1,777 research outputs found
Aspetti dell’ipogeismo nell’Alta Valle del Tirso
No full textSi presentano i primi risultati di· un'indagine sull'ipogeismo nell'Alta
Valle del Tirso. La regione esaminata è il Goceano, che ha restituito 61 domus
de janas, tra le quali figurano quelle della necropoli di Sos Furrighesos
(Anela), che per le manifestazioni di arte schematica in essa contenute costituisce
uno dei siti più importanti della Sardegna. Le domus de janas del
Goceano sono caratterizzate da tipologia a sviluppo longitudinale, con apliamenti
a L e a T, talvolta con ingressi a corridoio o padiglione. In alcuni casi
sono arricchite dalla presenza di elementi architettonici e di intonaco rosso
alle pareti. In base ai materiali rinvenuti sono attestate le fasi culturali Ozieri,
Filigosa, Abealzu, Monte Cl aro e Bonnanaro. Alcuni ritrovamenti suggeriscono
un riutilizzo in età storica. Sul piano dell'indagine territoriale si è
riscontrata una predilezione per l'ubicazione su fianco collinare, a quote
comprese tra 300 e 600 m s.l.m.; la maggior parte delle domus è scavata nella
trachite, in misura minore nel granito e nel tufo. In relazione alla rete idrografica
si è riscontrata una maggiore frequenza di siti a una distanza compresa
tra O e 200 m dai corsi d'acqua principale e secondario, tra 600 e 900 e oltre i
1000 m dalle sorgenti.We are presenting the first results of a research on hypogeism in the
Upper Vale of Tirso. The region which has been studies is Goceano, which
has revealed 61 "domus de janas", among which those of the necropolis of
Sos Furrighesos, which for then manifestation of schematic art consti tute one
of the most important sites in Sardinia. The Goceano "domus de janas" are
caracterized by a typology with a longitudinal development with L and T
enlargement, sometimes with corridor or pavilion entrances. In some cases
they are enriched by the presence of architectural elements and red plaster on
the walls. On the basis of the materials which have been found the cultural
phases Ozieri, Filigosa, Abealzu, Monte Claro and Bonnanaro have been
attested. Some findings suggest reutilization in the historic age. As concerns
the territorial research we ave noticed a preference for hill-side location at an
altitude between 300 and 600 m above sea level; most "domus" are excavated
in trachyte and to a smaller extent in granite and tufa. With reference to the
catchment - basin we have found a larger frequence of locations at a distance
between O and 200 m from main and secondary waterways, between 600 and
900 and above 1000 m from springs
Telerilevamento e fotointerpretazione per la cartografia della copertura del suolo
No full textIn questo capitolo si intende pro p o r re un perc o rso
di analisi delle metodologie di mappatura
della copertura del suolo, offrendo alcuni spunti
di utilizzo di diversi dati e sottolineando l’importanza
di tener sempre presente le finalità del progetto
in cui si inserisce l’analisi. In particolare
viene riportata la descrizione della metodologia di
fo t o i n t e r p retazione CORINE Land Cover e le sue
applicazioni in campo europeo con l’esperienza
m a t u rata anche in Italia. Saranno inoltre pre s e ntate
due proposte di applicazione della legenda
CORINE Land Cover in ambienti aridi e semiaridi
nel Marocco centrale e in un settore della
Tunisia meridionale. Si propongono inoltre i
risultati di uno studio per la classificazione di
immagini ad alta risoluzione IKONOS per il riconoscimento
della copertura del suolo, nell’ambito
di una ricerca sui metodi di Landscape Ecology in un settore della Sardegna settentrionale
I dati multisensore e multirisoluzione nello studio degli ambienti aridi
No full textI deserti sono i luoghi dove le condizioni estreme di aridità limitano fortemente o totalmente lo sviluppo di una copertura vegetale. Così le successioni
stra t i g rafiche delle formazioni geologiche e
la evidente natura delle forme appaiono nelle
immagini telerilevate come caratteri distintivi del
p a e s a g g i o .
