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Geomorfologia delle valli del Rio delle Pozze e del Torrente Motte (Abetone, Appennino Tosco-Emiliano).
No full textAn accurate knowledge of present and past geomorphological processes in an area of the Tuscan-Emilian Apennines near Abetone was achieved in this study, also by elaborating a geomorphological map at a 1:10,000 scale. In this territory, prevalently characterised by arenaceous rock types and, secondarily, by argillaceous and silty ones, the landforms listed below were recognised.- Structural landforms: the most evident are located near the mountain crest, where the slope face corresponds to the stratum surface of the Macigno Sandstones and where there are structural scarps more than 30 m high.- Glacial landforms and deposits: they include cirques, overdeepened hollows, roches moutonnées and moraine ridges.- Cryogenic and nivation landforms and deposits: among these, block fields, nivation hollows, avalanche tracks and cones, protalus ramparts, block streams and gelifluction deposits should be mentioned.- Gravity-induced slope landforms and processes: besides the presence of particularly developed scree slopes, various types of mass movements have been recognised, such as earthflows, falls and topples, translational slides, rotational and roto-translational slides, as well as deep-seated gravitational slope deformations (Dgsd), the latter characterised by a dominant structural control (NW-SE and SW-NE oriented faults).- Landforms, processes and deposits due to running waters: slopes affected by rill wash, colluvial and alluvial fans, related to concentrated running waters, are present together with swampy deposits filling small structural depressions; moreover, two orders of alluvial terraces, badland forms, debris flows and small waterfalls have been surveyed. Since the hydrographic network is in a deepening stage, present alluvial deposits are found only upstream of the numerous wiers that dam the courses of the Pozze and Motte torrents.- Anthropogenetic landforms and deposits: among Man's activities which modify the landscape, the construction of large parking areas and ski pistes should be mentioned; these kinds of activities have produced slope cuts and filling of some small swampy areas.The data acquired allowed geomorphological events to be reconstructed starting from late Upper Pleistocene. In particular, in this sector of the Northern Apennines glacial traces ascribable only to the glaciation known in the Alps as Würm III were found. An attempt to reconstruct a relative chronology of the stadial phases was also carried out, thus identifying forms related to Apennines Stage I, which was characterised by two distinct stages with snow limits respectively of 1,611 and 1,663 m a.s.l., and Apennines Stage II, also characterised by two phases with a snow limit ranging between 1,770 and 1,836 m. Apennines Stage III did not leave any trace since, according to the previous authors, its permanent snow limit would be found at heights superior to those of the Apennine peaks of this area.In general, the action of the various morphogenetic agents in the evolutive history of these valleys was strictly conditioned by the structural characteristics of the area
Relazione sull’attività svolta dal Gruppo di Geologia Applicata del Dipartimento di Scienze della Terra dell’Università di Pisa nell’ambito della convenzione stipulata con l’Amministrazione Provinciale di Lucca per lo studio idrogeologico della Piana di Lucca
No full textPremessa
L’acquifero contenuto nei sedimenti ciottoloso-ghiaiosi della Piana di Lucca costituisce certamente uno dei serbatoi di acqua sotterranea più importanti e strategici della intera Provincia di Lucca, sia per le sue caratteristiche idrogeologiche, sia per le abbondanti riserve idriche in esso contenute. Per questi motivi, tale acquifero è da tempo oggetto di cospicui emungimenti, per scopi idropotabili, industriali ed irrigui. Ciò ha determinato nel tempo una consistente depressione del livello piezometrico della falda, specialmente nelle aree di insediamento dei campi-pozzi (particolarmente delicate risultano le zone dei campi-pozzi delle Cerbaie, del Pollino e di Filettole, da cui vengono estratti ingenti quantitativi di acqua per uso idropotabile). Molto significativo, in tal senso, risulta il grafico riportato in fig. 1, elaborato dall’Autorità di Bacino del Serchio, in cui si può apprezzare l’entità dell’abbassamento piezometrico tra il 1971 e il 2002 lungo una sezione NW-SE della Piana di Lucca.
