ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

tation of a geomorphological map and inventory of the
main landslides); 2) study of the geological and hydrogeological
characteristics (implementation of geological ­
structural and hydrogeological maps); 3) study of the geotechnical
and geomechanical characteristics (geomechanical
characterisation of rocks and complex formations, implementation
of contour plots of structural data, analysis
of spacing and Joint Roughness Coefficient distributions
and of joint wall compressive strength, elaboration of maps
of geomechanical classification of rock slopes; 4) factor
mapping and correlations (hazard mapping and risk analysis
of the investigation area; application of the rock engineering
systems).
In the poster the main documents prepared within the framework
of the research are shown.
MARIO P ANIZZA 1, ALESSANDRO P ASUTO 2
& MAURO SOLDATI 1
Geomorphological mapping as a fundamental tool
for landslide management: the example of
Cortina d'Ampezzo (Dolomites, Italy)
1 Dipartimento di Scienze della Terra, Universita degli Studi di Modena,
largo S. Eufemia 19,41100 Modena, Italy
2 Irpi, Cnr, corso Stati Uniti 4,35127 Padova, Italy
Mapping is in most cases a necessary step in geomorphological
investigations aiming at landslide management. Maps
may consist of either basic documents such as geomorphological
maps and landslide maps or of landslide susceptibility
maps and hazard zonation maps.
After a brief review concerning the use of mapping in
landslide studies in different countries, the maps produced
as a result of geological and geomorphological investigations
carried out in the area of Cortina d'Ampezzo (Eastern
Dolomites) are presented. The study area has often
been affected by landslides of various types and sometimes
of considerable dimensions, some of which are still active
today. Because of intense urbanisation and the interest
which this region holds for tourism, the presence of some
active landslides and of a large number of dormant ones
makes this area particularly vulnerable and subject to high
geomorphological risk.
From the cartographic standpoint, the first achievement
was a geomorphological map at the 1:10,000 scale, produced
following the Italian methodology and legend. Besides
geological data, this map includes details on the general
slope morphology and related processes and, as far as
landslides are concerned, defines the type of failure, the
degree of activity and the main associated features. This
map was the basis for the elaboration of a 1:25,000 scale
map in which gravitational deposits have been grouped into
landslide units. A landslide unit has been defined as the
association of landslide accumulations strictly connected in
302
space and time: it can consist of a single main landslide
and successive reactivations or of a superimposition of accumulations
caused by repeated activations of a main
scarp; it can also be due to neoformation scarps affecting a
landslide body. A landslide unit is often marked by a detachment
zone and by a preferential accumulation area well
related from the spatial point of view; this reflects also on
the prevalent lithological characteristics found within the
unit itself. Other kinds of deposits (e.g, lacustrine or alluvial
deposits linked to river damming or depressions formed
along the slopes) may be included in a landslide unit.
Scree slopes and talus cones found at the toe of the main
landslide scarps are included in the unit, since they are genetically
linked to the gravitational phenomena considered.
Finally, the morphological features of the deposits belonging
to a landslide unit generally show a close relationship
with the main movement type.
The use of landslide units provides the reader an easier understanding
of the complex geomorphological evolution of
the area of Cortina d' Ampezzo and gives useful elements
for landslide hazard assessment and management.
MARTA PAPPALARDO
Observations on some stratified slope deposits
in the Gesso Valley (Italian Maritime Alps):
typology and significance
Dipartimento di Scienze della Terra, Universita di Pisa,
via S. Maria, 53, 56126 Pisa, Italy
Along the slopes of the medium-lower Gesso Valley (Italian
Maritime Alps) some stratified slope deposits can be
found. The reason for interest in them is not their peculiarity,
this type of deposit is well known in many other parts
of the world, but the importance their presence and their
characteristics assume in the correct interpretation of the
paleogeographical evolution of the valley. Through them
the activity of different morphoclimatic environments since
the greatest expansion of the last ice age can be focused on.
In the Gesso Valley stratified slope deposits developed on
limestones and marls outcrops belonging to the Delfinian
Units, of Mesozoic age. They are widespread between 800
and 1100 m of altitude, and occupy the basal part of rocky
slopes dipping 100% or more. The uplift movements of
the Argentera Massif, infact, caused tectonic movements in
the Delfinian Units, which were consequently back folded.
Along the flanks of the resulting folds the valleys of the
medium-lower part of the basin were dissected.
The dip of the slope deposits is roughly 40 0/0. At the bottom
alluvial terraces of first order overlap them. Their
thickness varies from a few dm to some tens of meters. In
the thinnest sections stratification does not appear evident.
At present they are inactive.