A. Lozej - Academia.edu (original) (raw)

Papers by A. Lozej

Research paper thumbnail of Imaging sismico dei bacini quaternari orobici

... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quate... more ... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quaternari orobici Roberto de Franco1*, Fabrizio Berra2, Giancarlo ...

Research paper thumbnail of The Northern Angolan Margin Imaged by Wide Angle Seismic Data

Petroleum Systems of Deep-Water Basins: Global and Gulf of Mexico Experience: 21st Annual, 2001

Research paper thumbnail of Preliminary Results of Seismic and GPR Surveys on the Hells Gate lce Shelf (Victoria Land -Antarctica)

Research paper thumbnail of Overview of high resolution seismic prospecting in pre-Alpine and Alpine basins

Quaternary International, 2009

Several high resolution seismic surveys were conducted in Alpine and pre-Alpine Lombardia (Northe... more Several high resolution seismic surveys were conducted in Alpine and pre-Alpine Lombardia (Northern Italy) valleys in order to reconstruct the geometries of the sediments filling the valleys, their seismostratigraphy and the rock basement depth. The acquisitions were made mainly in the framework of the CARG (Geological CARtography) project for the new geological map of Italy and under different research programs between the National Research Council and Regione Lombardia. The research firstly shows the capability of seismic methods in support of Quaternary research, and secondly demonstrates the response of different geomorphological features in particular: glacial valley, terminal moraine, deeply eroded valley and alluvial plain. Different tests were carried out in the seismic surveys in order to optimize the acquisition techniques for shallow prospecting (100-1000 m depth). The data were processed by applying a seismic refraction inversion technique, in addition to standard reflection processing. The integration of the two data sets improves the seismic migration of the reflection sections and the seismic interpretation, producing wellconstrained seismo-stratigraphic sections coupled with an accurate seismic velocity section. The quality of the reflected events is generally higher in the glacial domain than in the fluvioglacial eroded valley, probably due to a stronger impedance contrast between soft sediments and hard rock. The terminal moraine sections show an intermediate quality of reflection record.

Research paper thumbnail of Permafrost distribution and rock glaciers in the livigno area (Northern Italy)

Permafrost and Periglacial Processes, 1994

Geophysical investigations were undertaken in the Livigno area (Sondrio, northern Italy) during 1... more Geophysical investigations were undertaken in the Livigno area (Sondrio, northern Italy) during 1991-92 at a number of sites where permafrost had been suggested through the application of other techniques, such as geomorphological studies, measurements of bottom temperature of winter snow cover (BTS), measurement of ground temperature in summertime (STG), and temperature of spring waters. Geoelectrical surveys confirm and characterize these permafrost occurrences. Furthermore, they indicate that, outside the rock glaciers, permafrost is also present in some gelifluction lobes. The permafrost bodies differ with regard to parameters such as resistivity, depth and thickness. Resistivity ranges from 18,000 to 560,000 R m (ohm metres), depth varies between 8 and 21.1 m, and the active layer is 2 to 4.7m thick in those bodies that can be considered active on the basis of morphological features.

Research paper thumbnail of Late Neogene–Quaternary evolution of the intermontane Clusone Basin(Southern Alps, Italy): integration of seismic and geological data

Journal of Quaternary Science, 2004

R. 2004. Late Neogene-Quaternary evolution of the intermontane Clusone Basin (Southern Alps, Ital... more R. 2004. Late Neogene-Quaternary evolution of the intermontane Clusone Basin (Southern Alps, Italy): integration of seismic and geological data.

Research paper thumbnail of The Terramare and the surrounding hydraulic structures: a geophysical survey of the Santa Rosa site at Poviglio (Bronze Age, northern Italy)

