Experimental Study on Wave Attenuation Performance of A New Type of Floating Breakwater with Twin Pontoons and Multi Porous Vertical Plates

Shen, Yusheng; Pan, Junning; Zhou, Yiren; Wang, Xinggang

doi:10.1007/s13344-022-0034-7

Cited by 14 publications

(6 citation statements)

References 24 publications

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“…Figure 5 shows a comparison between the results of the transmission coefficient of different structural forms and the change in the wave steepness H/L under a fixed wave height, in which the wave height of the fixed comb-type floating breakwater and the fixed pontoon-type floating breakwater is H = 0.1 m [16]. The width of the fixed rectangular pontoon floating breakwater is 0.5 m, the water depth is 0.6 m, and the draft depth is 0.16 m. Since the wave heights of the floating pontoon breakwater in the literature are H = 0.075 m and 0.125 m [18], the transmission coefficient under the condition of H = 0.1 m is taken as the average value to enable comparison. The width of the floating pontoon breakwater is 0.5 m, the water depth is 0.6 m, and the draft depth is 0.15 m. The ratio of draft depth to water depth of the rectangular structure is relatively close to that of the comb structure in the present study.…”

Section: Comparisons With Existing Resultsmentioning

confidence: 99%

Experimental Study on the Hydrodynamic Characteristics of a Fixed Comb-Type Floating Breakwater

Wang

Fang

Zang

et al. 2023

Water

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A comb-type floating breakwater is a new wave dissipation structure with particular force and dissipation performance advantages due to the two wave-reflecting surfaces. In this article, physical model experiments are used to study the hydrodynamic characteristics of a fixed floating comb breakwater and two structural optimization-based measures under the combined action of regular waves, irregular waves, and wave currents. The effects of factors such as the relative width, relative wave height, water flow velocity, and irregular waves on the transmission coefficient of the breakwater are analyzed. In addition, the characteristics of the transmission wave waveform are analyzed based on the time and frequency domains. The results show that (1) the wave transmission coefficient of a comb-type floating breakwater is lower than that of a rectangular floating box for long-period waves, while the transmission coefficient is larger than that of a rectangular floating box for short-period waves. (2) Under combined current and waves, the superimposition of bidirectional currents can increase the transmission coefficient, and the transmission coefficient increases with increasing current speed. The superimposition of the anti-directional current can decrease the transmission coefficient. (3) Moreover, with the same wave parameters, the transmission coefficient for irregular waves is larger than that of regular waves. (4) Finally, extending the bottom plate and adding lower baffles can effectively enhance the wave dissipation effect of the comb-type floating breakwater while also stabilizing the transmitted wave waveform.

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Section: Comparisons With Existing Resultsmentioning

confidence: 99%

Experimental Study on the Hydrodynamic Characteristics of a Fixed Comb-Type Floating Breakwater

Wang

Fang

Zang

et al. 2023

Water

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“…Floating box-plate breakwaters mainly include vertical and horizontal plates, among which vertical plates have poor wave protection under short-period waves, while horizontal plates have problems such as low structural safety [26]. Shen Yusheng et al [27] compared the wave protection effect of a double-row floating box with that of a single floating box type, finding that the wave protection effect of the former was significantly better than that of the latter; they also conducted a comparison of the wave protection effect when a double-row floating box was connected in different ways, and the results showed that the wave protection effect was the best when it was rigidly connected. Liu Weijie et al [28] invented a circular floating breakwater, including multiple circular arc-shaped floating breakwater units with the same radius of curvature connected, which does not need to consider the main wave direction, wave bypassing, etc., and forms a smooth circular area of water at sea; in addition, the distance between the inner and outer circles can be set independently according to the wavelength.…”

Section: Wave-proof Floating Photovoltaicmentioning

confidence: 99%

Review of Recent Offshore Photovoltaics Development

Wang

Lund

2022

Energies

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Photovoltaic power generation (PV) has significantly grown in recent years and it is perceived as one of the key strategies to reach carbon neutrality. Due to a low power density, PV requires much space, which may limit PV expansion in the future. Placing PV on water has therefore become an interesting alternative siting solution in several countries. China has the largest fleet of water floating photovoltaic power stations. Water-based PV is typically installed on inland shores, but now offshore areas may become the next step of development. In this paper, the background of offshore photovoltaic power generation and an analysis of existing offshore photovoltaic systems is presented. Fixed pile-based photovoltaic systems are stationary PV systems in offshore or tidal areas characterized by higher safety, but also a higher initial investment. Wave-proof PV systems are highly modular, easier to install, and more practical in countries with high population density and less available land. Floating platform photovoltaic systems are built on a floating platform with a floating body and frame structure. The photovoltaic module is installed on the floating platform at a certain height, which can avoid the direct action of waves. Floating thin-film PV is one of the most recently developed water-based PV systems. It has a reinforced film that can fluctuate with the waves, adapting to the wave and wind load. This paper finally discusses the challenges encountered by offshore PV and presents future prospects.

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“…Yang et al [6] introduced a novel floating rectangular box breakwater featuring a conical bottom section, which exhibits a notable capacity to resist overturning owing to its low center of gravity position. Shen et al [7] conducted an experimental investigation on the wave attenuation capabilities of a novel floating breakwater design featuring twin pontoons and multiple porous vertical plates. Their findings revealed that this proposed floating breakwater design outperforms the conventional single pontoon type in terms of wave attenuation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Wave Dissipation and Mooring Force of a Horizontal Multi-Cylinder Floating Breakwater

Zang,

Fang,

Qiao

et al. 2024

JMSE

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A three-dimensional numerical model was established based on ANSYS-AQWA (R19.0) software for the purpose of analyzing the hydrodynamic characteristics of a floating breakwater. This study examines three distinct floating breakwaters with different cross-sectional designs in order to evaluate their respective wave dissipation capabilities. It is suggested that the horizontal multi-cylinder floating breakwater exhibits a superior ability to dissipate waves when compared to both the single-cylinder and square pontoon configurations and can be deemed the most advantageous shielding strategy for potential engineering applications. Subsequently, this study examines the effects of influential parameters, including a large cylinder diameter, a small cylinder diameter, the angular position of the small cylinder, and the height and period of the incident wave, on the wave transmission coefficient. An empirical formula for the wave transmission coefficient was derived based on the numerical results. Additionally, the effects of influential parameters, including wind speed, current velocity, incident wave height and period, and water depth, on the maximum total mooring force were investigated. Furthermore, an empirical formula for the maximum total mooring force is proposed for practical implementation in engineering.

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Experimental Study on Wave Attenuation Performance of A New Type of Floating Breakwater with Twin Pontoons and Multi Porous Vertical Plates

Cited by 14 publications

References 24 publications

Experimental Study on the Hydrodynamic Characteristics of a Fixed Comb-Type Floating Breakwater

Experimental Study on the Hydrodynamic Characteristics of a Fixed Comb-Type Floating Breakwater

Review of Recent Offshore Photovoltaics Development

Numerical Study on Wave Dissipation and Mooring Force of a Horizontal Multi-Cylinder Floating Breakwater

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