The Morphological Response of Beaches Protected by Different Breakwater Configurations

Lorenzoni, Carlo; Postacchini, Matteo; Mancinelli, Alessandro; Brocchini, Maurizio

doi:10.9753/icce.v33.sediment.52

Cited by 11 publications

(17 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is also confirmed by the experimental findings of Lorenzoni et al (2012), in which wave spectra propagating over the same breakwater, but characterized by similar periods and very different heights, induced similar retreats.…”

Section: Discussionsupporting

confidence: 86%

“…Further details on the flume experiment can be found in Lorenzoni et al (2012) and Postacchini et al (2011).…”

Section: The Numerical Validationsmentioning

confidence: 99%

“…The first mainly propagated along the ENE direction, the second along the ESE direction, and the third along the NNE direction. The deepwater significant wave heights (H s0 ) and peak periods (T p0 ) have been extrapolated from different time windows of each storm (see also Lorenzoni et al, 2012). Using those wave characteristics, a JONSWAP (Joint North Sea Wave Project) spectrum was transferred from the deep waters to a depth of 4 m by using the method described by Scarsi (1995), which led to the spectral characteristics H s " H s0 and T p ¼ T p0 , as summarized in Table 2.…”

Section: The Numerical Testsmentioning

confidence: 99%

“…The study further explores some dynamics already analyzed by Postacchini et al (2011), and was inspired by a series of movable-bed experiments carried out between 2008 and 2010 at the Hydraulics Laboratory of the Università Politecnica delle Marche (Ancona, Italy), whose aim was evaluating the effectiveness of different types of rubble-mound breakwaters in reducing shoreline retreat after sea storms. More details on the laboratory experiments are given in Lorenzoni et al (2012).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Assessing the Hydro-Morphodynamic Response of a Beach Protected by Detached, Impermeable, Submerged Breakwaters: A Numerical Approach

Postacchini

Russo

Carniel

et al. 2016

Journal of Coastal Research

View full text Add to dashboard Cite

Postacchini, M.; Russo, A.; Carniel, S., and Brocchini, M., 0000. Assessing the hydro-morphodynamic response of a beach protected by detached, impermeable, submerged breakwaters: A numerical approach. Journal of Coastal Research, 00(0), 000-000. Coconut Creek (Florida), ISSN 0749-0208.Coastal areas host a large fraction of the world's population and are exposed to natural extreme events, which are a serious threat to human life, as well as to economies. For this reason, sea storms are increasingly the object of studies, and the design of traditional coastal defenses is being carried out in conjunction with modeling analyses. Relying on numerical simulations performed by means of an innovative shallow-water hydro-morphodynamic model, the present work explores the overall response of a protected beach to sea storms. Numerical tests evaluate the effects of sea states extracted from realistic sea storms having different spectral characteristics, as well as the influence on beach morphology of positioning shore-parallel, impermeable, submerged breakwaters. Simulation results revealed that, while erosion/ accretion patterns depend weakly on the different sea state conditions, the morphodynamics induced around the barriers is strongly influenced by the breakwaters' positioning. More specifically, at least for the forcing here analyzed, bed variations were shown to increase when the structures are progressively located offshore; on the other hand, the swash zone morphology seems to be only weakly influenced by the positioning of the breakwaters. We also observed that for an increasing extension of the volume over which dissipative breaking mechanisms occur, a decreasing inshore erosion is accompanied by an equally fast decrease of offshore erosion. Analysis of the vorticity fields shows that breakwaters placed far from the shoreline induce an evolution of the vortices generated by breaking waves rather different from the one due to breakwaters placed closer to the shoreline (which can induce seaward flows through the gap, like rip currents). ADDITIONAL INDEX WORDS:Coastal structures, numerical model, nonlinear shallow water equations, sea storm, beach morphodynamics.

show abstract

Section: Discussionsupporting

confidence: 86%

“…Further details on the flume experiment can be found in Lorenzoni et al (2012) and Postacchini et al (2011).…”

Section: The Numerical Validationsmentioning

confidence: 99%

Section: The Numerical Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessing the Hydro-Morphodynamic Response of a Beach Protected by Detached, Impermeable, Submerged Breakwaters: A Numerical Approach

Postacchini

Russo

Carniel

et al. 2016

Journal of Coastal Research

View full text Add to dashboard Cite

show abstract

“…Desde esa época se han llevado a cabo actuaciones ingenieriles de regeneración de playas siguiendo este concepto (Sivard, 1971;Douglass y Weggel, 1987;Ferrante et al 1992;Lamberti y Mancinelli, 1996;Dean et al, 1997;Stauble y Tagar, 2003;, así como ensayos de laboratorio en modelos a escala reducida (Chatham, 1972;Sorensen y Beil, 1988;Chiaia et al, 1992;Groenewoud et al, 1996;CEDEX, 2000;Moreno, 2003;Lorenzoni et al, 2009Lorenzoni et al, , 2012.…”

Section: El Concepto De "Playa Sustentada"unclassified

Perfil de playas sustentadas : estudio hidrodinámico y experimental : directrices de diseño

Blasco¹,

Juan²

View full text Add to dashboard Cite

Experimental study of the short-term efficiency of different breakwater configurations on beach protection

Lorenzoni

Postacchini

Brocchini

et al. 2016

J. Ocean Eng. Mar. Energy

Self Cite

View full text Add to dashboard Cite

A campaign of experimental tests on a 2D movable-bed physical model, reproducing an Italian beach on the Adriatic Sea, has been performed in the wave flume of the "Laboratorio di Idraulica e Costruzioni Marittime" of the Università Politecnica delle Marche (Ancona, Italy), with the aim to assess the fundamental features of various breakwater configurations to be used in a beach-defence system typical of sandy, low-coastline beaches. Three emerged and three submerged configurations of rubble-mound detached breakwaters, for beach protection, placed at different distances from the shore, were tested, as well as a free beach configuration. The short-term hydrodynamic performances of the different configurations were assessed using as forcing some typical real-life intense sea-storm conditions. Wave transmission and beach protection efficiency under various intense wave conditions were obtained and related to some dimensionless parameters, amongst which a recently introduced one, χ , that combines both wave and breakwater properties. Transmission coefficients were found to be about 0.4 for emerged breakwaters and in the range 0.5-0.8 for submerged breakwaters. A net damping coefficient, defined as the wave height decay solely due to the effect of the breakwater, was measured as 0.2 for submerged breakwaters and 0.4 for the emerged ones. Further, submerged breakwaters induce an inshore mean water superelevation that increases with χ ,

show abstract

The Morphological Response of Beaches Protected by Different Breakwater Configurations

Cited by 11 publications

References 10 publications

Assessing the Hydro-Morphodynamic Response of a Beach Protected by Detached, Impermeable, Submerged Breakwaters: A Numerical Approach

Assessing the Hydro-Morphodynamic Response of a Beach Protected by Detached, Impermeable, Submerged Breakwaters: A Numerical Approach

Perfil de playas sustentadas : estudio hidrodinámico y experimental : directrices de diseño

Experimental study of the short-term efficiency of different breakwater configurations on beach protection

Contact Info

Product

Resources

About