2,675 research outputs found
Early Holocene sea-level jumps: evidence and open questions from the Adriatic Sea
No full textStrong efforts have been done by the scientific community to reconstruct the last marine transgression and describe it through geophysical models that could match with the information observed in the field. However, because of the few available data, the eustatic curve is still affected by important uncertainties for the period before 8 ka BP.
Thanks to its gentle slope, the continental shelf of the Northern Adriatic Sea is one of the very few areas in the Mediterranean that preserves a partial record of the sea-level variations occurred between Late Glacial and Early Holocene. These changes are documented by sediments and landforms formed in lagoon and paralic environments, which are strongly susceptible even to subtle variations of the relative sea level.
We analysed the large dataset of CHIRP-Sonar profiles acquired in the Adriatic since 1990 by CNR-ISMAR during a series of oceanographic missions and the database of stratigraphic cores sampled in the off-shore and along the coastal plains of Northern Italy and Istria.
A major issue is represented by the recognition and characterization of the periods of rapid increase of the sea level, which punctuated the Late Glacial and the first part of Holocene. These phases caused the abrupt submersion of large sectors of the former coast and alluvial plain, inducing dramatic environmental changes.
In the study area, a large barrier-island system, which remnants can be found between -38 and -42 m Mean Sea Level (MSL), formed ca. 11-10 ka BP and was rapidly drowned in place soon after. Furthermore, important information about a sea-level jump occurred around 9.5-9.2 ka BP have been recently documented both in the deltaic plain of the Po River and in the submerged shelf at about -30 m MSL. This phase of transgression allowed to the Adriatic Sea to penetrate into the Gulf of Trieste, strongly transforming the area between Istria and the coast of Friuli. Another important phase of submersion is documented between 8.4-8.2 ka BP, when relative sea level in the area was around -15 m MSL.
In the studied area the reconstruction of the sea-level evolution rises a major question, represented by the uncertainties related to the stratigraphic, geomorphological and environmental indexes which could allow the identification and quantification of sea-level jumps. Moreover, considering the lagoon and coastal environments, the decreases of the rate of the relative sea-level rise documented in the stratigraphic record could be the product of eustatic stillstands or, partly, also of the environmental changes induced by the episodic strong increase of the sedimentary input from the continent and the consequent basinward shifting of the coastline
Environmental changes in the lower Mirna River valley (Istria, Croatia) during Upper Holocene
No full textSedimentological, macro- and micropaleontological analyses on 3 hand augering cores were carried out in the terminal sector of the Mirna River, in order to study the depositional facies and the environmental evolution. The cores allowed investigating the subsoil down to 13 m of depth, sampling a fairly continuous depositional sequence of estuarine, lagoon and alluvial sediments. The Holocene marine transgression entered upstream the present-day coast for at least 8 km, while in the last 7 ka it was followed by the progradation of Mirna delta. The protected coast offered by the lower valley and the strong input of fresh water led to the presence of a brackish microfauna even in front of the river mouth. The oldest sediments in the cores were characterized by dominance of Ammonia beccarii and significant proportions of Elphidium spp. and miliolids suggesting estuarine origin. Foraminiferal assemblage in overlying sediments became less diverse, relative abundance of Elphidium spp. and miliolids dropped, implying shift to transitional environment (inner lagoon facies, Bb). Sediments originating in hyposaline marshes (facies Ba) had the lowest foraminiferal species diversity index (A. beccarii predominated over Trochammina inflata and Haynesina sp.) Since late-Antiquity a significant alluvial matter input led to the deposition of several meters of silty clay sediments that in the core M3 are thicker than 9 m. The sedimentary supply has been partly increased by deforestation carried out in the Mirna catchment area that was particularly severe from the 15th to the 19th century and fed the fluvial system with large amount of material, allowing the fast progradation of the delta. This study highlights the potential role of the use of hand augering in sampling and describing the subsoil in reconstructing the geomorphological evolution of the area and supporting the study of past relative sea levels, climate changes, and anthropogenic activities that occurred during the Holocene
Data and platform co-ops in smart city citizenship: interview with Igor Calzada
