1,720,991 research outputs found
Vulnerabilità costiera, dune e fruizione turistica: conflitti e compatibilità lungo il litorale di Rosolina.
No full textSediment storage in the northern Adriatic ebb-tidal deltas, Italy: sand use potential and GIS database
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Le riserve di sabbia: strategie di impiego di materiali di escavazione dalle vie marittime di accesso lagunare.
No full textSediment storage at tidal inlets in northern Adriatic lagoons: ebb-tidal delta morphodynamics, conservation and sand use strategies.
No full textSeveral morphological and sedimentological investigations were carried out along barrier islands in the northern Adriatic (Italy) in order to evaluate the sand reservoir potential associated with ebb-tidal deltas. The classical exponential AeP (cross-sectional area vs. spring tidal prism) relationship was used to draw a synthesis of the hydrodynamic equilibrium conditions and demonstrates that both natural and artificially fixed
inlets exhibit the same morphological adaptations to tidal conditions. A new semi-automatic geostatistical GIS procedure was developed to process bathymetrical data. With this, a first estimate of ebb-delta volumes, was obtained. Sand storage potential at natural and almost natural inlets varied considerably, as a function of the tidal prism, from ca. 0.27 x 10^6 to ca. 11x10^6 m3. The same procedure, applied to the large jettied inlet of Lido, produced 10% of the expected volume that was calculated with the tidal prism. The immaturity status of the ebb delta was confirmed by the application of a simplified version of the Tidal Inlet Reservoir Model, which takes into account the time delay of sand bypassing inside the inlet system. This study also presents the use of GIS as a tool for cataloguing sediment stored in ebb deltas with the potential application of using this material for nourishment plans aimed at restoring neighbouring beaches which are subject to erosion
A geostatistical procedure for the assessment of sand storage potential at northern Adriatic inlets.
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Inventory and conservation assessment for the management of coastal dunes, Veneto coasts, Italy
No full textManagement of coastal dunes on developed coasts could effectively take advantage of comprehensive and multi temporal georeferenced data collection, which offers the possibility to relate dune data with the natural and cultural characteristics of the beach and hinterland. The recent implementation of a coastal management geodatabase for the Veneto region provides the opportunity for improving knowledge on coastal dunes on developed littoral as well as a basis for appropriate future coastal planning in the study area. The geodatabase gathers data concerning different physical, evolutionary and human aspects of the coastal zone, with a special focus on coastal dunes.
Established foredunes, human-altered dunes and relict dunes are irregularly distributed along 59 km, 38% of the entire coastal length. Their distribution and characteristics are the result of favourable natural conditions as well as long-lasting tourism exploitation (evaluated through an index of Land Use Pressure) and fragmentary and diversified uses of beaches (evaluated through an index of Tourism Pressure on the beach). At the same time, beach/dune nourishment intervention allowed the presence
of artificial or sand fenced dunes along 17 km of coast. High dune elevation up to 8–10 m is promoted by the onshore exposition of the beach to dominant wind (from ENE), by stable-to-slowly negative sedimentary budget or by the re-activation of high relict foredunes in the case of shoreline retreat associated with strong negative budget. Present sedimentary budget (evaluated through the code ASPE – Accretion, Stable, Precarious, Erosive) is the tool used for dividing coasts in sedimentary compartments or cells. Past and present sedimentary budget and different human responses to erosive cases (hard and soft interventions) give the foredunes different means to form, grow, survive and evolve over time. The assessment of human impact and active management practices on the dunes allows a first evaluation of the management effectiveness, which shows strong shortcomings for 81% of the dunes. The great variability of beach usage, human impact and management practises on the different dune stretches highlight the lack of effective and systematic management actions being correctly scheduled and performed
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