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Author Archive

041_2_09_glaciological_survey_2017

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.17

BARONI C., BONDESAN A., CARTURAN L. & CHIARLE M. (eds.),

Report of the glaciological survey of 2017

Pages 115-193

Full Text (PDF)

The complete list of the free downloadable CGI glaciological surveys, since 1928, is available HERE

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041_2_08_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.16

BOLLATI I.M., CERRATO R., CROSA LENZ B., VEZZOLA L., GIACCONE E., VIANI C., ZANONER T., AZZONI R.S., MASSEROLI A., PELLEGRINI M., SCAPOZZA C., ZERBONI A. & GUGLIELMIN M.,

Geomorphological map of the Val Viola Pass (Italy-Switzerland)

Pages 105-114

Abstract

The Val Viola Pass is a transboundary area between Italy (Val Viola Bormina) and Switzerland (Val da Camp), whose evolution has been triggered, since the Last Glacial Maximum (LGM), by intense reactivation of surface processes. Geomorphological mapping at a scale of 1:5000 provided an understanding of the deglaciation dynamics affecting this region. The geomorphological map (herein presented at scale 1:7000) extends for 5.35 km2 between the elevations of 2305 and 3302 metres above sea level (m a.s.l.). The geomorphological map suggests that the area undergoes geomorphic processes typical of alpine environments of middle latitude, and had experienced a paraglacial-type re-equilibrium related to post-LGM land evolution, with predominant slope and periglacial processes. Moreover, current water action is evident at low elevations. Most of landforms are affected by major regional structures oriented NE-SW. On the Swiss side, specific investigations of the Paradisin rock glacier were performed by Electrical Resistivity Tomography-ERT to determine its internal structure. This was in order to understand its possible cryotic conditions, despite its relict appearance derived from its surface aspect.

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041_2_07_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.15

ZAKERINEJAD R., OMRAN A., HOCHSCHILD V. & MAERKER M.,

Assessment of gully erosion in relation to lithology in the southwestern Zagros Mountains, Iran using ASTER data, GIS and stochastic modeling

Pages 81-92

Abstract

Soil erosion in arid areas is a major environmental threat. Gullies, as one of the most intensive soil erosion processes, are very common in the southwest of Iran. Lithology, vegetation density and climate change, as well as land use and land cover change are effective drivers of soil loss in general, and gully erosion in particular. The overall objective of this research is to assess the relation between, lithology and the spatial distribution of gullies in the Mazayjan basin. Data were collected by field survey, interpreting aerial photos and analyzing ASTER multispectral images. Modeling of spatial gully susceptibility was performed with a GIS-based statistical mechanics approach (Maxent). The analysis of ASTER bands ratios yields valuable results in terms of the mineral differentiation of the Zagros Mountain substrates and hence, can be utilized as a tool for lithological mapping. Additionally, the statistical mechanics approach used to assess the relation between existing gully locations and the combinations of lithologic predictor variables show that gullies have a high probability in areas showing substrates with high amounts of salt, gypsum and marl, especially in the plain areas. The model performance shows a very high accuracy both for train and test data. The spatial prediction highlights concentrated gully erosion in areas with aeolian sediments on top of alluvial substrates.

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041_2_06_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.14

Proceedings of the International Conference “GEOSUB 2016″, Ustica (Italy) 13 – 16 September, 2016
FURLANI S., ANTONIOLI A., SCICCHITANO G. & BUSETTI M. Guest Editors

 

SCICCHITANO G., SPAMPINATO C. R., ANTONIOLI F., ANZIDEI M., LO PRESTI V. & MONACO C.,

Comparing ancient quarries in stable and slowly uplifting coastal area located in eastern Sicily, Italy