Journal of Archaeological Science, 2013

ABSTRACT The Terramara Santa Rosa is a Middle and Late Bronze Age archaeological site located in ... more ABSTRACT The Terramara Santa Rosa is a Middle and Late Bronze Age archaeological site located in the Po alluvial plain, northern Italy. It is constituted of two moated villages delimited by earthen ramparts. The peripheral structures of the site are sealed by fine-textured flood plain deposits and they have not been fully explored through excavation due to their large extent. Because the shape of the villages and their relation to moats and the fluvial network are of paramount importance to understanding the landscape management and the use of water resources in the Terramare civilisation, a geophysical survey was planned to extend the results of the existing archaeological excavations to the site scale. A frequency-domain electro-magnetic sounding (FDEM) and electrical resistivity imaging (ERI) covered an area of approximately 26 ha; ERI was conducted for a total length >9000 m. Despite the predominance of electrically conductive fine-textured sediments, electrical resistivity anomalies were observed and they were attributed to subtle lithological differences in the sedimentary context of the alluvial plain. The geophysical interpretation, after the calibration with the excavation data, revealed the structures of the Terramara and of the surrounding hydraulic network, which are not visible at the surface due to flood plain deposits. The Santa Rosa site was founded in a favourable geomorphological position, on the top of a crevasse splay lobe of the adjoining Po palaeo-channel, rising above the surrounding alluvial plain. The Terramara and their surroundings were delineated through an artificial modification of this pre-existing crevasse splay lobe and a well-targeted urban design, with the objective of diverting water, most likely from a palaeo-channel of the Po River, through the digging of peripheral moats used to collect water around the site and to distribute it to the surrounding fields for irrigation. The water management documented by this study in the Terramara Santa Rosa can be considered as paradigmatic for the whole Terramare civilisation, which is therefore responsible of the introduction of the irrigated agriculture into western Europe for the first time.

Research paper thumbnail of Monitoring the saltwater intrusion by time lapse electrical resistivity tomography: The Chioggia test site (Venice Lagoon, Italy)

Journal of Applied Geophysics, 2009

A novel experiment of time lapse electrical resistivity tomography (TL-ERT) aimed at monitoring t... more A novel experiment of time lapse electrical resistivity tomography (TL-ERT) aimed at monitoring the dynamics of the saltwater intrusion in the coastland bounding the southern Venice Lagoon is presented. A dedicated apparatus was developed and operated for about 9 months from November 2005. The system acquired ten resistivity tomograms per day, five of which with high resolution by a 97.5 m long and 2.5 m electrode spacing ERT line, and five by a 300 m long and 5 m electrode spacing line down to 50-60 m depth. The stratigraphy of a 50 m deep borehole drilled in the nearby of the ERT-TL alignment outlines the presence of a shallow phreatic aquifer in the shallower 12 m thick unit, followed by a semi-confined aquifer between 18 and 38 m depth and a locally confined aquifer down to the bottom. The shallow aquifer is the most contaminated by the salt intrusion with a minimum value of the formation resistivity equal to 1.0 ohm m corresponding to a salinity of 25-30 gr/l. A seasonal resistivity fluctuation is observed, with the saltwater front that intrudes landward during the autumn-winter season and moves back seaward in spring-summer. The first semi-confined aquifer is characterized by resistivity value of about 5 ohm m, while the confined aquifer is less contaminated showing resistivity values greater than 7.5 ohm m. For both the two confined aquifers the resistivity value rises at the beginning of the summer probably due to the seasonal fresh water recharge supplied regionally from the mainland. The TL-ERT data have been correlated with a number of environmental variables. A relationship is found between the resistivity in the upper 3-4 m of the phreatic aquifer and the rainfalls, and between the water level in the adjacent main channel and the resistivity down to about 10 m depth. With respect to the tidal regime, a daily/weekly correlation with resistivity changes is not evidenced, while a significant negative correlation coefficient exists at monthly to seasonal time scale for depths below 15 m. This experience suggests that TL-ERT is a powerful technique to perform multi-scale contaminant monitoring at different time scales.

Research paper thumbnail of Reconstructing hidden landscapes. DC and EM prospections in the Terramara Santa Rosa (bronze age settlement-northern Italy)

The Terramara Santa Rosa is an archaeological site, located in the Po alluvial plain (northern It... more The Terramara Santa Rosa is an archaeological site, located in the Po alluvial plain (northern Italy), which has been explored since 1986. As as seen by aerial photograph, Santa Rosa site is constituted by two moated villages of the Middle and Late Bronze Ages (1600-1150 BC), delimited by earth rampart. The smaller and older settlement (Villaggio Piccolo; VP), to the North, has a nearly circular shape and was founded during the Middle Bronze age, whereas the larger and younger one, delimited by a wide U-shaped rampart, ...