At t ra v e rso l’applicazione di metodologie di
Telerilevamento, l’elaborazione di modelli tridimensionali
del terreno e rilevamenti in sito, si
p ropongono alcune applicazioni mirate alla individuazione
di unità geomorfologiche secondo
legende mira t e. Viene inoltre presentata una
importante estensione del concetto di bene geologico
e geomorfologico ampiamente discusso in
ambito nazionale ed internazionale riguardo ai
temi del geoturismo, proponendo una lettura dei
“geositi da satellite”.
Tale approccio metodologico consente l’analisi a
media e piccola scala, in un contesto di studio
regionale e sub-re g i o n a l e, di vaste porzioni di territorio,
fornendo valutazioni circa le dinamiche
ed i processi che regolano l’evoluzione dei gra n d i sistemi fisiografici
Phyllodrepa melis Hansen 1940
No full textPhyllodrepa melis HANSEN 1940 Phyllodrepa melis HANSEN 1940 Phyllodrepa linderi SCHEERPELTZ 1966 nov.syn. Lectotype (male) (here designated) labelled / Freiburg 1934 / ex coll. Scheerpeltz (blue) / Typus Phyllodrepa Linderi O. Scheerpeltz (red) / vidit A. Zanetti 1985 / Lectotype Phyllodrepa linderi Scheerp. des. A. Zanetti 2008 / Phyllodrepa melis Hansen det. Zanetti 2008; paralectotype with the same data (NHMW). C o m m e n t s: Phyllodrepa linderi was described as closely related to P. melis, a North and Central European species inhabiting the burrows of badger (Meles meles). In a previous work (ZANETTI 1987) I considered the synonymy of these taxa most likely. I have re-examined the type series and designated the lectotype, whose aedeagus is deformed by the dryness, as often happens in the Omaliinae (Fig. 12), but has the general shape that corresponds to that of P. melis (Fig. 11). Also the external characters fall in the variability range of P. melis.Published as part of Zanetti, A., 2008, Synonymies in the European Omaliinae, with notes on distribution (Coleoptera: Staphylinidae), pp. 979-992 in Linzer biologische Beiträge 40 (1) on page 982, DOI: 10.5281/zenodo.542997
Morphological and compositional investigation of Krieger crater (Moon)
No full textKrieger crater is an impact lunar crater located in the Oceanus Procellarum, on the western near-side of the Moon. It is partly overlaid by Van Biesbroeck impact crater on the southern rim; a sinuous rille, Rima Krieger, originates from the western rim. Krieger is surrounded by wrinkle ridges, linear structural features, and different mare materials. In order to investigate the geomorphological setting, we used remote sensing datasets from Lunar Reconnaissance Orbiter and Kaguya for photogeological and topographic analysis through high-resolution imagery and DEM, and Moon Mineralogy Mapper hyperspectral data for surface compositional investigation. Krieger is characterized by a polygonal-shaped rim, an asymmetrical ejecta blanket, oriented north-south (indicating a potential oblique impact) and a complex floor configuration, with morphologic features, like hummocks, large mounds, a possible central peak, and unclear concentric fractures. Both Krieger and Van Biesbroeck walls exhibit melt coating features, fresh exposed materials, melt veneers, and mass wasting morphologies. Hyperspectral analysis determined several surface mineral compositions, differing especially in olivine and glass content. Important compositional differences were observed in the Krieger floor, where mare-like basalts have been detected, suggesting an internal post-impact volcanism which resulted in the breaching of the western rim and subsequent lava flow outside the crater, originating Rima Krieger. We found also the contamination of highland material in the southern ejecta, potentially derived from the Aristarchus crater impact. Thus, this complex geological setting suggests that post-impact modification processes, including volcanism, tectonic movements and later impacts, played a key role in shaping up the present Krieger crater
Il Corno d’Africa nelle fonti turco-ottomane
No full textAfrica Orientale Italiana (AOI) era il termine adottato per indicare le colonie dell'Abissinia, dell'Eritrea e della Somalia italiana dopo la conquista avvenuta con la guerra d'Etiopia, ed ufficialmente nacque nel maggio del 1936. Questo volume, a settanta anni da quella data, prova a ricostruirne alcune vicende, dalla posizione delle donne nel duro contesto coloniale, alla presenza della radio in AOI; dall'impero italiano nei discorsi di Mussolini alla reazione dell'Africa occidentale all'invasione italiana; dal British Somaliland alla defascistizzazione della colonia Eritrea