Pages 81-92

Abstract

The coast of the Mediterranean still preserves several remnants of ancient coastal quarries that has been often used to provide insights on the sea-level changes occurred during the last millennia. The southeastern coast of Sicily (Italy) is characterized by the occurrence of more than fifty ancient quarries that have been detailed surveyed and studied from archaeological and geomorphological point of view. Most of these quarries are presently partial submerged and some of them for this reason have been used as marker of ancient sea level, providing important data on relative sea level change and tectonic mobility during the late Holocene. We selected six important and well known ancient quarries located in coastal sectors characterized by different tectonic rates of uplift, e.g. in a stable area (Marzamemi) and in a significant uplifted area (Augusta). The elevation of the deepest floors of the lowest level of the quarries has been measured by an invar rod with respect to present sea level, and corrected for tide at the time of surveys. These data were compared with predicted sea level rise curves for the Holocene using a glacio-hydro-isostatic model. The comparison with the curve for the southeastern Sicily coast yields a tectonic component of relative sea-level change related to regional uplift. Uplift rates ranging between ~ 0 and 0.4 mm/a have been estimated.

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041_2_05_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.13

Proceedings of the International Conference “GEOSUB 2016″, Ustica (Italy) 13 – 16 September, 2016
FURLANI S., ANTONIOLI A., SCICCHITANO G. & BUSETTI M. Guest Editors

 

MASTRONUZZI G., MILELLA M., PISCITELLI A., SIMONE O., QUARTA G., SCARANO T., CALCAGNILE L. & SPADA I.,

Landscape analysis in Torre Guaceto area (Brindisi) aimed at the reconstruction of the late Holocene sea level curve

Pages 65-79

Abstract

This paper focuses on four different cores drilled in the Area Marina Protetta e Riserva dello Stato di Torre Guaceto (Carovigno, Brindisi). The stratigraphic, sedimentological and paleontological characteristics were related to the geomorphologic features of the whole area and to the radiometric dating of the peaty levels identified in the stratigraphic sequence; the results have been compared with the available geo-archaeological data. The complete data-set allowed to reconstruct the succession of sedimentary environments over time and to place these across the last 2200 years, thanks to radiometric dating. In the stratigraphic sequence, it was possible to highlight layers that indicate coastal areas marked by the presence of inlets in connection with the sea, areas submerged during tides and brackish or continental areas. In particular, the research demonstrated, with good approximation, that the sea level had to be stationed at about -1.1 ± 0.1 m approximately 2200 years BP; then it went to about -0.65 ± 0.1 m about 1900 years BP and continued its rise to the current position. Finally, the comparison of the stratigraphic data with the geophysical predicted sea level curve for the late Holocene indicates that vertical movements in this span of time did not affect this area. This confirms what has recently been established for this area as regards the stability of the Adriatic side of the Apulian foreland.

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041_2_04_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.12

Proceedings of the International Conference “GEOSUB 2016″, Ustica (Italy) 13 – 16 September, 2016
FURLANI S., ANTONIOLI A., SCICCHITANO G. & BUSETTI M. Guest Editors

 

GIACCONE T., GIACCONE G. & MANNINO A.M.,

Deep rhodolith beds in the Ustica island (Sicily, Southern Tyrrhenian Sea): a sedimentary and paleoecological approach

Pages 47-63

Abstract

The results of a multidisciplinary study conducted on the circalittoral soft bottom assemblages at Secchitello (Sicchiteddu) and in the neighbouring areas along the southern coast of Ustica Island (Sicily, Southern Tyrrhenian Sea) are presented. In particular, the study provided useful data for a taxonomic, ecological and paleoecological revision of the Coastal Detritic facies with free-living calcareous algae and for a critical analysis of their relationship with the sedimentary dynamics. During a survey, carried out by the University of Catania (1991) with a R.O.V. (remotely operated vehicle), the presence of the Coastal Detritic (DC) biocoenosis, characterized by a surprisingly high biodiversity, and of the Platform Coralligenous (C) biocoenosis, dominated by rhodolith bio-concretions with large and branched Bryozoa was recorded. The DC of Secchitello, situated at a depth of between 50 and 90 m, was mainly characterized by: prâlines, boxwork, branches and coated grains growth forms; the dominance of the Lithothamnion minervae facies; coarse sediments belonging to the sand and gravel classes, with the last one mainly of biogenic nature. Where the hydrodynamism is reduced (at a depth of between 80 and 90 m), an ecotone community between the DC and the C biocoenoses, growing on boxworks, was found. The density and biodiversity of the free-living calcareous algae and of epiflora found at Secchitello are high, and the extension of the rhodolith beds are comparable to that of the C assemblage. The rough morphology of the bottom, increasing the current activity, together with the presence of biodisturbance phenomena mainly due to echinoderms such as Cidaris cidaris, Echinaster sepositus and “sail” epiphytes, such as Cystoseira spinosa v. compressa and Phyllophora crispa, were responsible for the increase of the rhodolith overturning. The analysis of thin sections of non-geniculate coralline red algae allowed to reconstruct the paleoenvironmental evolution of the Secchitello, pointing out three different phases of colonization: initial, intermediate and recent. The transition from one phase to another is probably due to the changes in intensity and direction of the currents in the last millennium.

