Investigation of the effects of offshore breakwater parameters on sediment accumulation

Birben, Ali Remzi; Özölçer, İsmail Hakkı; Karasu, Servet; Kömürcü, Murat İhsan

doi:10.1016/j.oceaneng.2005.12.006

Cited by 32 publications

(10 citation statements)

References 9 publications

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“…Between 1988 and 1996, the accretion continued, especially from the fourth breakwater where the salient observed in 1988 was transformed into a tombolo, while those already created have proliferated. The application of the empirical formulas of Seiji et al (1987) and Birben et al (2007) in the study area shows that the tombolos' areas are related to the detached breakwaters' characteristics (length, distance to the coast, spacing).…”

Section: Discussionmentioning

confidence: 99%

“…Large tombolos (Group 1) are developed behind longdetached breakwaters, installed near to the coastline and closely spaced from each other; whereas, small tombolos or Birben et al (2007) Condition of tombolos formation in the case of successive breakwaters: X B =ððL Bn þ L Bnþ1 Þ þ E B Þ between 0.2 and 0.4 X B =ððL Bn þ L Bnþ1 Þ þ E B Þ0:8; n is the breakwaters numbers (n≥1) salients (Group 2) are developed behind short breakwaters, installed far from the coastline and are more spaced from each other.…”

Section: Discussionmentioning

confidence: 99%

“…The studies of Suh and Dalrymple (1987), Ahrens and Cox (1990), McCormick (1993) and especially to the results of Seiji et al (1987) and Birben et al (2007) (which typify the Hammam-Lif coastal setting) suggest that the main controls on the formation and the development of salients and tombolos behind successive breakwaters are the lengths of these structures (L B , Table 4), the distances to the coast (X B , Table 4) and the spacing between them (E B , Table 4). …”

Section: Relationship Between the Coastline Evolution And The Breakwamentioning

confidence: 94%

See 2 more Smart Citations

Detached breakwaters’ effects on a microtidal Mediterranean Coast, case of the Hammam-Lif littoral (North-East of Tunisia)

Saïdi

Souissi²,

Zargouni

2010

J Coast Conserv

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The Hammam Lif shoreline, which is part of the Gulf of Tunis (North-East of Tunisia), suffered from a dramatic erosion event during a storm in 1981. Therefore, eight successive and detached breakwaters were built to protect it. The effect of these protection works on the evolution of this coastline is assessed using aerial photographs geo-referenced by digital photogrammetric methods. Results show that a general accretion has developed behind the detached breakwaters, with the formation of seven tombolos and one salient. The response of the coastline depends on the characteristics of the protective works (length, distance to coast, and spacing). Detached breakwaters which are short, far from the coastline and distant from each other, give rise to very small tombolos or salients. On the other hand, longer breakwaters which are near the coastline and closely spaced, give rise to more developed tombolos, showing that these structures are the most efficient.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Relationship Between the Coastline Evolution And The Breakwamentioning

confidence: 94%

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Detached breakwaters’ effects on a microtidal Mediterranean Coast, case of the Hammam-Lif littoral (North-East of Tunisia)

Saïdi

Souissi²,

Zargouni

2010

J Coast Conserv

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“…At the same time, incident waves impose force on the mangrove degradation areas from a Southwest direction at approximately 230 • to 250 • (magnetic) to the Northeast direction, with the significant wave heights between 0.10 and 0.21 m. In addition, the simulation results also show that the current velocity and wave heights were reduced in the nearshore area, before reaching the study site, due to the resistance forces of the cohesive sediment. Previous studies have reported that cohesive bed slopes have higher friction coefficients compared to sandy beach slopes [30,31]. Therefore, current and wave turbulent energies are reduced on cohesive coastal bed slopes.…”

Section: Sediment and Water Samples Analysesmentioning

confidence: 98%

“…The sloping bottom of the nearshore acts like a natural defence and protects the shore against waves, currents and storms [30,31] by dissipating the wave energy through wave breaking phenomena and depending on bottom friction coefficient [32]. The breaking wave may re-form and break again several times before finally rushing up the foreshore areas in the swash zone.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Sediment Transport and Erosion-Deposition Patterns in the Locality of a Detached Low-Crested Breakwater on a Cohesive Coast

Fitri

Hashim

Abolfathi

et al. 2019

Water

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Understanding the dynamics of sediment transport and erosion-deposition patterns in the locality of a coastal structure is vital to evaluating the performance of coastal structures and predicting the changes in coastal dynamics caused by a specific structure. The nearshore hydro-morphodynamic responses to coastal structures vary widely, as these responses are complex functions with numerous parameters, including structural design, sediment and wave dynamics, angle of approach, slope of the coast and the materials making up the beach and structures. This study investigated the sediment transport and erosion-deposition patterns in the locality of a detached low-crested breakwater protecting the cohesive shore of Carey Island, Malaysia. The data used for this study were collected from field measurements and secondary sources from 2014 to 2015. Sea-bed elevations were monitored every two months starting from December 2014 to October 2015, in order to quantify the sea-bed changes and investigate the erosion-deposition patterns of the cohesive sediment due to the existence of the breakwater. In addition, numerical modelling was also performed to understand the impacts of the breakwater on the nearshore hydrodynamics and investigate the dynamics of fine sediment transport around the breakwater structure. A coupled two-dimensional hydrodynamics-sediment transport model based on Reynolds averaged Navier-Stokes (RANS) equations and cell-centered finite volume method with flexible meshing approach was adopted for this study. Analysis of the results showed that the detached breakwater reduced both current speed and wave height behind the structure by an average of 0.12 m/s and 0.1 m, respectively. Also, the breakwater made it possible for trapped suspended sediment to settle in a sheltered area by approximately 8 cm in height near to the first main segment of the breakwater, from 1 year after its construction. The numerical results were in line with the field measurements, where sediment accumulations were concentrated in the landward area behind the breakwater. In particular, sediment accumulations were concentrated along the main segments of the breakwater structure during the Northeast (NE) season, while concentration near the first main segment of the breakwater were recorded during the Southwest (SW) season. The assessment illustrated that the depositional patterns were influenced strongly by the variations in seasonal hydrodynamic conditions, sediment type, sediment supply and the structural design. Detached breakwaters are rarely considered for cohesive shores; hence, this study provides new, significant benefits for engineers, scientists and coastal management authorities with regard to seasonal dynamic changes affected by a detached breakwater and its performance on a cohesive coast.

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Environmental impacts of single and successive breakwaters along the Mediterranean coastline at Radès–Ezzahra, NE Tunisia

Saïdi

Souissi²,

Zargouni

2012

Bull Eng Geol Environ

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Investigation of the effects of offshore breakwater parameters on sediment accumulation

Cited by 32 publications

References 9 publications

Detached breakwaters’ effects on a microtidal Mediterranean Coast, case of the Hammam-Lif littoral (North-East of Tunisia)

Detached breakwaters’ effects on a microtidal Mediterranean Coast, case of the Hammam-Lif littoral (North-East of Tunisia)

Dynamics of Sediment Transport and Erosion-Deposition Patterns in the Locality of a Detached Low-Crested Breakwater on a Cohesive Coast

Environmental impacts of single and successive breakwaters along the Mediterranean coastline at Radès–Ezzahra, NE Tunisia

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