Mapping landslides in lunar impact craters using Chebyshev polynomials and DEM's
No full textGeological slope failure processes have been observed on the Moon surface for decades, nevertheless a detailed and exhaustive lunar landslide inventory has not been produced yet. For a preliminary survey, WAC images and DEM maps from LROC at 100 m/pixels have been exploited in combination with the criteria applied by Brunetti et al. (2015) to detect the landslides. These criteria are based on the visual analysis of optical images to recognize mass wasting features. In the literature, Chebyshev polynomials have been applied to interpolate crater cross-sections in order to obtain a parametric characterization useful for classification into different morphological shapes. Here a new implementation of Chebyshev polynomial approximation is proposed, taking into account some statistical testing of the results obtained during Least-squares estimation. The presence of landslides in lunar craters is then investigated by analyzing the absolute values off odd coefficients of estimated Chebyshev polynomials. A case study on the Cassini A crater has demonstrated the key-points of the proposed methodology and outlined the required future development to carry out
La tradizione neolitica. Trasformazioni tecnologiche, economiche e sociali tra il IV e il III millennio a.C.
No full textAssessment of present day geomorphological dynamics to decipher landscape evolution around the Paleolithic sites of Melka Kunture, Ethiopia.
No full textAssessment of present day geomorphological dynamics to decipher
landscape evolution around the Paleolithic sites of Melka Kunture,
Ethiopia
Michael Maerker (1,2), Calogero Schillaci (1), Rita Melis (3), and Margherita Mussi (4)
(1) Heidelberg Academy of Sciences and Humanities, Germany ([email protected]), (2)
Department of Earth Sciences, Università degli studi di Firenze, Italy, (3) Department of Earth Sciences, Università degli studi
di Cagliari. Italy, (4) Dipartimento Scienze dell’Antichità. Università di Roma la Sapienza, Italy
The area of Melka Kunture (central Ethiopia) is one of the most important clusters of Paleolithic sites in Eastern
Africa. The archaeological record spans from c. 1.7 Ma onwards, with a number of stratified occurrences of
Oldowan, Acheulean, Middle Stone Age and Late Stone Age industries, together with faunal remains and human
fossils. However, the archaeological sites are endangered by flooding and soil erosion. The main excavation area
lies close to the convergence of the Awash river with the Atabella river, one of the main tributaries of the upper
Awash catchment. In the semi-arid Ethiopian highlands, gully networks develop especially in the vicinity of the
active and inactive river meanders. Various erosion processes are linked to specific driving factors such as the
rainfall regime, the land use/cover changes and vertic soils with a specific hydrological behaviour. It was documented
in the field and by previous research that the origin of most of the man made erosion channels is due to
animal pathways and car tracks. However, paleolandscape features increase the general erosion risk. Former wetland
areas and deposition zones are particularly affected by soil erosion processes. Hence, the spatial distribution
and characteristics of present day geomorphic processes also reveal information on the paleolandscape. In order to
assess landscape evolution and present day geomorphologic dynamics, we mapped the geomorphology describing
in detail the present-day slope processes at a 10.000 scale. We performed a detailed terrain analysis based on high
resolution DEMs such as SRTM-X with 25m resolution and ALOS/PRISM with 10m resolution to characterize
the main erosion processes and surface runoff dynamics. The latter ones are simulated using a Soil Conservation
Service Curve Number method. Landuse was delineated for a larger area using ASTER 25m multispectral data.
Finally, using calibrated topographic indices and a simple hydrological model we were able to detect and quantify
the major present day soil erosion and surface runoff processes. Based on the analysis of the processes and the
respective terrain features derived from the digital elevation models we also identified the major paelolandscape
features. This will be the basis for assessing conservation risks related to modern land use and climate
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