processes - PowerPoint PPT PresentationTRANSCRIPT
Approccio analitico per la valutazione della pericolosità da frana: l’esempio di un’area di
El Salvador (C.A.)
DATABASE AND ACTVITIES- bibliographic data collection and analysis;- vectorized geological map;- geological and geomorphological field control;- aerial view (helicopter);- vectorized aerial photographs analysis;- vectorized topographic maps;- DTEM (Digital Terrain Elevation Model) extraction;- slope analysis;- GIS (Geographic Information System) data spatial analysis;- hazard zoning criteria definition;- hazard mapping.
- Define causes and typology of landslides- Individuate and map all the landforms indicating instability conditions or that can control slope processes- Define hazard models - Define hazard classes and mapping rules
TASKS
- Geomorphological and Landslide Hazard Maps (scale 1:25.000)- GIS open database setting-up
PRODUCTS
APPLICATIONS
- Civil protection- Land-use planning- Landslide Hazard geotechnical assessment- Landslide Risk Assessment
Santa Tecla2.12.00
Santa Tecla16.01.01
LANDSLIDEANALYSIS
ante (remote) and post (field) landslide events
HAZARDMODELS AND
CLASSES
LANDSLIDECAUSES
REMOTE SENSING(1996 – 1:20.000)
Geomorphological map
DTEM PROCESSING(1980 – 1:25.000 – eq. 10 m)
Slope map
GIS ANALYSIS
HAZARDMAP
DATA
HAZARDGIS DataBase
Hazard class Description
a landslide bodies, alluvial and debris fan
I Very high b areas subtended by landslides and fluvial (b’) scarps
c talus slopes
d highly steep slope areas (>55°)
a areas on the border rim of cliffs and landslide scarps
II High b areas underlying landslide bodies, highly steep slopes, talus slopes, alluvial or debris fans
c steep slope areas (25°÷55°)
III Medium Slightly steep slopes (5°÷25°)
IV Low or Null Planar or sub-planar surfaces (<5°)