Solid and Permeable Submerged Breakwaters

Dick, T. Milne; Brebner, Arthur

doi:10.9753/icce.v11.72

Cited by 39 publications

(11 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The physical experiments and theoretical results (e.g. Dick and Brebner, 1968;Hsu and Wu, 1998;Wang and Shen, 1999;Usha and Gayathri, 2005) showed that the optimum width of a simple, fixed plate was around 0.32-0.5 of the incident wavelength. Thus it is important to know when and where such a local minimum appears in a vegetated platform.…”

Section: Resultsmentioning

confidence: 99%

Numerical simulations of wave propagation over a vegetated platform

Chen

Jin

et al. 2016

Coastal Engineering

View full text Add to dashboard Cite

Vegetated platforms have been constructed in recent years for the purpose of shore protection. This paper addresses some fundamental questions concerning the vegetated platform: (1) What is the difference in wave attenuation between a vegetated platform and a simple platform, and how much can vegetation increase the efficiency of reducing wave transmission? (2) Are there any differences between the effects of stems and roots on wave attenuation? (3) Does vegetation always reduce wave transmission? (4) Is it possible to develop an empirical formula for estimating the wave transmission of a vegetated platform? To answer the above questions, a numerical model solving the Navier-Stokes equations for wave propagation over a vegetated platform is established and validated by several existing laboratory experiments. A total of 244 numerical experiments based on this model have been carried out. The simulated results suggest that the platform plays a major role and the vegetation plays a supporting role in reducing wave transmission except for some special cases. Stems tend to have a larger influence than roots in reducing wave transmission with the same height. The roots always help reduce wave transmission, while the stems may increase wave transmission when the platform width is in the range of 37.5-62.5% of the incident wavelength. Based on our numerical experiments and existing laboratory data, the paper proposes a simple formula for predicting the wave transmission coefficient of a vegetated platform for engineering applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Numerical simulations of wave propagation over a vegetated platform

Chen

Jin

et al. 2016

Coastal Engineering

View full text Add to dashboard Cite

show abstract

“…There have been extensive research on the wave blocking performance of an SHP and the mechanism behind the performance. Dick and Brebner [1968] probably conducted the earliest experiment to investigate the wave re°ection and transmission of the SHP as a limit case of a permeable submerged rectangular. The method of matched asymptotic expansions was applied by Siew and Hurley [1977] to derive analytical expressions for the re°ection and transmission coe±cients of long wave by the SHP.…”

Section: Introductionmentioning

confidence: 99%

SPH Simulation of Wave Scattering by a Heaving Submerged Horizontal Plate

Gao

et al. 2018

International Journal of Ocean and Coastal Engineering

View full text Add to dashboard Cite

Liu et al. [Liu, C., Huang, Z. & Chen, W. [2017] “A numerical study of a submerged horizontal heaving plate as a breakwater,” J. Coast. Res.33(4), 917–930.] numerically studied the wave scattering by a heaving submerged horizontal plate (SHP) within the framework of the potential flow theory. They presented the excellent performance of the heaving SHP on wave blocking, because the radiated wave induced by the heave response of plate is likely to neutralize the transmitted wave. As a further study, the present work simulates the wave–heaving SHP interaction using the smoothed particle hydrodynamics, which is widely recognized as a powerful tool for computing complex viscous fluid dynamics. In this way, additional understanding on the wave blocking mechanism of the heaving SHP is contributed. The effect of submergence of plate on the wave and structural dynamics is also investigated. The results show that, under most submergence conditions, a heaving SHP breakwater is more effective than a fixed one. In terms of the limited cases in this research, 17% is proven to be the optimum ratio of submergence to water depth for the heaving SHP breakwater.

show abstract

“…Submerged structures to protect beaches have become popular recently because they are widely perceived as being capable of providing the necessary beach protection (Dean, Chen, and Browder, 1997) without any loss of beach amenity (Ranasinghe and Turner, 2006). Submerged breakwaters were used to protect harbor entrances, to control wave action at inshore fishing grounds, and to reduce the rate of littoral drift early in 1960s (Dick and Brebner, 1968). Many papers (Chang and Liou, 2007;Mendez, Losada, and Losada, 2001;Tunji, Hashim, and Yusof, 2012) have discussed the effects to waves caused by submerged breakwaters.…”

Section: Introductionmentioning

confidence: 99%

Effects of Submerged Breakwater on Hydrodynamics and Shoreline Change of the East Beach of Beidaihe, Bohai Bay, China

Kuang

et al. 2014

Journal of Coastal Research

View full text Add to dashboard Cite

Kuang, C.; He, L.; Gu, J.; Pan, Y.; Zhang, Y.; Yang, Y.; Qiu, R., and Zhang, J., 2014. Effects of submerged breakwater on hydrodynamics and shoreline change of the East Beach of Beidaihe, Bohai Bay, China. Journal of Coastal Research, 30(3), 598-614. Coconut Creek (Florida), ISSN 0749-0208.The beaches in Beidaihe of Bohai Bay of China have been eroded since 1950s, clearly evidenced by sand coarsening, rock outcropping, and slope steepening. Beach nourishment is a common coastal management strategy used to protect beaches from erosion along sandy coastlines, and it has already been applied to recover several beaches of Beidaihe since 2008. In this paper, the effects of a submerged breakwater used as part of a beach nourishment project on hydrodynamics and shoreline changes of the East Beach of Beidaihe are presented. First, the brief descriptions of phase I and phase II of the beach nourishment project of East Beach are given. And then numerical models, including tidal current model, wave model, and one-line model for simulating hydrodynamics (tidal currents and waves) and shoreline changes are established and verified by field measurements. These well-verified numerical models are adopted to compute the tidal current fields, wave fields, and shoreline changes of East Beach with and without the submerged breakwater. The results show that the submerged breakwater plays a very important role in protecting East Beach to a certain degree. The effects of alterations of the freeboard and the width and the length of the submerged breakwater on shoreline changes are also discussed, and the results show that increasing the above three parameters will better protect the beach. Overall, a submerged breakwater can play a certain role in protecting a beach against erosion; additional beach nourishment is needed to stabilize East Beach in long term.

show abstract

Solid and Permeable Submerged Breakwaters

Cited by 39 publications

References 4 publications

Numerical simulations of wave propagation over a vegetated platform

Numerical simulations of wave propagation over a vegetated platform

SPH Simulation of Wave Scattering by a Heaving Submerged Horizontal Plate

Effects of Submerged Breakwater on Hydrodynamics and Shoreline Change of the East Beach of Beidaihe, Bohai Bay, China

Contact Info

Product

Resources

About