Research paper thumbnail of Early Pleistocene climate and geological evolution at the southern margin of the Alps: stratigraphy of the Leffe succession

Research paper thumbnail of Time variant tomography monitoring of the salt-water intrusion: geoelectrical survey of the test-site

Research paper thumbnail of Saltwater intrusion at the southern Venice lagoon boundary detected by time-lapse ERT

Research paper thumbnail of A dynamical approach to explain ice structures and complex morainic genesis on a partially grounded ice shelf (Hells Gate Ice Shelf, Victoria Land, Antarctica)

Research paper thumbnail of Is there a shallow body of lower crust under the Vulsinian Volcanic Complex?

Research paper thumbnail of Imaging sismico dei bacini quaternari orobici

... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quate... more ... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quaternari orobici Roberto de Franco1*, Fabrizio Berra2, Giancarlo ...

Research paper thumbnail of Fornaci dei Gorghi Fornaci di et�� romana e medievale a Lonato

Research paper thumbnail of Imaging the deposits that fill Valtellina (NW Italy) by seismic reflection investigation

Research paper thumbnail of Ice composition evidence of marine ice transfer along the bottom of a small Antarctic Ice Shelf

Geophysical Research Letters, 1991

The existence of marine ice transfer along the underside of the Hell's Gate Ice Shelf (Victoria L... more The existence of marine ice transfer along the underside of the Hell's Gate Ice Shelf (Victoria Land), is indicated by an isotopic and chemical study of ice cores. Because of top surface ablation, the marine ice formed at the ice shelfocean interface, ultimately appears at shelf surface. A succession of congelation, platelet and frazil ice is shown to occur. The combined study of stable isotope composition and of the sodium content of these different ice types proves to be a valuable tool for specifying the ice shelf-ocean interactions in this area. Two different freezing zones separated by a melting zone exist; the parent water for the frazil ice is meltwater from congelation ice which appears in the upstream zone. )

Research paper thumbnail of Imaging sismico dei bacini quaternari orobici

... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quate... more ... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quaternari orobici Roberto de Franco1*, Fabrizio Berra2, Giancarlo ...

Research paper thumbnail of The Northern Angolan Margin Imaged by Wide Angle Seismic Data

Petroleum Systems of Deep-Water Basins: Global and Gulf of Mexico Experience: 21st Annual, 2001

Research paper thumbnail of Preliminary Results of Seismic and GPR Surveys on the Hells Gate lce Shelf (Victoria Land -Antarctica)

Research paper thumbnail of Overview of high resolution seismic prospecting in pre-Alpine and Alpine basins

Quaternary International, 2009

Several high resolution seismic surveys were conducted in Alpine and pre-Alpine Lombardia (Northe... more Several high resolution seismic surveys were conducted in Alpine and pre-Alpine Lombardia (Northern Italy) valleys in order to reconstruct the geometries of the sediments filling the valleys, their seismostratigraphy and the rock basement depth. The acquisitions were made mainly in the framework of the CARG (Geological CARtography) project for the new geological map of Italy and under different research programs between the National Research Council and Regione Lombardia. The research firstly shows the capability of seismic methods in support of Quaternary research, and secondly demonstrates the response of different geomorphological features in particular: glacial valley, terminal moraine, deeply eroded valley and alluvial plain. Different tests were carried out in the seismic surveys in order to optimize the acquisition techniques for shallow prospecting (100-1000 m depth). The data were processed by applying a seismic refraction inversion technique, in addition to standard reflection processing. The integration of the two data sets improves the seismic migration of the reflection sections and the seismic interpretation, producing wellconstrained seismo-stratigraphic sections coupled with an accurate seismic velocity section. The quality of the reflected events is generally higher in the glacial domain than in the fluvioglacial eroded valley, probably due to a stronger impedance contrast between soft sediments and hard rock. The terminal moraine sections show an intermediate quality of reflection record.

