ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

Traditionally to identify periglacial hazards in the field detailed
geomorphological mapping would be undertaken.
However, walk-over surveys may not always identify all such
features since natural degradation such as hill wash and
intense agriculture and ploughing may have removed surface
traces which will impede their identification. Additional
data sources such as aerial photographs can be used together
with borehole surveys but a more robust and comprehensive
interpretation and investigation is needed to reduce
the risk of encountering these features.
Moisture sensitive wavelengths of remotely sensed imagery
are being used to explore the fundamental relationship
between the surface vegetation, underlying bedrock
geology and ground that has been disturbed or undergone
some form of mass movement in order to delineate potentially
hazardous ground. The piezometric data from
the borehole ground investigation provides a detailed indication
of the groundwater conditions at the time of capture
of the remotely sensed imagery. This project is utilising
Geographical Information Systems to integrate, manipulate,
analyse and display these major data sets in order
to identify these geohazardous features. Primarily
moisture sensitive bands of remotely sensed imagery including
Landsat Tm, Spot Xs and Airborne Thematic
Mapper data are being integrated with 'ground-truth'
geomorphological mapping and ground moisture sensitivity
surveys to delineate and interpret areas of potential
hazard. Known periglacial features and landslide areas are
being spectrally defined in order to provide a predictive
tool for other areas of similar geology and slope conditions.
This project will provide a geohazard delineation methodology
which can be utilised for the investigation of periglacial
features which are critical in engineering geological
and geomorphological investigations. The research is developing
methods for the use of remotely sensed imagery and
Geographical Information Systems as part of an integrated
hazard assessment of periglacial solifluction and landslide
hazards.
SERGIO GINESU
The periglacial deposit of the Middle Pleistocene
in Sardinia
Istituto di Scienze Geologico Mineralogiche, Universita,
c.so Angioy 10, 07100 Sassari, Italy
The main geomorphological characteristics of Mt. Tuttavista
near Orosei, long the coast of eastern Sardinia, have
bein investigated on the basin of new paleontological dating
in a lot of fossiliferous karsts.
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This region is partially occupied by pliocenic lava flows
consolidated from 3.9 M.Y.B.P. to 2.1 M.Y.B.P., the periodical
volcanic activities offer more possibilities to recostruction
the landscape evolution during Pliocene.
The most important observations are connected to the
comparision by periglacial deposits and landforms with each
fossiliferous karst; the ages of the karst are different
(from Middle-Lower Pleistocene to Upper Pleistocene­
Holocene) thanks to the determination of new faunistic
species still under observation.
For the first time in Sardinia it is possible to attribute an
age to the periglacial deposits as eboulisordonnes or stratified
slope deposits in two different episodes: the first located
before the ancient fossiliferous karst known in the M.
Tuttavista (before 0.7 M.Y.B.P.), a second during the climatic
change that produced the probably exitinction of some
species in the island.
The landscape recostruction and evolution until the Pliocene
let us to identifie the possible climatic change and the
different quantity of material produced during the cold
stages.
SERGIO GINESU ', ANDRE OZER 2 , VALERIA PANIZZA 3,
MARIA ANTONIA PULINA 4 & STEFANIA SIAS 1
Recent evolution of the Coghinas coastal plain
(Anglona, North Sardinia, Italy)
1 Istituto di Scienze Geologico Mineralogiche,
Universita di Sassari, c.so Angjoi, 07100 Sassari, Italy
2 Laboratoire de Geomorphologie, Universite de Liege, Liege, Belgium
3 Istituto e Laboratorio di Geografia,
Universita di Sassari, p.zza Conte di Moriana, 07100 Sassari, Italy
4 Dipartimento di Ingegneria del Territorio,
Universita di Sassari, v. De Nicola, 07100 Sassari, Italy
The coastal plain of the Coghinas river represents one of
the best examples of alluvional evolution of a fluvial valley
influenced by tectonics. Previous 'studies have given a solid
base for the realization of a geomorphological map representing
the evolutional processes and forms that influenced
the formation of the valley during the Quaternary.
The territory of the Coghinas low plain preserves all forms
that determined the evolutional processes of the west-central
Sardinia, with particular reference to the following
morphologies and processes: big landslide movements,
morphostructures, paleosurfaces, fluvial terraces, coastline
variations and fluvial course variations.
The origin of the valley may be brought back to a big tectonic
structure of regional importance, which caused the
abandonment of the ancient course at the end of the Tertiary.
The new course, thus set up, allowed the opening of
the actual plain with an evolutional pattern mainly linked