Performance of submerged nearshore sand-filled geosystems for coastal protection

Neves, Luciana das; Moreira, Andreia; Taveira-Pinto, Francisco; Lopes, Maria de Lurdes; Gomes, Fernando Veloso

doi:10.1016/j.coastaleng.2014.10.005

Cited by 13 publications

(8 citation statements)

References 21 publications

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“…This beach system includes a natural rocky bank V-shaped in its plan ( Figure 1B-D), which is formed through a geological process [32]. Its geometric shape is similar to that found in previous studies about multifunctional submerged coastal engineering projects [15,[18][19][20]23,33]. Figure 1B shows the submerged structure's dimension (63-m base; 40-m width crest) and distance from the shoreline reference (130 m).…”

Section: Study Areasupporting

confidence: 60%

“…Interest in submerged coastal engineering has increased over the last decade due to multi-purposing [9], such as coastal protection and public amenities [13][14][15][16][17][18]. Submerged structures are able to control wave energy and maintain the dynamic equilibrium of the shoreline in their lee [10,13,18,19]. To optimize the benefits of a submerged structure in the coastal zone, a world-class natural reef design can be reproduced to develop a qualitatively good surf-breaking wave [16,20], similar to any other beach use, the development of which could support the local economy [21].…”

Section: Introductionmentioning

confidence: 99%

“…Through field, laboratory, and numerical modeling, studies of submerged structures have established relationships between the response of the coast with the submerged structure's dimensions and its environmental parameters [10,[17][18][19]. These models do not explain the mechanisms causing erosion or accretion at the lee of a submerged structure.…”

Section: Introductionmentioning

confidence: 99%

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Beach Morphodynamic Response to a Submerged Reef

Nemes

Criado-Sudau

Gallo

2019

Water

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To develop beach engineering, the submerged structure’s primary physical functions have to be understood. This study focuses on submerged structures in order to understand the strategy of reduced wave energy, stabilizing the shoreline and not generating erosion or adversely modifying coastal processes. Important developments have been made since the 1990s, taking into account the functions of recreational amenity. However, non-dimensional models cannot explain the physical mechanisms that generate accretion or erosion morphological features in the lee of the submerged structure. The present study aims to collaborate with the understanding of the mechanism of beach response to a submerged structure. For this, 26 surveys were made using topographic, Lagrangian, and Eulerian hydrodynamic measures during one seasonal cycle of a beach system from Rio de Janeiro (Brazil) with a natural submerged reef or rocky bank V-shape in the plan. This beach system is energetic and intermediate when referring to wave energy conditions and beach states, respectively. The wave breaking vector system on the rocky bank’s geometry was examined in the intermediate and dissipative beach morphodynamic organization. The variability of the wave breaking vector system determines the establishment, deformation, and erosion features in the lee of the structure. During high-energy waves, the submerged structure’s hydrodynamic and morphodynamic processes are transparent. When the submerged structure combines with the dissipative beach state, the surfing wave conditions are improved. These results provide the dimensional and positional references for an engineering proposal for a beach system.

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Section: Study Areasupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beach Morphodynamic Response to a Submerged Reef

Nemes

Criado-Sudau

Gallo

2019

Water

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“…The main parameters controlling shoreline response in the presence of LCDBs are distance offshore, length and orientation of the structure, transmission characteristics of the structure, depth at the structure, freeboard height, and wave characteristics [7,8]. Previous works have extensively investigated the stability, performance, and ecological impact of rubber-mound (conventional) LCDBs [8][9][10][11], but less effort has been devoted to understanding the performance of unconventional LCDBs (e.g., sand-filled geosystems and artificial reefs) until more recently (e.g., [12][13][14][15]).…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the construction of breakwaters with the use of synthetic materials, such as geotextile tubes filled with sand, has become widespread in some countries owing to their lower permanent impact on natural coastal processes [15]. Other approaches have considered the use of modular structures, such as artificial reefs (e.g., Reef Ball™), that mimic the wave dissipation effects of natural coral reefs.…”

Section: Introductionmentioning

confidence: 99%

Morphodynamic Response to Low-Crested Detached Breakwaters on a Sea Breeze-Dominated Coast

Torres-Freyermuth

Medellín

Mendoza

et al. 2019

Water

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Low-crested detached breakwaters (LCDBs) have been widely employed as a mitigation measure against beach erosion. However, only a few studies have assessed their performance in sea-breeze-dominated environments. This work investigates the beach morphodynamics behind LCDBs deployed on a micro-tidal sea-breeze-dominated beach. The study area, located in the northern Yucatán peninsula, is characterized by low-energy, high-angle waves, which drive a persistent (westward) alongshore sediment transport (O(104) m3/year). High-resolution real-time kinematics global positioning system (GPS) beach surveys were conducted over a one-year period (2017–2018) to investigate the performance of LCDBs at three sites. Moreover, unmanned aerial vehicle flights were employed to evaluate far-field shoreline stability. Field observations revealed a distinct behavior in the three study sites, dependent on the breakwaters’ transmission characteristics, geometry, stability, and shoreline orientation. Impermeable LCDBs, made of sand-filled geosystems, induced significant beach accretion (erosion) in up-(down-)drift areas. On the other hand, permeable LCDBs, made of Reef Ball™ modules, induced moderate beach changes and small erosion in down-drift areas owing to higher transmission coefficients. Measurements of LCDBs’ freeboard height show that sand-filled geosystems’ breakwaters presented a significant loss of sand during the study period, which explains the unexpected beach morphodynamic response on the lee side of the structure. Observations suggest that the study area is highly sensitive to the presence of LCDBs with low transmissivity.

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