Research paper thumbnail of Permafrost distribution and rock glaciers in the livigno area (Northern Italy)

Permafrost and Periglacial Processes, 1994

Geophysical investigations were undertaken in the Livigno area (Sondrio, northern Italy) during 1... more Geophysical investigations were undertaken in the Livigno area (Sondrio, northern Italy) during 1991-92 at a number of sites where permafrost had been suggested through the application of other techniques, such as geomorphological studies, measurements of bottom temperature of winter snow cover (BTS), measurement of ground temperature in summertime (STG), and temperature of spring waters. Geoelectrical surveys confirm and characterize these permafrost occurrences. Furthermore, they indicate that, outside the rock glaciers, permafrost is also present in some gelifluction lobes. The permafrost bodies differ with regard to parameters such as resistivity, depth and thickness. Resistivity ranges from 18,000 to 560,000 R m (ohm metres), depth varies between 8 and 21.1 m, and the active layer is 2 to 4.7m thick in those bodies that can be considered active on the basis of morphological features.

Research paper thumbnail of Late Neogene–Quaternary evolution of the intermontane Clusone Basin(Southern Alps, Italy): integration of seismic and geological data

Journal of Quaternary Science, 2004

R. 2004. Late Neogene-Quaternary evolution of the intermontane Clusone Basin (Southern Alps, Ital... more R. 2004. Late Neogene-Quaternary evolution of the intermontane Clusone Basin (Southern Alps, Italy): integration of seismic and geological data.

Research paper thumbnail of The Terramare and the surrounding hydraulic structures: a geophysical survey of the Santa Rosa site at Poviglio (Bronze Age, northern Italy)

Journal of Archaeological Science, 2013

ABSTRACT The Terramara Santa Rosa is a Middle and Late Bronze Age archaeological site located in ... more ABSTRACT The Terramara Santa Rosa is a Middle and Late Bronze Age archaeological site located in the Po alluvial plain, northern Italy. It is constituted of two moated villages delimited by earthen ramparts. The peripheral structures of the site are sealed by fine-textured flood plain deposits and they have not been fully explored through excavation due to their large extent. Because the shape of the villages and their relation to moats and the fluvial network are of paramount importance to understanding the landscape management and the use of water resources in the Terramare civilisation, a geophysical survey was planned to extend the results of the existing archaeological excavations to the site scale. A frequency-domain electro-magnetic sounding (FDEM) and electrical resistivity imaging (ERI) covered an area of approximately 26 ha; ERI was conducted for a total length >9000 m. Despite the predominance of electrically conductive fine-textured sediments, electrical resistivity anomalies were observed and they were attributed to subtle lithological differences in the sedimentary context of the alluvial plain. The geophysical interpretation, after the calibration with the excavation data, revealed the structures of the Terramara and of the surrounding hydraulic network, which are not visible at the surface due to flood plain deposits. The Santa Rosa site was founded in a favourable geomorphological position, on the top of a crevasse splay lobe of the adjoining Po palaeo-channel, rising above the surrounding alluvial plain. The Terramara and their surroundings were delineated through an artificial modification of this pre-existing crevasse splay lobe and a well-targeted urban design, with the objective of diverting water, most likely from a palaeo-channel of the Po River, through the digging of peripheral moats used to collect water around the site and to distribute it to the surrounding fields for irrigation. The water management documented by this study in the Terramara Santa Rosa can be considered as paradigmatic for the whole Terramare civilisation, which is therefore responsible of the introduction of the irrigated agriculture into western Europe for the first time.

Research paper thumbnail of Monitoring the saltwater intrusion by time lapse electrical resistivity tomography: The Chioggia test site (Venice Lagoon, Italy)

