1,721,170 research outputs found
Assessment of coastal erosion susceptibility at the national scale: The Italian case
No full textTo improve the present national and local sustainable planning capability for the coastal zone a GI application for the Italian Coastal Susceptibility Assessment was planned within an institutional agreement between ENEA and the Land Defence Service of the Italian Ministry of Environment. Taking into account previous European actions a suitable methodology to assess, in a quantitative way, the susceptibilty of beaches to be eroded has been set up. The methodology balances the coastline trend as evaluated for a defined time period with the present coastal areas morphology and land use, this in order to derive a value that expresses the evolutionary process in terms of probability of the loss of goods within the 'Homogeneous Coastal Tracts'. The trend in the movement of the sea-land line has been used as geo-indicator of a complex dynamic balance that refers both to marine and inland systems, and a vector GI application was built and locally applied in southern Italian coastal areas. The present shoreline position and some other information describing the intrinsic beach morphologies, and having significance for the coastal erosion hazard assessment, have been derived from the national 1:10.000 ortho-images of the National Cartographic Reference System provided by the Italian Ministry of Environment. The illustrated GI application - CoSTAT - keeps the nominal scale of all data collected or produced. In this analysis the coastal dune presence is analysed as factor limiting coastal erosion susceptibility. Applying a matrix calculation a quantitative evaluation of erosion susceptibility degree was achieved and plans were made to develop new information for a suitable use of Italian coastal areas. The work describes the methodology, the conceptual framework and the results of a local application
A review of the Coastal Geomorphology of Karavasta Lagoon (Albania): Short Term Coastal Change and Implications for Coastal Conservation
No full textStudio sulla geomorfologia delle lagune albanes
Magnetic susceptibility of surficial sediments from the Strait of Magellan
No full textMagnetic susceptibility (MS) was measured on the bulk samples (MSmv) and on the following three size fractions: gravel (MSg), sand (MSs) and mud (MSf). There is a direct correlation between MSmv on the one side, and MSg and MSs on the other; the MS of the sand and gravel fractions probably determine the bulk average. Furthermore, MS decreases with increase in mud content of the sediment. The MSmv, MSg and MSs values are independent of the depth of sampling; this is due to the change in texture of the sediments, which is controlled by the complex fluid-dynamics of the currents in the Strait. -from Author
Geomorphology and characterization of the coastal and marine area between Primera and Segunda Angostura, Strait of Magellan, Chile.
No full text"The System Theory" aimed at the determination of a Coastal Instability Index: a case study, the Atlantic side of the Straits of Magellan
No full textStratigrafia dei depositi recenti della Sacca di Goro. In: La Sacca di Goro (U. Simeoni Ed.).
No full textCoastal studies in northern Victoria Land (Antarctica): Holocene beaches of Inexpressible Island, Thetys Bay and Edmonson Point
No full textThe study of a number of coastal areas in the Terra Nova Bay, carried out during austral summer 1987-88, allowed identification of some of the geomorphological and lithological features of the Quaternary raised beaches of Northern Victoria Land (Antarctica). A modern pitted-like beach was studied, the morphogenesis of which is ascribed to floating ice beached by a storm
Geomorphological modeling of tidal inlets for sustainable deltaic lagoon management: A case study from the Po River delta, Italy
No full textRiver deltas and enclosed lagoons represent a zone where fluvial and littoral processes interact through the redistribution, erosion, and deposition of sediment, which have a large impact on coastal management and engineering. The focus of the study is to understand the correct balance between strategies that maintain the navigational efficiency of tidal inlets and those that respect the ecological and economical functions of coastal lagoons. We applied an integrated modeling system that links multiple hydrodynamic and morphodynamic models to understand how coastal processes and associated sediment transport influences the functioning of the southern inlet of the Barbamarco Lagoon in the Po River Delta, Italy. Moreover, our study provides engineering solutions to improve the inlet functioning efficiency and a proposal for a monitoring plan. Our results highlight the importance of the seasonal effects of wave climate on the littoral sediment transport. Model outcomes show that the dredging volume is approximately 15,000 cubic meter/year for the southern inlet, which may vary with wave climate. However, creating a wider seaward tidal channel will reduce dredging activities over a longer interval than would sediment removal. A deeper and wider channel will deflect the along shore current seaward and cause sediment to bypass the inlet. Therefore, the sediment will reach the erosional side of the inlet and enhance the redistribution of the sediment, which may reduce over wash during storms and high-water levels. Our results illustrate the ephemeral equilibrium of tidal inlets and coastal lagoons in deltaic systems impacted by large riverine sediment delivery. Shore management scenarios and decisions rely on hydro-morphodynamic numerical models that predict best practices for coastal sustainability
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