150 research outputs found
Rischio da inondazione costiera in nord Adriatico: identificazione di hot-spot tramite accoppiamento di scenari episodici e di innalzamento del livello del mare
No full textPresentazione integrale. Nessun Abstrac
Foredune classification and morphodynamic processes along the Veneto coasts (N. Adriatic, Italy
No full textDistribution of the marine and transitional terraces (Holocene) and geomorphological map of the Punta Catalina, Tierra del Fuego, Straits of Magellan, Chile (1:50,000 scale map – Map n° 4/12 - Second Edition)
No full textPrevious studies, carried out by the “Dipartimento di Scienze Geologiche, Ambientali e Marine” of “Università di Trieste” within the “Programma Nazionale di Ricerche in Antartide” (P.N.R.A.) and by the “Dipartimento di Scienze della Terra” of “Università di Cagliari” within the project “PVS – Regione Autonoma della Sardegna – Cile”, on the Straits of Magellan were mainly direct ed at sedimentological research on the sea bottoms and coastal belt of the eastern section (Atlantic opening). Similar wide ranging research was carried out also on the coastal belt of the western section (Pacific opening) from sea vessels, since it was inaccessible by land which is typically sheer (fiords). The first coastal studies were connected with sedimentological studies of the bottom, but were limited to research on the source of transport of the sediments as well as a regional definition of morphostructural units. Subsequent research along the coastal belt was carried out in greater detail with mapping of morphological units. During this second phase, greater attention was given to the study of palaeo-shorelines and different terrace orders of presumed marine and transitional origin (Brambati et alii, 1993a; 1993b).
On the basis of initial geological, sedimentological and geomorphological results obtained, we made a zoning of the coastal belts along the Atlantic opening of the Straits which enabled us to print three sheets on a scale of 1:200,000 (De Muro et alii 1995, Brambati et alii 1995a e 1995b, Di Grande et alii 1995).
Detailed studies and maps (scale 1:50,000) of the terraced sequences linked to Holo-Pleistocene glacio-eustatic variations are in course. The aim is to publish an Atlas accompanied by 12 geomorphological maps (of which this is the fourth) topographically based on 28 Chilean I.G.M. 1:50,000 scale maps of the area between Punta Dungeness and Bahía Inutíl (Di Grande et alii 1996a, 1996b and 1996c; De Muro et alii 1996 e 1997).
The eastern entrance of the Straits of Magellan is characterized by the presence of two truncate cuspate forelands, typical high energy accretionary morphologies, formed during Holocene regressive phase. The northern foreland is called Punta Dungeness, in honour of the best known similar form in UK, and could be originated about 4.2 ka BP (Uribe and Zamora, 1981). The southern foreland, called Punta Catalina, lies in the north-easternmost part of Tierra del Fuego. Ir shows a strong analogy with Punta Dungeness foreland, and could be formed and developed as the opposite morphology (Fontolan and Simeoni, 1999). On the basis of air-photo interpretation, togher with field survey, almost nine different accretionary phases of Punta Catalina foreland can be recognized
DISTRIBUTION OF THE MARINE AND TRANSITIONAL TERRACES (HOLOCENE) AND GEOMORPHOLOGICAL MAP OF THE PUNTA CATALINA, TIERRA DEL FUEGO, STRAITS OF MAGELLAN, CHILE (1:50,000 SCALE MAP) First Edition
No full textPrevious studies, carried out by the “Dipartimento di Scienze Geologiche, Ambientali e Marine” of “Università di Trieste” within the “Programma Nazionale di Ricerche in Antartide” (P.N.R.A.) and by the “Dipartimento di Scienze della Terra” of “Università di Cagliari” within the project “PVS – Regione Autonoma della Sardegna – Cile”, on the Straits of Magellan were mainly direct ed at sedimentological research on the sea bottoms and coastal belt of the eastern section (Atlantic opening). Similar wide ranging research was carried out also on the coastal belt of the western section (Pacific opening) from sea vessels, since it was inaccessible by land which is typically sheer (fiords). The first coastal studies were connected with sedimentological studies of the bottom, but were limited to research on the source of transport of the sediments as well as a regional definition of morphostructural units. Subsequent research along the coastal belt was carried out in greater detail with mapping of morphological units. During this second phase, greater attention was given to the study of palaeo-shorelines and different terrace orders of presumed marine and transitional origin (Brambati et alii, 1993a; 1993b).
