1,721,006 research outputs found
Foredune growth and implication for beach morphodynamic stages and wind regime variation.
No full textMorphological and sedimentological monitoring of a man-induced accretionary beach-dune system (Ca’ Roman, Venice, Italy).
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Characteristics of coastal dune topography and vegetation in environments recently modified using beach fill and vegetation plantings, Veneto, Italy.
No full textHuman actions can contribute to degradation of coastal environments or they can increase the likelihood that these environments will be restored. Beach nourishment provides a basis for restoration, but ways must be found to add habitat improvement to projects designed for shore protection. This study examines how beach nourishment projects can help reinstate dune landscapes in locations where beaches and dunes had been replaced by static shore protection structures. Dune topography and vegetation on three nourished sites on the northern Adriatic Coast of Italy are compared to a reference site to evaluate changes after beach fill was emplaced. Results reveal how nourishment projects used for shore protection can restore the space available for dunes to form, increase the likelihood of sediment transfers inland and increase the diversity of topography and vegetation. Beach raking prevents formation and growth of hummocky, incipient backshore dunes that would otherwise evolve into a naturally functioning foredune. Sand-trapping fences can speed the process of foredune development but can be counterproductive if they interfere with transport to beach grass (Ammophila littoralis) planted landward of them. Shore protection structures can provide stability and more time for dune evolution on eroding shores, resulting in greater species richness and longer retention of ecological niches. These structures need not be required if re-nourishment occurs frequently enough to provide a beach wide enough to protect against storm wave uprush
Sediment storage in the northern Adriatic ebb-tidal deltas, Italy: sand use potential and GIS database
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
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