Regulation of Nearshore Circulation by Submerged Breakwater for Shore Protection

Nobuoka, Hisamichi; Irie, Isao; Katô, Hajime; Mimura, Naoya

doi:10.1061/9780784402429.185

Cited by 8 publications

(9 citation statements)

References 2 publications

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“…The results indicated that the submerged breakwaters led to increased shoreline retreat. Circulation patterns observed in the vicinity of the submerged breakwater were similar to those observed by Nobuoka et al (1996), i.e. onshore flow over the structure and offshore flow in the gaps.…”

Section: Physical Modellingsupporting

confidence: 68%

“…The main characteristics of the numerical modelling studies discussed below are summarised in Table 3. Nobuoka et al (1996) described the application of a 2DH circulation model to verify the observations made in their laboratory experiments. The depth-averaged circulation pattern obtained for the submerged reef case is reproduced here in Fig.…”

Section: Numerical Modellingmentioning

confidence: 99%

“…The magnitude of the currents were found to be dependent on the crest level, length of structure, distance from shoreline to structure, and incident wave height. Nobuoka et al (1996) also described a fixed bed, laboratory experiment where the circulation patterns in the vicinity of a submerged breakwater were investigated. The experiments were undertaken in a small wave basin approximately 2.5 m long and 1.7 m wide.…”

Section: Physical Modellingmentioning

confidence: 99%

“…The morphological response for the 1-year simulations presented 9. The depth averaged nearshore circulation pattern in the vicinity of a submerged breakwater predicted by the 2DH numerical model used by Nobuoka et al (1996).…”

Section: Numerical Modellingmentioning

confidence: 99%

See 3 more Smart Citations

Shoreline response to submerged structures: A review

Ranasinghe

Turner

2006

Coastal Engineering

150

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Section: Physical Modellingsupporting

confidence: 68%

Section: Numerical Modellingmentioning

confidence: 99%

Section: Physical Modellingmentioning

confidence: 99%

Section: Numerical Modellingmentioning

confidence: 99%

See 2 more Smart Citations

Shoreline response to submerged structures: A review

Ranasinghe

Turner

2006

Coastal Engineering

150

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“…Lorenzoni et al (2010) demonstrated that the total horizontal force on 458 inclined blades was approximately 50% larger than the force on vertical blades, and the drag forces were stronger than the inertial forces. Their results confirmed results described by Nobuoka et al (1996), who showed that a structure with multiple blades inclined at 458 caused the strongest onshore currents on the side of a structure. Cho, Lee, and Kim (2004) investigated the occurrence of resonant reflection of monochromatic waves over an array of rectangular and trapezoidal submerged breakwaters by using physical experiments.…”

Section: Introductionsupporting

confidence: 93%

A Study of Long Wave Attenuation over Composite Undulating Breakwaters

Shih

Weng

2016

Journal of Coastal Research

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Shih, R.-S. and Weng, W.-K., 0000. A study of long wave attenuation over composite undulating breakwaters. Journal of Coastal Research, 00(0), 000-000. Coconut Creek (Florida), ISSN 0749-0208.In this study, the wave attenuation of multiple impermeable sinusoidal profile breakwaters is investigated by a physical experiment conducted in a 21-m wave flume with a combination of breakwaters collocated with various widths (w) and heights (D). The breakwaters were arranged in different permutations and combinations (from one to three sets) on the bottom of various undulating slopes. The attenuation effect when waves propagated through the periodic-gradational undulating terrain was explored, and the optimization of various sinusoidal breakwaters was analyzed. This article discusses the properties of wave reflectance (K r ), transmittance (K t ), the energy loss coefficient (K L ), and the attenuation of composite terrain, including the optimal combinations of obstacles. The values of K r , K t , and K L were diverse because of various breakwater combinations and various wave conditions. The results indicated that the attenuation of long waves was effective and was affected by nonlinearity and dispersion. Wave decomposition occurred when a wave passed through the breakwaters; a high-frequency fluctuation appeared and dissipated the energy of long waves. The transmittance indicated that a composite of rapidly varying combinations was more favorable than a gradually varying section. Increasing the quantity of composite breakwaters also improved the attenuation effect on both the rapidly varying cases and the segmented gradually varying cases. The optimal combination required to eliminate the energy of long waves was also examined and confirmed using a solitary wave test. ADDITIONAL INDEX WORDS:Composite undulating breakwater, reflection coefficient, transmission coefficient, wave attenuation, long wave, solitary wave.

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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

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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 ,

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Regulation of Nearshore Circulation by Submerged Breakwater for Shore Protection

Cited by 8 publications

References 2 publications

Shoreline response to submerged structures: A review

Shoreline response to submerged structures: A review

A Study of Long Wave Attenuation over Composite Undulating Breakwaters

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

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