1,721,101 research outputs found
Spatial distribution patterns of dated landslide events in the Northern Apennines in response to Holocene regional climatic changes
No full textIn this work we examine the spatial and temporal distribution of radiocarbon dates from landslides on the NEfacing side of the Northern Apennines during the Holocene, focusing on the region’s associated vegetation and
climatic changes. We also propose a method for identifying areas and landslides that may contain very old
organic materials for future research in the region. This analysis was based on a principal component analysis
(PCA) on 5255 grid cells measuring 1 km2 each, overlaid on the study area. These grid cells incorporated variables derived from the terrain characteristics, including underlying lithologies and topographic features.
Our findings reveal that, during the upper Holocene, the last dated events of recurrent and single-event
landslides occurred first closer to the coldest and wettest territories once occupied by the glacier termina during the Last Glacial Maximum (LGMgt). Subsequently the last dated events occurred at distances greater than 30
km from the LGMgt, towards the mountain chain’s margin. Conversely, at the beginning of the Holocene, an
opposite pattern emerged, with landslide events occurring towards the chain interior. These spatial patterns were
consistently observed when considering also the entire dataset of 87 dates for landslide events. During the middle
Holocene, we observed that the recurrent landslides were primarily concentrated within a narrow belt 8.5 km
from the LGMgt. Furthermore, higher rates of landslide activity were associated with the 4.2 ka BP event and
persisted until approximately 2.0 ka BP, indicating a correlation with wet and cool periods. In conclusion, these
spatial patterns in landslide events can be linked to changes in precipitation patterns and dominant atmospheric
circulation in the mountain belt occurred since the beginning of the Holocene
Active Landslide Portions Contribute to Surface Water Concentration: Insights from GIS Analysis and Field Data in the Northern Apennines
No full textThe distribution of small water bodies associated to landslides in a part of the Northern Apennines (Italy) has been explored, for the first time, using GIS analysis, field surveys and geophysical imaging. The analysis on the whole investigated area was performed using the Topographic Wetness Index (TWI), a proxy for surface soil moisture patterns based on topographic characteristics. The case studies correspond to two large landslides deep-rooted in the bedrock. The Sauna landslide in the Parma torrent basin and the Berceto landslide in the Taro river basin, have been investigated through field work, geophysics, boreholes and radiocarbon dating for the time constraints of the water bodies. The TWI analysis carried out both at the regional and the case-study scale has shown that low values of this index (drier areas) are more associated with inactive landslides portions, whereas higher values (wetter areas) are more associated with active portions. The analyses on the case studies highlighted that the condition characterized by wet soil and/or the presence of small water bodies are spatially persistent across time in correspondence of the same portion of the landslide that preserves landforms able to maintain these waters. As highlighted by geophysics, these landforms are in connection with deep shapes of the sliding/rupture surface of the landslide that mimic those at the surface
Training on the topic of landslides and slope stability in Rwanda: a Summer School in the framework of the Erasmus plus EnRHEd project
No full textFrom the 11th to the 16th of July 2022, a Summer School on "Landslides and Slope Stability Analysis in Rwanda" took place at Rwanda Polytechnic - College of Musanze (Rwanda). The Summer School was organized by the hosting institution (Rwanda Polytechnic - College of Musanze) in cooperation with the University of Parma (Italy), Rwanda Water Resources Board (RWB), and Rwanda Transport Development Agency (RTDA) in the framework of the Erasmus + EnRHEd project (). The EnRHEd project ("Enhancement of Rwandan Higher Education in strategic fields for sustainable growth") is co-funded by the European Commission and is coordinated by the University of Parma. Among the strategic fields for sustainable development, this project deals with "Environmental protection, safety, and management." In this domain, the topic of landslides plays a fundamental role, especially referring to the Rwandan context. It was the first time such a kind of Summer School on slope stability analysis took place in Rwanda. Besides the organizing institutions, the Summer School was supported by many other sponsors, like ICL - International Consortium on Landslides, AIGeo - Italian Association of Physical Geography and Geomorphology, IAH Italian Chapter - International Association of Hydrogeologists, Rocscience Inc., and the University of Parma
Geomorphological and archaeological evidence of Roman times shoreline in the La Spezia Gulf,
No full textTwo sites in the western promontory of La Spezia Gulf are illustrated in which the identification of a shoreline slightly lower than presentday is possible. They are the archaeological site of Varignano Cove, a rural settlement of Roman Times where drainage channels in connection with a dock were identified and a cave in Palmaria Island (Riparo del Pozzale), in which a beach deposit was found in a pit 60 cm below present-day sea level. For both sites chronological attribution is discussed but we particularly focus, for each type of marker, on the sea-level indication and on the error associated to it. Available data point to a position of the 2,100 B.P. shoreline not higher than 41.5 cm below present-day sea level. This is consistent with a moderate uplift rate, testifying the general tectonic stability of the area in the upper pan of the Holocene. The most recent tectonic behaviour of the area is comparable with what is known to be the crustal displacement trend in rhe area in the past 125,000 years
Geomorfologia del territorio dell’antica Luni per la ricostruzione del paesaggio costiero in età romana
No full textGeomorphological features of the ancient city of
Luni (La Spezia) territory: a tool for reconstructing the area
coastal landscape in Roman times.
