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Investigation and monitoring of slope instabilities in a rupestrian-heritage area (Basilicata, south Italy).
No full textIn this paper are reported the geological and geomorphologic studies and the main results of the monitoring survey carried out on near the city of Matera in Basilicata region (southern It-aly). The “Sassi di Matera” are, since 1993, UNESCO World Heritage. In particular this work has been done in an area, the “Parco Archeologico Storico Naturale delle Chiese Rupestri del Materano", where fine rupestrian heritages are present. In this area, the considerable acclivity of the slopes and the lithological defects and intense fracturing state of carbonate rocks cause mass movements of the blocks in terms of rock falls, topples and rockslides. The potentially unstable carbonate blocks have been defined by geological and geomorphologic surveys with particular attention to the influence of the state of fractures of the blocks. Some specific sur-veys have been carry out and the data have been analyzed following the method of Mathe-son, (1983, 1989) to obtain information about the principal directions of fracture sets and to define an index of relative risk. Detailed analyses have been carried out in the test sites showed in figure 1 and the potentially unstable carbonate blocks that need survey have been defined. On the basis of these results a landslide monitoring activities it’s started and it’s still going on. The survey is made up by traditional survey system and new technologies: a tradi-tional topographic survey, GPS measures and a deformation measurement system. The adoption of a "mixed" approach, with the contemporary use of classical techniques and GPS and ground deformation measurement could allow the capability of combination/validation behind the data coming from each measurement system and could gives a more reliable in-formation about eventual mass movements of blocks
Instabilità dei versanti e controllo, mediante tecniche integrate di monitoraggio, delle frane presenti in due siti sacri del Parco Archeologico Storico Naturale delle Chiese Rupestri di Matera
No full textLandslide monitoring with integrated techniques
No full textIn the last years, the GPS technique has become a very useful tool for the monitoring
of landslide movements. The success of this application is, of course, due to the
characteristics of GPS techniques that combine a relative easiness in the acquisition
of data with very high precision and accuracy in the measurement. Moreover, the GPS
allows an easy reconstruction of the velocity field of a landslide which adds a really
helpful information for the modelling of this kind of phenomena. The surface velocity
obtained by GPS, however, could be not really representative of the deep movements
of gravitational phenomena. This means that in the monitoring of landslides it’s not
possible to leave out of consideration the information coming from other techniques
of investigation.
In the paper are summarised the geological and geomorphological studies and the
main results of the monitoring survey carried out on some areas located in Basilicata
region (southern Italy). The landslide monitoring system is made up by traditional
survey system and new technologies.
One test site was at Lauria locality, an urbanized area interested by large and active
landslides; the lasts are subject to frequent reactivations causing severe damage to the
urban structures. The results of GPS survey, in good agreement with the results of
the geomorphologic study, show that some of the analysed landslides are subject to a
slow, continue deformations.
Other results come from the survey (in progress) about slope instability processes
observed in two different areas of the "Parco Archeologico Storico Naturale delle
Chiese Rupestri del Materano" where fine rupestrian heritages are present. In these
areas, the considerable acclivity of the slopes and the lithological defects and intense
fracturing state of carbonate rocks cause rapid mass movements of the blocks (rock
falls, topples and rockslides). On the basis of geological and geomorphological
studies, the potentially unstable carbonate blocks that need survey have been defined.
The design of the survey system is made up by a traditional topographic survey, GPS
measures and a deformation measurement system
Investigation of landslide movements in an area of historical and archaeological interest
No full textIntegrated GPS and topographic surveys of landslide area near Picerno (Basilicata Region, Southern Italy).
No full textIn order to evaluate the morphological evolution of a the landslide area near Picerno
(South Italy), in November 2006 a twenty markers network has been established. In
each point of measure a marker allowing a forced centring mount for GPS antenna and
reflecting prism for topographic measure was installed. All the measures are referred
to a marker located in a stable area. The stability of the position of the reference point
has been verified at each campaign of measurement computing his coordinates as a
point of a wider GPS network based also on stations belonging to the Italian National
GPS Network of the Italian Space Agency (ASI). In order to reconstruct the velocity
field of the investigated area, starting from December 2006 GPS and topographic
measures surveys have been carried out periodically, on a monthly basis interval. Each
GPS session of measure is at least 3 hours long, while the topographic measures, obtained
by means of full automatic station, are obtained, at each point, as the average
of a sequence of measures. Moreover, some areas of the landslide has been analyzed
by means of multi-temporal DTM reconstructed by GPS Kinematics data
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