No full textIgor Calzada is a senior researcher at universities like Oxford and Cardiff with a focus on urban, regional and technopolitical transformations, considering data issues and social innovation. In November 2020, he launched the book Smart City Citizenship, which proposes another framework at smart cities based on democratic governance and citizenship. Thus, he presents how it is possible to understand and intervene in technopolitical disputes involving algorithms, data, and artificial intelligence based on notions such as digital sovereignty. Among the possibilities, there is the creation of data and platform co-ops based on data and digital commons. For the author, data cooperatives are a subtype of platform cooperatives, in which they focus on business models, while data co-ops share and store data. The book analyzes, among other cases, the Barcelona ecosystem and proposes perspectives for public policies. Currently, Calzada is interested in exploring new models of data governance and artificial intelligence to propose alternative ways to data ecosystems in the European scenario. He defends experimental cities as a reaction to the mainstream idea of the city as a platform, as a reproduction of extractive and panoptic practices through hyperconnectivity. But it will be very difficult in a dangerous context. And he provokes: “how, in the current context, in which we are closed in our homes, can we propose cities with open systems? Other recommendations from the author are an article on platform and data co-ops published in Sustainability journal and a conversation in Spanish about social innovation in smart cities. Read the interview with Igor Calzada: https://digilabour.com.br/2021/01/06/data-and-platform-co-ops-in-smart-city-citizenship-interview-with-igor-calzada
Piano works by Igor Stravinsky
No full textIn my work I thought was right at first a brief outline development work of Igor Stravinsky. I also tried to "map out" the emergence of some major piano works by the author. finally, I added a few notes on the piano interpretive art of Igor Stravinsky
Human adaptation to changing coastal landscapes in the Eastern Adriatic: Evidence from Vela Spila cave, Croatia
No full textIn this paper new palaeogeographic and archaeological data from the prehistoric cave Vela Spila on the island of Korčula in Croatia are combined with new realizations of two glacial isostatic adjustment models in order to present relative sea-level change scenarios confronting the inhabitants of the cave at different time slices and to show how they experienced and adapted to sea-level and climate change from the Late Pleistocene through the Holocene. Our results show that from the Late Upper Palaeolithic until the Mesolithic, humans in the study area would have experienced tens of metres of sea-level rise, at rates in some cases up to 12 mm per year, and, owing to the relatively flat morphology of the now submerged plains, hundreds of meters of horizontal coastline change in the plains to the north and south of the island. This evidence supports the hypothesis that the rapid loss of these plains likely contributed to the human abandonment of the cave after the Palaeolithic for about five thousand years, followed by significant changes in lifestyle and diet in the Mesolithic. Our results have important implications for the study of how past human groups, especially in vulnerable coastal areas, were affected by sea level, climate, and other environmental changes. Vela Spila represents a case study of how changing environment and rising seas can force significant alterations in human societies, even when there is no risk of inundation to settlement sites
Introduzione a Igor Spanò (a cura di) Il Teatro e la festa. Il tempio, la piazza, la scena
No full textPer tre giorni gli studiosi che sono intervenuti al Convegno hanno riflettuto sul senso e sulle funzioni, sulle pratiche cultuali e rituali, sui luoghi che hanno definito nel corso del tempo i momenti della festa e sulle forme di rappresentazione agonistica (danze, corse, gare, giochi di abilità) o drammatica - di cui erano parte essenziale la musica e il canto - che, spesso intrinsecamente, li accompagnano. L'autore nella sua introduzione esamina le sfumature di significato che racchiude il termine utsava, “festa”, “gioia” in sanscrito.For three days the scholars who spoke at the conference reflected on the meaning and functions, on the cult and ritual practices, on the places that have defined the moments of the celebration over time and on the forms of competitive representation (dances, races, competitions, skill games) or dramatic - of which music and singing were an essential part - which, often intrinsically, accompany them. In his introduction, the author examines the nuances of meaning contained in the term utsava, "feast", "joy" in Sanskrit
Sedimentological characteristics of the core from the Jadrtovac salt marsh
No full textPrikupljene su dvije jezgre MSM1 i SM1 na području slane močvare oko Jadrtovca, Morinjski zaljev. Cilj ovog rada bio je analizirati sedimentološke karakteristike jezgri te s obzirom na karakteristike odrediti promjene u jezgri po dubini odnosno kroz vrijeme. Napravljene su analize veličine zrna i mikroskopski pregled uzoraka. Obje jezgre imaju sličnost u dominaciji mulja, s manjim udjelom pijeska i šljunka. Ovakav sastav sedimenta je posljedica trošenja fliša i tla okolnog područja kao i biogene sedimentacije unutar samog zaljeva.Two cores MSM1 and SM1 were collected in the area of the salt marsh around Jadrtovac, Morinje Bay. The aim of this work was to analyse the sedimentological characteristics of the cores and, with regard to the characteristics, to determine the changes in the cores by depth or time. Analysis of grain size and microscopic examination of the samples were made. Both cores have a similarity in the dominance of mud, with a smaller proportion of sand and gravel. This sediment composition is due to the erosion of flysch and soil from the surrounding area, as well as biogenic sedimentation within the bay itself
Characteristics of geomaterials and environmental impact assessment of the Marišćina County Waste Management Center