Problemi legati al sovrasfruttamento della risorsa idrica si manifestano allorché non si dispongono delle conoscenze adeguate degli acquiferi, delle loro caratteristiche idrogeologiche (soprattutto in termini di immagazzinamento e trasmissività) e delle loro disponibilità idriche, legate alla ricarica. Tra l’altro, per la sua conformazione geografico-politica, la piana di Lucca-Bientina, nel cui sottosuolo risiede l’acquifero in oggetto, coinvolge diversi enti preposti alla gestione e regolamentazione dell’uso della risorsa idrica, tra cui le Province di Lucca e Pisa, l’Autorità di Bacino del Fiume Serchio, l’Autorità di Bacino del Fiume Arno e i consorzi di bonifica.
Al fine di disporre di un piano di gestione condiviso della risorsa idrica, volto quindi alla pianificazione sostenibile dello sfruttamento, l’Amministrazione Provinciale di Lucca, ente competente per la redazione del Piano di Regolazione Usi Acque Superficiali e Sotterranee, dopo aver approvato in data 8 settembre 2009 un Protocollo di Intesa con le Autorità di Bacino dei fiumi Arno e Serchio, ha promosso uno studio finalizzato ad ottenere un modello idrogeologico numerico dell’acquifero della Piana di Lucca. A tale scopo, l’ente, con Determinazione Dirigenziale n. 417 del 03/11/2009 ha incaricato il Dipartimento di Scienze della Terra dell’Università di Pisa e la Scuola Superiore S. Anna di Pisa di realizzare rispettivamente il modello geologico-idrogeologico concettuale di sottosuolo e il modello numerico dell’acquifero. Il primo è lo strumento fondamentale per impostare e calibrare il modello numerico, mentre quest’ultimo costituisce lo strumento gestionale della risorsa, in grado di fornire bilanci idrogeologici e scenari previsionali.
Di seguito, viene sinteticamente esposto il lavoro svolto dal Dipartimento di Scienze della Terra per quanto attiene alla parte di competenza e i risultati conseguiti
Stratigraphy of the Caporalino-Sant'angelo Unit: A fake Jurassic-Eocene succession of the "Alpine" Corsica
No full textThis paper aims to provide new insights on the Caporalino-Sant’Angelo Unit
outcropping north of Corte, in the Caporalino-Omessa area (NE Corsica). It belongs to the
stack of the units from the “Alpine” Corsica, which overlies the “Hercynian” Corsica
basement and its sedimentary cover. Based on a geological mapping, a refined
lithostratigraphy and new datings, the Caporalino-Sant’Angelo Unit is a fake Middle Jurassic-
Middle Eocene succession, sedimented on the European continental margin, because it is a
Middle Eocene clastic wedge, accumulated in a synorogenic compressive basin located
between the European distal continental margin and the deforming “Corsican” accretionary
wedge. This basin received the siliciclastic sedimentary input from the “Hercynian” Corsica
basement, and the carbonatic input derived from the sedimentary cover of tectonic units,
subsequently involved into the complex “Corsican” accretionary wedge
Gravitational slope deformations near the Abetone Pass (Tuscan-Emilian Apennines)
No full textIn this paper some Deep-seated Gravitational Slope Deformations (Dgsd), identified in the Rio delle Pozze valley near the Abetone Pass, are for the first time described. These deformations are developed in competent rock types (sandstones layers with argillite intercalations belonging to the Macigno Formation) and are characterised by a dominant structural control (NW-SE and SW-NE oriented faults). From the geomorphological viewpoint they show double ridges, trenches, concavities and reverse slopes. The Dgsd typologies correspond to rock flows (Sackungen). On the eastern slope of Monte Gomito (located in the adjacent Torrente Motte valley) the same geomorphological features shown by the Rio delle Pozze valley Dgsd have been surveyed. These landforms, which were analysed with respect to the structural characteristics of the zone, are here considered as the surface expression of an incipient rock slide. It is therefore an example of 'geomorphological convergence' within the framework of slope gravitational processes
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Applicazione del metodo del sondaggio dipolare profondo lungo una sezione dalle Alpi Apuane all'Appennino Pistoiese
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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