The port of the Roman colony of Luni, from which the marbles quarried in the Apuan Alps, used to build most of the monuments in Rome, were
delivered, was never precisely localized, although it is supposed to be located inside the present day coastal plain built by the Magra River since the Early Middle Ages. In this paper an original detailed geomorphological survey of the area is presented, together with the results of some laborato-
ry analyses aimed at characterizing the sedimentary bodies mapped in the field. The data obtained, related to the current reconstructions of the environmental features of the site, enabled us to constrain within relatively definite land strips the location of the coastline in Roman Times. In such areas, therefore, archeological research should be focused to identify the city harbour structures
Le piattaforme litorali dell’Isola Palmaria(Golfo della Spezia): un esempio di forme ereditate nella costa rocciosa della Liguria orientale
No full textRapporti fra livelli di carsificazione e paleo-linee di riva nelle isole del Golfo della Spezia (Liguria orientale)
No full textCave levels and palaeo shorelines in the islands of the La Spezia Gulf (Eastern Liguria). In this paper the first results are presented of a new inventory of the karst caves in the Palmaria, Tino and Tinetto islands, bordering westward the Gulf of La Spezia. These caves are modelled
in the upper Triassic-lower Jurassic limestones and dolomites belonging to the Tuscan Nappe. The two existing inventories, one worked out in the 1950s and the other one twenty years later, have been revised. A data base has been created with the results of a recent survey. Morphometric parameters of the caves (elevation, maximum and minimum width and height
and total length) and the elevation of their entrance have been
measured. Data have been organized in a specially designed worksheet (one for each cave), containing, in addition to the morphometric parameters, a description of the caves morphology and of the different kinds of deposits filling them. Each spreadsheet includes also a map and one or more sections of the cave, obtained updating the old inventories’ maps. The total number of inventoried caves is 21: some of those present in the old inventories have meanwhile been destroyed by quarrying activities and a submerged cave never described before has been added. Most of the caves are above sea level, five are partly flooded by the sea and only two are totally submerged. From a morphometric point of view they have been grouped in two families: one includes those caves that are developed mostly in horizontal and the other those that are equally developed in each dimension. Elevation data cluster suggesting the existence of four cave levels, at -5, +3,+12 and
+32 m a.s.l., that are consistent with the height at which past sea-level markers are reported for eastern Liguria; in this area, therefore, cave levels could be considered due to different Quaternary sea-levels. The new inventory of the karst caves of the Gulf of La Spezia Islands should be regarded as well as a basic tool for their exploitation from a geo-touristic point of view: they should be considered, in fact, part of the natural
heritage of the Natural Regional Park of Porto Venere
Il paesaggio geologico dell'Appennino emiliano: dalla fragilità alla valorizzazione territoriale.
No full textL'Articolo illustra brevemente le caratteristiche fisiche del territorio dell'Appennino Emiliano che determinano i suoi diversi punti di forza ma
anche di fragilità. In particolare descrive sinteticamente dal punto di vista geologico e geomorfologico le Valli del Torrente Parma e dell’alto Torrente Cedra che presentano alcuni tratti
caratteristici che sono emersi nello sviluppo delle riflessioni e nelle azioni progettate durante i laboratori che hanno caratterizzato l’Edizione 2019 del Corso Materia Paesaggi
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