1,029 research outputs found
Very high resolution seismic surveys in the lagoon and gulf of Venice shallow waters
No full textWithin the framework of the geological mapping of the Venice area (CARG Project: Map Sheet 128 “Venezia” and Map Sheet 148-149 “Chioggia-Malamocco”) a very high resolution seismic survey (VHRS) was carried out to correlate data from hundreds of cores with the main aim to map the depth of the Late Pleistocene and Holocene unconformity (Brancolini et al., 2005; Rizzetto et al., 2005; Tosi et al., 2006a,b). Due to logistic and technical limits, the acquisition of seismic survey in the Venice Lagoon was restricted to the channels with more of 5 m water depth, most of them artificial or dredged. A new survey, with the aim to extend the VHRS surveys to the shallow water, such as the tidal flats, is in progress within the Co.Ri.La. Project framework (3.16 Subproject). The Co.Ri.La 3.16 Subproject is based on an acquisition system installed on a boat with a very shallow draught. The new survey will allow the detection and mapping of many interesting geological-geomorphologic structures, i.e. paleoriver beds, ancient lagoon channels and shoreline ridges, that are like-outcropping, and that have been only partially recognized in the previous surveys.PublishedBarcelona (Spain)7A. Geofisica di esplorazioneope
Very high resolution seismic surveys in the lagoon and gulf of Venice shallow waters
No full textWithin the framework of the geological mapping of the Venice area (CARG Project: Map Sheet 128 “Venezia” and Map Sheet 148-149 “Chioggia-Malamocco”) a very high resolution seismic survey (VHRS) was carried out to correlate data from hundreds of cores with the main aim to map the depth of the Late Pleistocene and Holocene unconformity (Brancolini et al., 2005; Rizzetto et al., 2005; Tosi et al., 2006a,b). Due to logistic and technical limits, the acquisition of seismic survey in the Venice Lagoon was restricted to the channels with more of 5 m water depth, most of them artificial or dredged. A new survey, with the aim to extend the VHRS surveys to the shallow water, such as the tidal flats, is in progress within the Co.Ri.La. Project framework (3.16 Subproject). The Co.Ri.La 3.16 Subproject is based on an acquisition system installed on a boat with a very shallow draught. The new survey will allow the detection and mapping of many interesting geological-geomorphologic structures, i.e. paleoriver beds, ancient lagoon channels and shoreline ridges, that are like-outcropping, and that have been only partially recognized in the previous surveys.PublishedBarcelona (Spain)7A. Geofisica di esplorazioneope
CONTRIBUTION OF SEISMIC PROFILES, HISTORICAL MAPS, AND DIGITAL ELEVATION MODEL TO DEFINE BURIED GEOMORPHOLOGICAL FEATURES IN THE VENICE LAGOON SUBSOIL (ITALY)
No full textRecently, the integrated analysis of Very High Resolution Seismic (VHRS) profiles, satellite images, aerial photographs, maps, and topographic/bathymetric data has given an important contribution to the identification of buried geomorphological features in the Venice lagoon subsoil down to about 30 m b.s.l.. Investigations allow to attribute these features to the Late Pleistocene and the Holocene and to point out their relation with the evolution of the lagoon basin.
Results of this study are also assuming great importance in relation to coastal environmental problems. Relict sandy geomorphological features, characterized by high permeability, act as preferred pathways for groundwater flow and solute transport, enhancing saltwater intrusion in the watershed (Carbognin & Tosi, 2003; Carbognin et al., 2005; Pousa et al., 2007). Furthermore, salinization process can also trigger land subsidence induced by clayey particles rearrangement (Meade, 1964).
In addition, the different kinds of deposits that characterize geomorphological features are responsible for a differential lowering of the territory (Teatini et al., 2005).
Aerial photograph and satellite image interpretations, analysis of historical and recent maps, field surveys, and topographic/bathymetric investigations were first used to identify the main buried and surface geomorphological features. Afterwards, an important contribution to the present study was given by a single channel VHR seismic system, optimized for surveys in shallow water less than 1 m depth (Brancolini et al., 2006; Brancolini et al., 2007).
Seismic profiles were calibrated and validated using geological information obtained from existing cores.
