Search results for "Fluvial"
showing 10 items of 138 documents
Les passages à gué de la Grande Saône, approche archéologique et historique d'un espace fluvial (de Verdun-sur-le-Doubs à Lyon).
2002
National audience
Boulleret, Cher et Cosne-Cours-sur-Loire, Nièvre, ponts sur la Loire
2008
Sedimentation in the Kandi extensional basin (Benin and Niger): fluvial and marine deposits related to the Late Ordovician deglaciation in West Africa
2003
Abstract The Lower Paleozoic detrital succession of the half-graben Kandi Basin in West Africa (Niger-Benin) is about 600 m thick and rests unconformably on the Pan-African basement. Along the western edge of the basin, the base of the succession locally features large glacial fault-bounded paleovalleys. These valleys are filled by the lowermost continental deposits of the Were Formation characterized by massive diamictites with dropstones, and coarse to conglomeratic sandstones associated with large-scale channel structures and internal erosional truncations. The uppermost braided-river deposits of the Were Formation deposited across the entire basin are overlain by the Late Ordovician–Ear…
“Nuove strategie per l’identità territoriale: verso l’istituzione del Parco Fluviale urbano dell’Oreto a Palermo”
2005
New Strategies for Local Identity: Towards the Oreto River Park in Palermo. With regards to the Oreto river park in Palermo, the Council of Palermo, the near Council of Altofonte and the Council of Monreale activated in 2004 a project for environmental regeneration. This project is focused on a Life Environment program named “Sun & Wind”. In this context, a research group of the University of Palermo, in collaboration with the three city councils, studied ecological, natural and cultural resources in order to improve the quality of life of inhabitants and tourists. According to the strategical planning framework, the masterplan of Palermo is integrated with the ones of Altofonte and Monreal…
Palaeoecological response to Greenlandian (Early Holocene) climatic changes: Insight from an abandoned-channel sequence of the Meuse River at Autreco…
2020
Abstract A Greenlandian (Early Holocene) palaeochannel of the Meuse River is described from Autrecourt-et-Pourron in the Ardennes region of northern France. During the Younger Dryas, fluvial deposits represent a high-energy, sinuous palaeochannel, but at the onset of the Holocene, progressive channel abandonment resulted in the establishment of a low-energy meandering river system. Well-dated studies using palynology, carpology, malacology and geomorphology reveal a Greenlandian succession of changes in fluvial dynamics and vegetation. Between 11,700 and 11,400 cal yr BP, warmer temperatures led to the development of a birch community (Betula sp.) within an open grassland, dominated by herb…
Mineralogical and chemical variability of fluvial sediments 2. Suspended-load silt (Ganga–Brahmaputra, Bangladesh)
2011
Sediments carried in suspension represent a fundamental part of fluvial transport. Nonetheless, largely because of technical problems, they have been hitherto widely neglected in provenance studies. In order to determine with maximum possible precision the mineralogy of suspended load collected in vertical profiles from water surface to channel bottom of Rivers Ganga and Brahmaputra, we combined Raman spectroscopy with traditional heavy-mineral and X-ray diffraction analyses, carried out separately on low-density and dense fractions of all significant size classes in each sample (multiple-window approach). Suspended load resulted to be a ternary mixture of dominant silt enriched in phyllosi…
Cyclicity of Triassic to Lower Jurassic continental red beds of the Argana Valley, Morocco: implications for palaeoclimate and basin evolution
2000
Abstract Cyclical playa deposits form a prominent part of the continental clastic succession of the Argana Valley, Western High Atlas of Morocco. The red beds formed in Triassic to Lower Jurassic times during rifting of the North American and African plates. Detailed stratigraphic work revealed asymmetrical, metre-scale cycles in mudstone-dominated successions that constitute the intermediate and upper portion of the basin fill. Sedimentary cycles commonly comprise ephemeral lake shales at the base, playa mudflat mudstones in the intermediate part, and both fluvial and aeolian sandstones at the top. Cycles of the Aglegal Member (T4) are mainly characterized by analcime-rich playa mudflat de…
Effects of hydrological events on morphological evolution of a fluvial system
2018
Abstract This study quantifies morphological evolution of the Dez River, Iran, from 1955 to 2016. The approach uses a sequence of Landsat images, aerial photos, and topographic maps. In addition, the hydrological data including average daily discharge and yearly maximum discharge at the Dezful hydrological station for the period (1955–2016) were used. The study reach was divided into 48 meander loops from upstream to downstream. Active channel width (w) was determined at 10 m intervals and changes assessed along the study reach of the Dez River. Morphological indices including sinuosity index; straight meander length; centerline flow length; erosion area; erodible length channel migration; …
L'anima dell'Oreto rifiutata, sognata, cantata.
2007
La città di Palermo ha davvero voltato le spalle all’Oreto? Molti abitanti di Palermo considerano il fiume Oreto come un canale di scarico, altri una potenzialità per la realizzazione di un parco fluviale. I bambini dei quartieri vicini lo sperimentano come spazio di avventura. Il modulo di recupero e riqualificazione del Laboratorio di Urbanistica mira ad attivare un processo comunicativo attraverso l’ascolto attivo, l’osservazione e la redazione di reportage al fine di cogliere gli aspetti vitali che legano il fiume alla città e restituire una nuova visione della valle fluviale rispondente ai desideri degli abitanti, esclusi o inclusi dal suo uso, in modo da trasformare questa realtà nega…