1,721,004 research outputs found
LASER SCANNER SURVEY TO REBUILD LARGE BOULDER ACCUMULATED BY EXTREME EVENT IN TORRE SQUILLACE (SOUTHERN APULIA - ITALY)
No full textSome results of coastal defences monitoring by ground laser scanning technology
No full textA general coastal retreat affects almost all the beaches of the Apulia region (southern Italy). In particular, the coastal strip of the Gulf of Manfredonia shows an evident retreat due to human activity. To control coastal erosion, several defence interventions have been realised: breakwaters, shore parallel defences, and, above all, sev- eral types of groynes (rectilinear, hook-shaped, T-shaped) were built along the shoreline in accordance with local request. Nowadays, there are about 300 coastal defences built up to protect against human activities. A laser scanner survey of these defences, using a Leica Geosystems HDS3000, was carried out between April 2006 and September 2008 to collect data about the beach profiles and changes occurring in the defence framework. The survey work consists of 3D rendering of defences in order to make comparisons between scans of different periods. Overlap between the points cloud of the whole coastline showed that defences preserved their own profile when no human interventions took place. Moreover, throughout the length of the investigated area, not a single trend occurred in the beach profile: according to the defence framework, some stretches of coast display advancing trend, while others are stable or retreating. Therefore, this preliminary study indicated that the changes that occurred in the beach pro- files and defence structures are mainly due to human interventions
Erosion hazard assessment along the Capitolo coast (Monopoli, southern Italy)
No full textErosion affects about 25% of the coast of the Apulia region, with the severest consequences
being along sandy coastlines. Beach retreat is mainly due to the decrease of solid material
transport, the destruction of dune deposits and the building of docks that obstruct the
longshore current. A survey was conducted around Capitolo, the main sandy coastline near
Bari, to examine the hazards affecting beaches and to provide guidelines for the
management of human activities along the coasts. The survey was carried out along a
coastal stretch of about 3 km, extending in a South Easterly direction from 178 21′ 30′′ E,
408 54′ 20′′ N to 178 23′ E, 408 53′ 40′′ N. The map, at a scale of 1:3000, shows three
levels of hazard, determined as follows: (i) the state of preservation of the dunes and
watercourses, based on the geomorphological map of the Apulia region; (ii) data collected
from July 1989 to April 2008 by the Monopoli buoy of the National Wave Measuring
Network; (iii) the shoreline change rates computed within a geographic information system
(GIS). A matrix was established taking into account of these features, weighting each
parameter in order to develop a hazard-level measurement for shoreline lengths of about 25
meters. The results show that all Capitolo beaches have a high level of shore preservation
hazard. The results of this study should be a factor in any decisions made on the
management of the present day village, both existing commercial activities and the future
development of the area
Problematiche connesse con la progressiva impermeabilizzazione dei terreni dell'area industriale di Bari
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Characterization and enhancement of the Vignanotica Bay Sea-Cliff (Gargano, Puglia, Southern Italy)
No full textIntegrated Geological and Digital Surveys to Know, Preserve and Promote a Geoheritage: the Sea Cliff of Vignanotica Bay (Gargano Promontory, Southern Italy)
No full textThe sea cliff of Vignanotica Bay (Gargano Promontory, Southern Italy) is a site that, for its peculiar geological features, can be considered a witness of geodiversity and that, as such, should be evaluated as geosite. Since it is necessary to first know, then enhance, and finally protect a geosite, here we propose a modern method of study aimed at the understanding and dissemination of geological knowledge to a wide audience of non-experts. The cliff, located in the Gargano National Park, was investigated using both stratigraphic-sedimentological and digital methods. The former method, realised using macrofacies and microfacies analysis, allowed us to study features of a deep-marine environment, characterised by subaqueous slides (slumpings). The latter method allowed us to achieve a virtual 3D model of the entire sea cliff, highlighting many geological features, often difficult to observe since they are exposed along high vertical walls. The combined use of these methods led to a complete characterisation of the cliff, useful both to promote geological knowledge and to preserve the site
Gli effetti delle modifiche alle difese costiere rilevate con la tecnologia laser scanner terrestre
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