The detailed reconstruction of the seismic-morpho-stratigraphic units present in the subsoil of the Venice Lagoon is still in progress. It is obtained integrating results of the investigations previously described with sedimentological, stratigraphic, geotechnical, mineralogical, textural, and paleoenvironmental data, and 14C dating (Serandrei Barbero et al., 2006; Tosi et al., 2007a; Tosi et al., 2007b).
The combined interpretation of results obtained from remote sensing investigations, topographic/bathymetric measurements, VHRS surveys, and analysis of multidisciplinary geological data allowed the discovery and characterization of buried paleoriver beds, ancient tidal channels, and paleobeach ridges and pointed out the relation among geomorphological features occurring in the lagoon basin and in the watershed.
In fact, most of the features recognized in the mainland, which apparently come to an end in correspondence to the lagoon margin, continue into the lagoon basin, where their identification is made difficult by the presence of water and by depositional/erosive processes active in this kind of environment.
Data show that relict geomorphological features composed of high permeability deposits provide the hydraulic connection between freshwater aquifers and the sea. In particular, results of the present study point out that well developed paleoriver systems, intersecting the southern lagoon margin and the nearby coastline and characterized by permeable sediments, represent preferential way of communication among waters having different salinity. By contrast thick silty-clayey layers preclude the salty pollution in the aquifers from the lagoon and the sea.
As pointed out close to the lagoon margin (Rizzetto et al., 2003), the different kinds of deposits, related to the presence of distinct geomorphological features, contribute to the differential lowering of the lagoon basin (Teatini et al., 2005). In particular, organic soils correspond to highly sinking areas, whereas sandy-silty sediments, which constitute fluvial and beach ridges, are more stable.
Future investigations have to be addressed to the quantitative geomorphological analysis aimed to know the past hydrologic conditions of the drainage systems, and to analyze the formative processes that control the morphological setting and evolution of lowland fluvial river and tidal creek systems.PublishedMunich, Germany6A. Monitoraggio ambientale, sicurezza e territorioope
CONTRIBUTION OF SEISMIC PROFILES, HISTORICAL MAPS, AND DIGITAL ELEVATION MODEL TO DEFINE BURIED GEOMORPHOLOGICAL FEATURES IN THE VENICE LAGOON SUBSOIL (ITALY)
No full textRecently, the integrated analysis of Very High Resolution Seismic (VHRS) profiles, satellite images, aerial photographs, maps, and topographic/bathymetric data has given an important contribution to the identification of buried geomorphological features in the Venice lagoon subsoil down to about 30 m b.s.l.. Investigations allow to attribute these features to the Late Pleistocene and the Holocene and to point out their relation with the evolution of the lagoon basin.
Results of this study are also assuming great importance in relation to coastal environmental problems. Relict sandy geomorphological features, characterized by high permeability, act as preferred pathways for groundwater flow and solute transport, enhancing saltwater intrusion in the watershed (Carbognin & Tosi, 2003; Carbognin et al., 2005; Pousa et al., 2007). Furthermore, salinization process can also trigger land subsidence induced by clayey particles rearrangement (Meade, 1964).
In addition, the different kinds of deposits that characterize geomorphological features are responsible for a differential lowering of the territory (Teatini et al., 2005).
Aerial photograph and satellite image interpretations, analysis of historical and recent maps, field surveys, and topographic/bathymetric investigations were first used to identify the main buried and surface geomorphological features. Afterwards, an important contribution to the present study was given by a single channel VHR seismic system, optimized for surveys in shallow water less than 1 m depth (Brancolini et al., 2006; Brancolini et al., 2007).
Seismic profiles were calibrated and validated using geological information obtained from existing cores.
The detailed reconstruction of the seismic-morpho-stratigraphic units present in the subsoil of the Venice Lagoon is still in progress. It is obtained integrating results of the investigations previously described with sedimentological, stratigraphic, geotechnical, mineralogical, textural, and paleoenvironmental data, and 14C dating (Serandrei Barbero et al., 2006; Tosi et al., 2007a; Tosi et al., 2007b).
The combined interpretation of results obtained from remote sensing investigations, topographic/bathymetric measurements, VHRS surveys, and analysis of multidisciplinary geological data allowed the discovery and characterization of buried paleoriver beds, ancient tidal channels, and paleobeach ridges and pointed out the relation among geomorphological features occurring in the lagoon basin and in the watershed.