No full textŽupanijski centar za gospodarenje otpadom „Marišćina“ ključan je dio integralnog sustava gospodarenja otpadom u Primorsko-goranskoj županiji. Temeljni brtveni sustav na odlagališnim plohama izgrađen je po Pravilniku, a sastoji se od temeljnog tla, mineralnog brtvenog sloja, bentonitnog tepiha, HDPE folije te drenažnog sloja. Cilj rada bio je odrediti karakteristike mineralnog brtvenog i drenažnog sloja te u odnosu na okolnu geologiju procijeniti mogući utjecaj na okoliš samog odlagališta. U radu je također opisana obrada procjednih i svih otpadnih voda iz samog centra. Za utvrđivanje granulometrijskih karakteristika geomaterijala korištena je metoda mokrog sijanja i izravnog mjerenja, dok je za mineralni sastav brtvenog sloja napravljena rengenska difrakcija. U okolici odlagališta prikupljeno je 14 uzoraka kako bi se ustvrdile geološke značajke stijena.Marišćina County Waste Management Center is a vital component of the integrated waste management system in Primorje-Gorski Kotar County. The fundamental sealing liner designed of the landfill is constructed according to regulations and consists of the base soil, mineral sealing liner, Geosyntetic Clay Liner (bentonite), HDPE liner, and drainage layer. The aim of the study was to determine the characteristics of the mineral sealing liner and drainage layer and, in relation to the surrounding geology, assess the potential environmental impact of the landfill itself. The study also describes the waste water treatment of leachate from the center. Wet sieving and direct measurement methods were used to determine the granulometric characteristics of the geomaterial, while X-ray diffraction was employed to analyze the mineral composition of the sealing liner. Around the landfill, 14 samples were collected to ascertain the geological features of the rocks
Correlation of foraminifera content and granulometric properties of sediment in different transitional environments along a karstic coast, eastern Adriatic, Croatia
No full textPurpose The aim of this study was to describe the distribution and composition of foraminiferal assemblages and granulometric properties of sediment in transitional environments along the eastern Adriatic coast. Another objective was to compare the results and establish correlations (similarities and differences) between these sensitive environments. Materials and methods Sediments from transitional environments were collected in December 2019 at three geographically separate sites: the Mirna salt marsh, the Soline mud plain, and the Nin intertidal plain. A total of 18 sediment samples (top 2 cm) were collected along the land-sea transect. Micropaleontological and granulometric analyses were performed. Identification of foraminiferal genera and species, absolute and relative abundance, and ecological (biodiversity) indices were determined on standardized samples. Particle size distribution was determined, which allowed classification of the sediment. Carbonate content and organic content analyses were performed as well. Results At the northernmost site, at the Mirna salt marsh, muddy sediments with low species diversity predominate. The Soline mud plain was characterized by greater species diversity and a uniform proportion of sandy and silty components in sediment. At the Nin intertidal plain, sediment was primarily sand with the greatest foraminiferal species diversity compared to the other two sites. The genus Ammonia dominated in all foraminiferal assemblages. Conclusions A different distribution pattern of benthic foraminifera in each environment was associated with variations in the grain size of sediment and was also influenced by the supply of freshwater from the river and karstic springs. Considering the lack of research on the transitional environments of the eastern Adriatic coast, this work provides more detailed data and emphasizes the importance of these environments and their biota
Micropaleontological and sedimentological characteristics of the cores from the Jadrtovac salt marsh (Central Dalmatia)
No full textUnutar ovog rada istraživano je područje slane močvare kod Jadrtovca (srednja Dalmacija) bušenjem četiri sedimentne jezgre duž profila slane močvare. Sediment iz jezgri podijeljen je na intervale, laboratorijski obrađen, određene su mu sedimentološke karakteristike, nakon čega je podvrgnut metodi razgradnje organske tvari pomoću 30%‑tne otopine vodikovog peroksida. Potom je uslijedila detaljna mikropaleontološka analiza pod stereoskopskim mikroskopom. Svi uzorci su pregledani i izdvojena im je foraminiferska zajednica. Foraminifere su određene prema rodu ili vrsti. Sediment je u konačnici klasificiran kao mulj s manjim udjelima pijeska i šljunka. Od foraminiferske zajednice dominiraju bentičke, perforatne foraminifere Opažene planktonske foraminifere uglavnom su pretaložene iz fliškog zaleđa. Objašnjen je nastanak slane močvare i promjene taložnih okoliša te pomoću prisutnosti antropogenog materijala, okvirna starost sedimenta jezgre do jednog metra.In this thesis, the area of the salt marsh near Jadrtovac (Central Dalmatia) was investigated by drilling four sedimentary cores along the profile of the salt marsh. The sediment from the cores was divided into intervals, laboratory processed. Its sedimentological characteristics were determined, after which it was subjected to the method of decomposition of organic matter using a 30% solution of hydrogen peroxide. This was followed by a detailed micropaleontological analysis under a stereoscopic microscope. All samples were examined and their foraminiferal assemblage was isolated. Foraminifera were defined by genus or species. The sediment is ultimately classified as mud with smaller amount of sand and gravel fractions. The foraminiferal assemblage is dominated by benthic and perforated foraminifera. Detected planktonic foraminifera were mainly redeposited from the flysch hinterland. The genesis of the salt marsh and changes in depositional environments alongside the approximate age of the core sediment up to one meter is explained
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