Search results for "erosion"
showing 10 items of 637 documents
Evaluating the effects of man-induced topographic changes in landscape structure on soil erosion by water: a case study in Sicily
2012
The San Leone (Agrigento) dunes: geomorphological environment and managment
2007
tRIBS-Erosion: combining mechanistic approaches for investigating eco-hydro-geomorphic response of river basins to climate change
2011
Vegetation interacts with hydrology, geomorphology and processes of a river basin in profound ways. Despite recent advances in hydrological modeling, the dynamic coupling between these processes is yet to be adequately captured at the basin scale to elucidate key features of process interaction and their role in the organization of vegetation and landscape morphology. In this study, a newly integrated geomorphic component of the physically-based, spatially distributed hydrological model, tRIBS, the TIN-based Real-time Integrated Basin Simulator, is presented. Hillslope and channel erosion processes are parsimoniously coupled with vegetation-hydrology dynamics, making it possible to study ho…
Aspetti geotecnici e marittimi di due interventi di difesa costiera
2022
Two case-histories of the design of submerged breakwaters for coast protection are shortly reported in the paper. The first one refers to the stabilisation and protection works of the sand beach of S.Alessio Siculo village, in Sicily, that suffered severe erosion triggered, some forty years ago, by the construction along the shoreline of a vertical seawall in lieu of the pre-existing sand-dune system. As a consequence, long stretches of the seawall were undermined and collapsed, and the beach almost disappeared. A submerged breakwater was built to reduce the inten-sity of wave attack, the seawall was rebuilt where necessary and provided with a rock revetment at the toe, and then a “perched”…
La Geografia della costa siciliana tra minacce e opportunità. Casi di studio
2017
La presenza della costa ha sempre rappresentato un elemento di attrazione per l’elezione e lo sviluppo di un sito. È noto come le diverse opportunità date dalla presenza del mare - in termini di commercio, trasporto, difesa, risorse alimentari e non solo - abbiano spesso determinato il successo di molti insediamenti. Nel tempo la costa ha smesso di essere considerata semplicemente un confine fisico al processo di urbanizzazione, ma ha guadagnato un ruolo fondamentale nella caratterizzazione del paesaggio di una città o, in generale di un territorio, divenendo lo specchio del grado di sviluppo e di “salute” del territorio medesimo. Le funzioni della costa si sono dunque evolute e il tema del…
Mafia e Antimafia
2005
Le dimissioni degli imprenditori Costanzo e Cascio – seduti nei Consigli di Amministrazione di alcune società con gli eredi di Bontate e Teresi – dalle rispettive cariche di presidente di Confindustria Sicilia e di Confindustria Palermo, tornano a riproporre il problema della chiara identificabilità delle infiltrazioni mafiose all’interno del tessuto economico e produttivo dell’Isola e dell’intero Paese. Si tratta di un problema antico e di difficile soluzione; una questione che nel tempo ha contribuito a inaridire il tessuto imprenditoriale siciliano e che ancora oggi disincentiva gli investimenti e l’intrapresa economica. Il potenziale investitore, infatti, deve confrontarsi con la pervas…
Shoreline Evolution and Environmental Changes at the NW Area of the Gulf of Gela (Sicily, Italy)
2021
Coastal areas are among the most biologically productive, dynamic and valued ecosystems on Earth. They are subject to changes that greatly vary in scale, time and duration and to additional pressures resulting from anthropogenic activities. The aim of this work was to investigate the shoreline evolution and the main environmental changes of the coastal stretch between the towns of Licata and Gela (in the Gulf of Gela, Sicily, Italy). The methodology used in this work included the analysis of: (i) shoreline changes over the long- and medium-term periods (1955–2019 and 1989–2019, respectively), (ii) dune system fragmentation and (iii) the impact of coastal structures (harbours and breakwaters…
Coupling a hydro-maritime model and remotely sensed techniques to assess the shoreline positioning uncertainty: the Marsala coast study case
2010
The severe erosion phenomena affecting the Mediterranean coasts are strictly related to geophysical characteristics and socio-economic pressures. This suggests the need of monitoring and modelling the phenomenon in order to quantify its strength. In fact, the shoreline position, as well as its temporal evolution, provides important information for designing defence structures and for the development of a coastal management plan. The shoreline has a dynamic nature as it changes both in the short and long period. Those changes are caused by geo-morphological (e.g. bars and barrier island development etc.) and hydrodynamic (wave motion, tides and flows) processes, as well as by sudden and fast…
Shortage of Sediments in the Maspalomas Dune Field (Gran Canaria, Canary Islands) Deduced from Analysis of Aerial Photographs, Foraminiferal Content,…
2007
Abstract The Maspalomas dune field and adjacent beaches are the most extensive coastal sedimentary environment on the island of Gran Canaria. This area is very important from both a natural and an economic perspective. The analysis of aerial photographs and satellite images from recent decades does not show important shoreline changes for the El Ingles and Maspalomas beaches, which can be considered, consequently, in a state of equilibrium. However, the Maspalomas dune field presents several modifications, such as aeolian corridors associated with beach kiosks, a significant reduction in thickness of the aeolian deposits, and an increase of deflation areas in the underlying substratum. All …
Coastal erosion in the archaeological area of Selinunte
2010
Coast erosion is a widespread phenomenon and is a considerable issue for the dwellers of coastal areas today. Our study is based on the archaeological area of Selinunte in which we have noticed a process of erosion in progress. In this area we have considered a particular portion of the coast, around 8 km long, since our purpose is the individuation of anthropic elements such as ports, and natural elements, such as rivers. In this area we have set some point of reference using historical and recent cartography in a 1:25.000 scale dating back to 1971, a regional technical paper in a 1: 10.000 scale from 1994, and aerial pictures from 2000 and 2008, all of which we have geo-related starting f…