In fact, most of the features recognized in the mainland, which apparently come to an end in correspondence to the lagoon margin, continue into the lagoon basin, where their identification is made difficult by the presence of water and by depositional/erosive processes active in this kind of environment.
Data show that relict geomorphological features composed of high permeability deposits provide the hydraulic connection between freshwater aquifers and the sea. In particular, results of the present study point out that well developed paleoriver systems, intersecting the southern lagoon margin and the nearby coastline and characterized by permeable sediments, represent preferential way of communication among waters having different salinity. By contrast thick silty-clayey layers preclude the salty pollution in the aquifers from the lagoon and the sea.
As pointed out close to the lagoon margin (Rizzetto et al., 2003), the different kinds of deposits, related to the presence of distinct geomorphological features, contribute to the differential lowering of the lagoon basin (Teatini et al., 2005). In particular, organic soils correspond to highly sinking areas, whereas sandy-silty sediments, which constitute fluvial and beach ridges, are more stable.
Future investigations have to be addressed to the quantitative geomorphological analysis aimed to know the past hydrologic conditions of the drainage systems, and to analyze the formative processes that control the morphological setting and evolution of lowland fluvial river and tidal creek systems.PublishedMunich, Germany6A. Monitoraggio ambientale, sicurezza e territorioope
STUDI CHIMICO-MOLECOLARI DI PROFILI NUTRIZIONALI IDENTIFICATIVI DI DIVERSE SPECIE ITTICHE
No full textLo scopo del progetto di ricerca, sviluppato durante il triennio 2014-2016, è il miglioramento delle conoscenze dei profili nutrizionali identificativi di diverse specie ittiche, con un approccio che combina conoscenze nell’ambito delle analisi chimiche e del campo genetico-molecolare. L’obiettivo del lavoro è stato tradurre tutti i dati raccolti dalle analisi in informazioni utili in un database pubblico chiamato Ittiobase. Lo studio nasce dalla collaborazione tra il Dipartimento di Scienze Chimiche e Farmaceutiche dell’Università di Ferrara e l’Istituto Zooprofilattico Sperimentale delle Venezie – CSI di Adria. La prima parte della ricerca è stato lo studio preliminare delle specie ittiche più rappresentative della pesca e dell’acquacoltura italiana. Sono state raccolte informazioni sulle specie, maggiormente commercializzate e presenti sul mercato nazionale e sono state reperite 13 specie ittiche. Per ogni specie, sono stati campionati una decina di soggetti; ogni esemplare è stato identificato morfologicamente, classificato e fotografato. La seconda parte ha previsto l’analisi genetica delle specie campionate. Sono stati analizzati 118 campioni. Le analisi molecolari hanno previsto tre passaggi: 1) estrazione degli acidi nucleici dai tessuti muscolari, 2) quantificazione del DNA (ng/μL), 3) amplificazione del DNA, utilizzando una metodica di PCR end-point. Il Citocromo Ossidasi Primo (COI) è il gene di elezione per analisi di Barcoding. L’identità (genere e specie) per ciascun campione, riscontrata con le analisi biomolecolari, ha confermato i risultati preliminari dell’identificazione morfologica. Sulle sequenze ottenute è stata osservata una discreta variabilità delle diverse specie, la specie con maggiore variabilità è stata la Sardina; a seguire il Tombarello ed il Pesce sciabola. Con assenza di variabilità è il Tonno rosso, ma ciò conferma i dati presenti anche in altri lavori. Nella terza parte le analisi chimiche sono state eseguite su matrici di tessuto muscolare congelato per valutare il profilo lipidico delle diverse specie. Sono stati valutati e confrontati i profili ottenuti, evidenziando possibili differenze quali-quantitative tra le diverse specie. I risultati sono stati molto interessanti, in molte specie come Sardina, tonno Alalunga, Sgombro e Tombarello il DHA ha un range tra il 19% ed il 22% confermando i risultati di diversi studi di inserire queste categorie di pesce nella dieta per un corretto apporto di omega-3. Dato altrettanto interessante e non atteso è stato l’alto contenuto (range tra il 2% ed 8%) dell’acido linolenico, nelle specie d’acqua dolce come Temolo, Vairone ed Agone; ciò suggerisce una maggiore valorizzazione di queste specie ittiche all’interno della dieta del consumatore