Journal of Applied Geophysics, 2009

A novel experiment of time lapse electrical resistivity tomography (TL-ERT) aimed at monitoring t... more A novel experiment of time lapse electrical resistivity tomography (TL-ERT) aimed at monitoring the dynamics of the saltwater intrusion in the coastland bounding the southern Venice Lagoon is presented. A dedicated apparatus was developed and operated for about 9 months from November 2005. The system acquired ten resistivity tomograms per day, five of which with high resolution by a 97.5 m long and 2.5 m electrode spacing ERT line, and five by a 300 m long and 5 m electrode spacing line down to 50-60 m depth. The stratigraphy of a 50 m deep borehole drilled in the nearby of the ERT-TL alignment outlines the presence of a shallow phreatic aquifer in the shallower 12 m thick unit, followed by a semi-confined aquifer between 18 and 38 m depth and a locally confined aquifer down to the bottom. The shallow aquifer is the most contaminated by the salt intrusion with a minimum value of the formation resistivity equal to 1.0 ohm m corresponding to a salinity of 25-30 gr/l. A seasonal resistivity fluctuation is observed, with the saltwater front that intrudes landward during the autumn-winter season and moves back seaward in spring-summer. The first semi-confined aquifer is characterized by resistivity value of about 5 ohm m, while the confined aquifer is less contaminated showing resistivity values greater than 7.5 ohm m. For both the two confined aquifers the resistivity value rises at the beginning of the summer probably due to the seasonal fresh water recharge supplied regionally from the mainland. The TL-ERT data have been correlated with a number of environmental variables. A relationship is found between the resistivity in the upper 3-4 m of the phreatic aquifer and the rainfalls, and between the water level in the adjacent main channel and the resistivity down to about 10 m depth. With respect to the tidal regime, a daily/weekly correlation with resistivity changes is not evidenced, while a significant negative correlation coefficient exists at monthly to seasonal time scale for depths below 15 m. This experience suggests that TL-ERT is a powerful technique to perform multi-scale contaminant monitoring at different time scales.

Research paper thumbnail of Reconstructing hidden landscapes. DC and EM prospections in the Terramara Santa Rosa (bronze age settlement-northern Italy)

The Terramara Santa Rosa is an archaeological site, located in the Po alluvial plain (northern It... more The Terramara Santa Rosa is an archaeological site, located in the Po alluvial plain (northern Italy), which has been explored since 1986. As as seen by aerial photograph, Santa Rosa site is constituted by two moated villages of the Middle and Late Bronze Ages (1600-1150 BC), delimited by earth rampart. The smaller and older settlement (Villaggio Piccolo; VP), to the North, has a nearly circular shape and was founded during the Middle Bronze age, whereas the larger and younger one, delimited by a wide U-shaped rampart, ...

Research paper thumbnail of Early Pleistocene climate and geological evolution at the southern margin of the Alps: stratigraphy of the Leffe succession

Research paper thumbnail of Time variant tomography monitoring of the salt-water intrusion: geoelectrical survey of the test-site

Research paper thumbnail of Saltwater intrusion at the southern Venice lagoon boundary detected by time-lapse ERT

Research paper thumbnail of A dynamical approach to explain ice structures and complex morainic genesis on a partially grounded ice shelf (Hells Gate Ice Shelf, Victoria Land, Antarctica)

Research paper thumbnail of Is there a shallow body of lower crust under the Vulsinian Volcanic Complex?

Research paper thumbnail of Imaging sismico dei bacini quaternari orobici

... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quate... more ... PIÀNICO–SÈLLERE MILANO E BERGAMO, 15–16 GIUGNO 2004 _____ 13 Imaging sismico dei bacini quaternari orobici Roberto de Franco1*, Fabrizio Berra2, Giancarlo ...

Research paper thumbnail of Fornaci dei Gorghi Fornaci di et�� romana e medievale a Lonato

Research paper thumbnail of Imaging the deposits that fill Valtellina (NW Italy) by seismic reflection investigation

Research paper thumbnail of Ice composition evidence of marine ice transfer along the bottom of a small Antarctic Ice Shelf

Geophysical Research Letters, 1991

The existence of marine ice transfer along the underside of the Hell's Gate Ice Shelf (Victoria L... more The existence of marine ice transfer along the underside of the Hell's Gate Ice Shelf (Victoria Land), is indicated by an isotopic and chemical study of ice cores. Because of top surface ablation, the marine ice formed at the ice shelfocean interface, ultimately appears at shelf surface. A succession of congelation, platelet and frazil ice is shown to occur. The combined study of stable isotope composition and of the sodium content of these different ice types proves to be a valuable tool for specifying the ice shelf-ocean interactions in this area. Two different freezing zones separated by a melting zone exist; the parent water for the frazil ice is meltwater from congelation ice which appears in the upstream zone. )