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041_2_03_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.11

Proceedings of the International Conference “GEOSUB 2016″, Ustica (Italy) 13 – 16 September, 2016
FURLANI S., ANTONIOLI A., SCICCHITANO G. & BUSETTI M. Guest Editors

 

FURLANI S., PIACENTINI D., TROIANI F., BIOLCHI S., ROCCHEGGIANI M., TAMBURINI A., TIRINCANTI E., VACCHER V., ANTONIOLI F., DEVOTO S., NESCI O. & MENICHETTI M.,

Tidal notches (Tn) along the western adriatic coast as markers of coastal stability during late Holocene

Pages 33-46

Abstract

In this paper, we present and discuss the spatial distribution of Tidal notches (Tn) along the western sector of Adriatic Sea as a marker of the coastal stability during late Holocene. Specifically, a 3.97 km long coastal reach at the Mt. Conero area has been investigated in relation to its geological and geomorphological pecularieties such as: i) active, low rates uplift; ii) active coastal plunging cliff; iii) diffuse gravity-induced instability of the rocky cliff and consequent presence of coastal landslides of different type, size and state of activity. The identification and location of Tn has been conducted on July 2016 by means of a snorkel survey along a route encompassing the toe of the Conero coastal cliff, allowing the investigation of the tidal zone and recognition of the morphotypes above and below the sea level. Time-lapse images with frame rate of 1 s were collected along the entire route. The best quality frames were used to precisely clusterize the coastal geomorphological features, and to precisely locate the recognized Tn. The snorkel survey was supported by detailed geomorphological surveys and geo-structural investigations from inland. This multifaceted approach allowed to identify and precisely locates Tn, other than to establish relationships among their morphometric features and other specific coastal morphotypes recognized in the field. Tns have been observed for the first time in the study area. Although the rocky coastal cliff is affected by active uplift and several active landslides of different types, sizes and depth, the Tn location and elevation suggests that i) late Holocene vertical deformations due to tectonic are negligible for the whole coastal sector analysed; ii) gravitaty-induced vertical deformations involving bedrock are negligible during at least the last couple of centuries in the coastal stretches where they are preserved.

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041_2_02_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.10

Proceedings of the International Conference “GEOSUB 2016″, Ustica (Italy) 13 – 16 September, 2016
FURLANI S., ANTONIOLI A., SCICCHITANO G. & BUSETTI M. Guest Editors

 