finale. Nell’analisi delle componenti principali (PCA) si osserva in generale la formazione di cluster ben definiti e caratterizzanti per ciascuna specie come per esempio Temolo, Sgombro e Sardina. Per altre specie come Tonno rosso il cluster diventa più ampiamente distribuito; ciò può essere legato alla presenza di diversi areali di pesca ed alla taglia diversamente omogenea per alcune specie. Nella quarta parte è stato previsto uno studio preliminare dei campioni, già analizzati chimicamente e geneticamente, di alcune specie pelagiche come Scombro, tonno Alalunga, Tonno rosso e Tombarello, utilizzando gli isotopi stabili del carbonio e dell’azoto. L’obiettivo è stato di studiare come la combinazione tra profili degli acidi grassi e misurazioni isotopiche potessero essere un nuovo strumento per la tracciabilità e caratterizzazione di queste specie. Il Barcoding non riesce ad essere discriminante per il genere Thunnus mentre l'approccio analitico integrato, ha mostrato una buona discriminazione delle specie e una separazione geografica spaziale dei due predatori Alalunga e Tonno rossoThe research project developed during the period 2014-2016 and its purpose is the improvement of information and knowledge of identifying nutrient profiles of different fish species. We use an approach that combines chemical and genetic-molecular analysis. The aim of the work was to translate all data of research into useful information for inclusion in a public database: ITTIOBASE. This project is a collaboration between the Department of Chemical and Pharmaceutical Sciences of the University of Ferrara and the Istitute Zooprofilattico Sperimentale delle Venezie - CSI Adria. The first part of research has been facing a preliminary study of the most representative species of the Italian fisheries and aquaculture. Information on the fish species was collected from local market and we founded 13 different species of fish. For each species, we used ten animals to be analyzed; each specimen was morphologically identified, classified and photographed. The second part of the project involved the genetic analysis. We analyzed 118 samples. Molecular analyzes provided three steps: (1) extraction of nucleic acids from muscle tissue samples, (2) the quantification of DNA (ng/μL) and (3) amplification with PCR end-point. The Cytochrome Oxidase First (COI) is gene target for Barcoding analysis. Sequences were used in studying genetic variability; we observe how this parameter could be present in a highly conserved gene as the cytochrome oxidase I. A clear variability can be noticed in some different species, the one with greater variability was the Sardina pilchardus; followed by frigate Auxis rochei and Lepidopus caudatus. In agreement with other published studies we can highlight absence of variability in the Thunnus thynnus. This lack of variability of a mitochondrial gene leads to the difficulty of the technique barcoding going to correctly identify the species of the genus Thunnus. In the third part of the project, chemical analysis were performed on frozen muscle tissue to assess the lipid profile of the different species. The results are very interesting: in many species such as Sardina pilchardus, Auxis rochei, Thunnus alalunga and Scomber scombrus, the DHA is included in a range between 19% and 22%. It is in agreement with the results of many studies than include these categories of fish in the diet for proper intake of omega-3. Another interesting and not expected data is the high content (range between 2% and 8%) of linolenic acid. This is the precursor of EPA and DHA, in the fresh water species such as Telestes muticellus, Alosa fallax lacustris and Thymallus thymallus. This suggests a greater enhancement of these fish species in the diet, through an increasing information to the final consumer. The PCA analysis of the main components show the formation of well-defined and characteristic clusters for each species. For some species such as Thymallus thymallus, Scomber scombrus and Sardina pilchardus, the clusters are well defined and compact, for other species like Thunnus thynnus, the cluster becomes more widely distributed; this can be linked to the presence of different distribution areas of fishing and otherwise homogeneous size for some species. In the fourth part of the project, the samples of pelagic species are been analyzed in a preliminary study. Scomber scombrus, Thunnus alalunga, Thunnus thynnus, Auxis rochei, belonging to the family Scombridae, are used in techniques of stable isotopes of carbon and nitrogen. The aim was to study how the combination of fatty acid profiles and isotopic measurements could be a new tool for tracking and characterization of these species. In fact the integrated analytical approach, in this work, showed good discrimination of species and a spatial geographic separation in the two largest predators Thunnus alalunga and Thunnus thynnus. All information, derived from different techniques, were included in ITTIOBASE database