On the basis of initial geological, sedimentological and geomorphological results obtained, we made a zoning of the coastal belts along the Atlantic opening of the Straits which enabled us to print three sheets on a scale of 1:200,000 (De Muro et alii 1995, Brambati et alii 1995a e 1995b, Di Grande et alii 1995).
Detailed studies and maps (scale 1:50,000) of the terraced sequences linked to Holo-Pleistocene glacio-eustatic variations are in course. The aim is to publish an Atlas accompanied by 12 geomorphological maps (of which this is the fourth) topographically based on 28 Chilean I.G.M. 1:50,000 scale maps of the area between Punta Dungeness and Bahía Inutíl (Di Grande et alii 1996a, 1996b and 1996c; De Muro et alii 1996 e 1997).
The eastern entrance of the Straits of Magellan is characterized by the presence of two truncate cuspate forelands, typical high energy accretionary morphologies, formed during Holocene regressive phase. The northern foreland is called Punta Dungeness, in honour of the best known similar form in UK, and could be originated about 4.2 ka BP (Uribe and Zamora, 1981). The southern foreland, called Punta Catalina, lies in the north-easternmost part of Tierra del Fuego. Ir shows a strong analogy with Punta Dungeness foreland, and could be formed and developed as the opposite morphology (Fontolan and Simeoni, 1999). On the basis of air-photo interpretation, togher with field survey, almost nine different accretionary phases of Punta Catalina foreland can be recognized
Magnetic susceptibility of surficial sediments from the Strait of Magellan
No full textMagnetic susceptibility (MS) was measured on the bulk samples (MSmv) and on the following three size fractions: gravel (MSg), sand (MSs) and mud (MSf). There is a direct correlation between MSmv on the one side, and MSg and MSs on the other; the MS of the sand and gravel fractions probably determine the bulk average. Furthermore, MS decreases with increase in mud content of the sediment. The MSmv, MSg and MSs values are independent of the depth of sampling; this is due to the change in texture of the sediments, which is controlled by the complex fluid-dynamics of the currents in the Strait. -from Author
L’evento trasgressivo Tirreniano nell’area di Venezia (Malamocco, sondaggio CH1M): evidenze micro paleontologiche e sedimentologiche.
No full textThe Legacy of the Idrija Mine Twenty-Five Years after Closing: Is Mercury in the Water Column of the Gulf of Trieste Still an Environmental Issue?
No full textMercury (Hg) contamination in the Gulf of Trieste (northern Adriatic Sea) due to mining activity in Idrija (Slovenia) still represents an issue of environmental concern. The Isonzo/Soča River’s freshwater inputs have been identified as the main source of Hg into the Gulf, especially following periods of medium-high discharge. This research aims to evaluate the occurrence and distribution of dissolved (DHg) and particulate (PHg) Hg along the water column in the northernmost sector of the Gulf, a shallow and sheltered embayment suitable for the accumulation of fine sediments. Sediment and water samples were collected under unperturbed and perturbed environmental conditions induced by natural and anthropogenic factors. Mercury in the sediments (0.77–6.39 μg g−1) and its relationship to grain size were found to be consistent with previous research focused on the entire Gulf, testifying to the common origin of the sediment. Results showed a notable variability of DHg
Monitoraggio geomorfologico delle dune e della spiaggia dell'Oasi LIPU di Ca' Roman (VE)
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