DISTEFANO S., GAMBERI F., BALDASSINI N. & DI STEFANO A.,

Late Miocene to Quaternary structural evolution of the Lampedusa Island offshore

Pages 17-31

Abstract

The Pelagian Archipelago (Lampedusa, Lampione and Linosa islands) rests within a complex geodynamic context characterized by the simultaneous interaction of two apparently in contrast tectonic processes: the convergence along the Apennine-Maghrebian accretionary wedge and the late Miocene-early Pliocene rifting in the Sicily Channel. Through recently acquired, high-resolution single-channel seismic reflection profiles (Sparker System), an updated interpretation of the structural setting of Lampedusa Island offshore and its significance in the regional tectonic scenario has been performed. Late Miocene-early Pliocene rift structures control the tectonic evolution of the Lampedusa plateau, with the development of graben and half-graben basins, filled with syn-rift deposits, in most of the offshore area. In particular, two systems of normal faults in the Lampedusa offshore have been recognized. The master extensional faults, oriented WNW-ESE, represent the main structural alignment of the Lampedusa offshore, reflecting the extensional trend of the Sicily Channel. The second order extensional faults, orientated NNW-SSE, bound smaller pull-apart basins probably associated with the main dextral-transtensive regional regime. The observed tectonic fabric of the Lampedusa plateau is in agreement with the geodynamic features of the area, consisting of a regional extensional regime in a dextral-transtensive zone, marked by extensional and pull-apart basins. More in particular, a different distribution of the syn-rift wedges in the various sectors of the Lampedusa plateau has been identified. It shows that extensional faults terminated their activity in late Miocene in the southern sector, whereas they were active until at least the early Pliocene in the northern one. Furthermore, the tectono-stratigraphic analysis here presented has allowed the identification of the offshore continuations of structures cropping out on land, such as the Cala Creta and the Punta Muro Vecchio normal faults.

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041_2_01_2018

giugno 14th, 2019

DOI 10.4461/GFDQ.2018.41.9

Proceedings of the International Conference “GEOSUB 2016″, Ustica (Italy) 13 – 16 September, 2016
FURLANI S., ANTONIOLI A., SCICCHITANO G. & BUSETTI M. Guest Editors

 

ANZIDEI M., SCICCHITANO G., TARASCIO S., DE GUIDI G., MONACO C., BARRECA G., MAZZA G., SERPELLONI E. & VECCHIO A.,

Coastal retreat and marine flooding scenario for 2100: a case study along the coast of Maddalena Peninsula (southeastern Sicily)

Pages 5-16

Abstract

The coastal area of southeastern Sicily (Italy) is undergoing weak land subsidence, heavy coastal retreat, land flooding and exposed to severe storms associated with high-waves, also in consequence of the global sea level rise, which is expected to raise even more that 1 m by 2100 AD depending on different estimates. This value will be even larger in subsiding coasts, entailing widespread environmental changes, coastal retreat, marine flooding and loss of land, which will be subtracted to human activities. To understand the impact of rising sea level on the coast of Maddalena Peninsula, near the town of Siracusa, we realized a very high resolution Digital Terrain Model (DTM) through aerial photogrammetric surveys, obtained by Unmanned Aerial Vehicles (UAV) on which we projected the expected coastline for 2100 AD. Here we show a detailed marine flooding scenario for 2100, as generated from: i) high resolution DTM, ii) rate of land subsidence from GPS data and iii) predicted sea level projections from the IPCC AR5 reports (RCP2.6 and RCP8.5). Our analysis estimates a maximum relative sea level rise at 0.20 m and 0.65 m for 2050 AD and 2100 AD, respectively for AR 8.5 scenario. The increased sea levels will cause relevant morphological changes to the investigated coast with a maximum beach retreat of 27 m and a loss of land of 7400 m2, affecting building integrity and people safety.

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041_1_08_2018

dicembre 7th, 2018

DOI 10.4461/GFDQ.2018.41.8

VALENZANO E., SCARDINO G., CIPRIANO G., FAGO P., CAPOLONGO D., DE GIOSA F., LISCO S., MELE D., MORETTI M. & MASTRONUZZI G.,

Holocene morpho-sedimentary evolution of the Mar Piccolo basin (Taranto, southern Italy)

Pages 119-135

Abstract

The Mar Piccolo basin (Gulf of Taranto, northern Ionian Sea) is well-known in literature for the detailed records of Late Pleistocene sea-level changes. The Holocene deposits, however, have never been analysed in detail. In this paper, new geophysical datasets and the data from two wells have been used to investigate the morpho-sedimentary Holo¬cene evolution of this basin. In addition, dating of peat samples and the occurrence of a tephra (“Pomici di Mercato” event – ca 8900 BP) provide the timing of the different evolution stages. Morphological features of the basal unconformity, sedimentological data from core analysis, and the areal distribution of lithofacies have allowed the identification/recognition of an incised-valley system occurrence which had formed during the last sea-level cycle. Furthermore, a polyphasic basal erosional surface, formed during fluvial incision and successive ravinement processes, has been identified. The sedimentary infill records fluvial to transitional environment units of a low energy semi-enclosed basin.

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