El rol de la evapotranspiración en la geohidrología del humedal de la Planicie Costera de Ajó (provincia de Buenos Aires)
No full textFil: Carol, Eleonora Silvina. Cátedra de Hidrología General. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Kruse, Eduardo Emilio. Cátedra de Hidrología General. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Braga, Federica. Istituto di Scienze Marine. Consiglio Nazionale delle Ricerche. Venezia; ItalyFil: Tosi, Luigi. Istituto di Scienze Marine. Consiglio Nazionale delle Ricerche. Venezia; Ital
Federica Boldrini, Per la storia delle leggi suntuarie in Italia nei secoli XV-XVI. Il Tractatus de ornatum mulierum di Orfeo Cancellieri. Archivio per la storia del diritto medioevale e moderno. Studi e testi, Miscellanee raccolte da Filippo Liotta, 18. (Monduzzi Editoriale), Milano, Monduzzi, 2019 24x17cm 402 p. € 56,00. ISBN 97-88-6521-097-0
No full textRecensione al volume di Federica Boldrini, Per la storia delle leggi suntuarie in Italia nei secoli XV-XVI. Il Tractatus de ornatum mulierum di Orfeo Cancellieri. Archivio per la storia del diritto medioevale e moderno. Studi e testi, Miscellanee raccolte da Filippo Liotta, 18. (Monduzzi Editoriale), Milano, Monduzzi, 2019
Análisis temporal de las modificaciones en los médanos del Partido de la Costa y su relación con los recursos hídricos
No full textFil: Carretero, Silvina Claudia. Cátedra de Hidrología General. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Braga, Federica. Istituto di Scienze Marine Consiglio Nazionale delle Ricerche. Venezia; ItaliaFil: Kruse, Eduardo Emilio. Cátedra de Hidrología General. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Tosi, Luigi. Cátedra de Hidrología General. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentin
Saltwater intrusion in the southern catchment basin of the Venice Lagoon, Italy
No full textThe investigated area is the catchment located south of the Venice Lagoon, where multidisciplinary studies (ISES Project, Co.Ri.La. 3.10 Project)1 provided evidence of a phreatic aquifer contamination due to saltwater intrusion from the sea and the lagoon. The ground elevation of the territory, generally below the mean sea level up to -4 m, enhances the process especially in those sectors where land subsidence, mainly due to peat soil oxidation in close connection with the agricultural practices, is responsible for a subsidence rate varying between 1.5 and 2 cm/yr (Gambolati et al., 2005).PublishedBarcelona (Spain)6A. Monitoraggio ambientale, sicurezza e territorioope
PRELIMINARY STUDY OF GEOMORPHOLOGICAL FEATURES DISCOVERED IN TIDAL FLATS OF THE VENICE LAGOON BY VHR SEISMIC SURVEYS
No full textAbstract.
Available sedimentological, stratigraphic and bathymetric data, historical maps and a number of new Very High Resolution Seismic (VHRS) surveys acquired in the lagoon shallows were processed. Collected data allowed the characterization of the geomorphological setting at regional scale, whereas new VHRS data locally provided details of feature extent.
In particular the new VHRS surveys pointed out, for the first time, the occurrence and, in some cases, the evolution of buried and surface morphological features found in the lagoon shallows.
Riassunto.
In questo studio sono stati elaborati i dati sedimentologici, stratigrafici, batimetrici e cartografici disponibili pregressi e una serie di nuovi rilievi sismici ad altissima risoluzione eseguiti sui bassi fondali lagunari. I dati raccolti hanno consentito di individuare le strutture geomorfologiche a scala regionale mentre quelli di nuova acquisizione hanno fornito una serie di dettagli locali delle stesse strutture.
In particolare, i nuovi dati sismici hanno permesso di individuare per la prima volta la presenza di elementi geomorfologici nei bassifondi lagunari ed in alcuni casi di caratterizzare la loro evoluzione spazio-temporale.PublishedVenice, Italy7A. Geofisica di esplorazioneope
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