Search results for "Ephemera"
showing 8 items of 68 documents
Testing GIS-morphometric analysis of some Sicilian badlands
2014
Abstract Calanchi badlands are erosion landforms characterized by areas with scarce or absent vegetation, steep slopes, knife-edge divides and high erosion rates. They are originated by a combination of morphogenetic processes, partly similar to those shaping bigger fluvial landforms, and therefore can be considered as field “laboratories.” This paper presents the results of an investigation carried out in two badland sites located in Sicily, where the geometry of 25 calanchi has been characterized using Digital Elevation Models having a mesh size equal to 2 m. For each landform, a power length–volume relationship is established. This relationship demonstrates that length of calanchi channe…
Fan Deltas and Floodplains in Valencian Coastal Plains
2018
The Valencian coastal plains are formed at the end of two important mountain systems: the Iberian Mountain Range to the north and the Baetic Mountains to the south. As a result of tectonic and neotectonic activity, several graben have been formed at the foot of these reliefs, which have been filled with Plio-Quaternary deposits. In all the coastal plains a depositional sequence is repeated in which the river deposits -fan deltas and alluvial plains- alternate with lagoons/marshes. Basin dimensions, sediment input, tectonics and neotectonics in the study area all determine the size, style and characteristics of fluvial forms, which in turn, influence the characteristics of the coast. Ephemer…
Palaeoecology of non marine algae and stromatolites: Permian of France and adjacent countries
1999
Abstract Some Permian, continental basins from Algeria, Morocco, France, Italy, Germany and Poland reveal algal remains and stromatolites, mainly during Lower Permian, but also during Middle and Upper Permian. The algae belong to 8 morphogenera and 12 morphospecies. Two species are new. The taxonomic attributions are difficult, even if some species resemble living species. The algae make unorganized masses, or laminated builtups (stromatolites, oncolites, oolites). Algal masses and stromatolites are contained in fluviatile sediments (active or abandoned channels) and lacustrine deposits (playas, ephemeral lakes shorelines, lakes several meters or decameters deep). Considering the sedimentol…
A new approach for assessing minimum flow in ephemeral streams
2009
The aim of this paper is to propose a new methodological approach, appropriate for low-yielding catchments, by calculating the ecological minimum river flow starting from the river water quality based on biological indicators and physical–chemical characteristics as reported in the Italian Water Law no. 152/06 and in the UE 2000/60 Directive (WFD: Water Framework Directive). Actually, protecting and restoring river flow regimes and hence the ecosystems they support by providing environmental flows, has become a major aspect of river basin management. In detail, pollutant concentrations downstream and fluvial structure cross-sections have been evaluated, starting from discharges released dow…
Les apports des parcours commentés
2013
Understanding space in ephemeral organizations: contributions of commented walksThis article examines a particular type of ephemeral organization in which institutional and secular actors are connected resting upon on a strong territorial basis. Their fleeting quality is however compatible with a certain degree of permanency. The authors question the sources and resources of such permanency and insist on the role of space in coordinating collective action, and in this case, in preventing urban incivilities. They call on an unusual method, called Commented Walks, to capture the relation between such organizations and space.
Comparison between a detailed and a simplified integrated model for the assessment of urban drainage environmental impact on an ephemeral river
2008
The benefit of integrated analysis has been demonstrated in technical literature and it is also required by the EU Water Framework Directive 60/2000, which proposes a water-quality-orientated view of the whole urban drainage system and oversees new ways of assessing its performance. Integrated models, such as any complex modelling approach, often have prohibitive data availability requirements that reduce their applicability. Moreover, widely different approaches can be applied, ranging from simple conceptual models to complex physically based ones. In the present paper, two approaches have been compared using data from an experimental catchment in Bologna ( Italy), which consists of a part…
La buona morte di Filippo iv e la proclamazione del suo successore. Un modello di comunicazione in età barocca
2021
Nella prima età moderna, l’importanza attribuita dalla società del tempo al rituale funebre ha portato l’attenzione degli studiosi sulle pratiche funerarie e sugli apparati effimeri commissionati agli artisti di corte, con il susseguirsi di numerosi studi che hanno analizzato il fenomeno sotto vari punti di vista, trovando spesso una contestualizzazione territoriale della produzione effimera, esaminando scrupolosamente le cerimonie funebri della monarchia spagnola: Il trattamento dei corpi, imbalsamazione, l’abito dei monarchi, il tipo di sepoltura, il corteo funebre, le cappelle ardenti o i modi di mostrare il dolore. Un impegno comune inizia ad apparire dalla serie di belle morti, che acc…
“Ephemeral” regeneration for the marginal urban spaces/places in Enna
2020
The aim of this paper it to demonstrate that the interventions of “ephemeral designing” - seen in the key of potential activators of shared forms of bottom-up urban regeneration - may be also read as sequence of pop-up actions (flames); but capable in conferring to the marginal urban spaces - even if temporarily - a “meta-real” shape of the desirable effects of that urban transformation they would to reach in a real implementation. By establishing, thereby, with both the city's communities and places, a true moment of local awareness and animation, fleeting but realistic, that can trigger interest and re-generate the sleeping collective activism, even before to regenerate the physical compo…