Numerical Simulation Study on Environment-Friendly Floating Reef in Offshore Ecological Belt under Wave Action

Pan, Yun; Tong, Huanhuan; Zhou, Yarui; Liu, Can; Xue, Dong

doi:10.3390/w13162257

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…For the detailed numerical model establishment method of single-layer floating reefs, this study refers to [20], which verified the accuracy of the numerical model through physical model tests. So this section only focuses on how to connect layered floating reefs.…”

Section: Model Construction Methodsmentioning

confidence: 79%

“…The layered floating reef is a reef tied by a cable above the single-layer reef in Reference [20] and connected to the corresponding four end angles of the upper and lower floating frames with cables, as shown in Figure 1a,b. Therefore, the key point of the establishment of the layered floating reef hydrodynamic numerical model is the connection between the floating frame, the cable and the floating frame; that is, the data exchange between the physical quantities of multiple similar objects.…”

Section: Model Construction Methodsmentioning

confidence: 99%

“…A wave force calculation method is proposed by Liu et al [18] to accurately describe the motion state of the floating body under wave conditions and the force of the mooring system by solving the geometric relationship. Pan et al [19,20] and Wang et al [21] proposed floating reefs with frame structure and expounded in detail the processing method of coupling force and movement of floating reefs, the judging method of floating reefs out of the water surface, the correction method of water mass point velocity and acceleration, etc.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Hydrodynamic Characteristics of Layered Floating Reefs under Tidal Currents and Waves

Pan,

Yang,

Xue

et al. 2023

Water

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Artificial floating reefs are an important supplement to bottom reefs in marine habitat construction, which provide a good environment for fish to survive, breed and habituate in the middle and upper layers of water. They can adapt to the silt bottom of the East China Sea. To make full use of the water space and improve the effective space of the floating reef, based on the field tidal current data, an upper- and lower-layered artificial floating reef has been designed in this study. The connection method of the upper and lower reefs has been described in detail and a hydrodynamic numerical model has been established. At the same time, the effects of floating reef structure ratio, wave height and wave steepness on its force and motion are discussed under the action of tidal current and wave current. The result shows that, at a specific flow rate, the change of the proportion of the layered floating reef structure had little effect on the roll of the upper and lower reefs. The maximum roll angle does not exceed 15°, and the tilt angle of the upper and lower reefs is consistent, which ensures the good flow resistance and stability of the floating reef. Under the specific length of the connecting cable and the main mooring, the hydrodynamic characteristics of the layered floating reef are better when the ratio of the sum height of the lower reef and the connecting cable to the height of the upper reef is not greater than one and the extreme proportion structure is not considered. The tension of the stratified floating reef is proportional to the wave height and wave steepness under the action of wave and current. The main mooring rope is the most stressed, and the rolling motion of the upper and lower reefs is consistent. Above all, results can provide a theoretical basis for the optimization design of the artificial floating reef structure.

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Section: Model Construction Methodsmentioning

confidence: 79%

Section: Model Construction Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Hydrodynamic Characteristics of Layered Floating Reefs under Tidal Currents and Waves

Pan,

Yang,

Xue

et al. 2023

Water

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“…According to the Morison equation, the forces acting on the unit of slender cylinder under typhoon waves mainly include drag force and inertia force, as well as the gravity, the buoyancy of seawater and the tension of mooring cable. For the specific calculation methods of the drag force and inertia force of the units of slender cylinder, please refer to Pan et al [33] and Zhu et al [34,35]. The drag coefficient and inertia coefficient in x, y z directions are shown in Table 1.…”

Section: Simulation Methods Of a Slender Cylindermentioning

confidence: 99%

A Computation Method for the Typhoon Waves Using the Field Wave Spectrum

et al. 2022

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Wave features and propagation characteristics during typhoons are the key factors to study the dynamic response of ocean engineering and coastal disaster prevention and mitigation under extreme climate. Based on the Longuet-Higgins theory, the method of the field spectrum during the typhoon was used to compute the typhoon waves. And the directional spectrum, the formulas of wave surface, the velocity of water particles, and the acceleration of water particles were investigated. The results showed that the interpolated field wave spectrum combined with the SWOP direction spectrum could accurately simulate the three-dimensional typhoon waves. The significant wave height and the average period of the simulated wave surface at fixed point were statistically evaluated by the upward zero-crossing method, and the relative errors were ± 5% and ± 15%, respectively. The typhoon wave surface computed by a dual peak spectrum had small periodic waves, and the velocity and acceleration of water particles differed considerably from the JONSWAP spectrum. Finally, a fastened slender cylinder was simulated under action of the typhoon waves, which proved the applicability of the computation method. This study aims at providing a basis for the simulation of the dynamic response of marine structures under the typhoon waves action.

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“…Additionally, transportation difficulties and the installation of large and heavy ARs hindered the construction of high-rise and floating ARs. Recently, plastic-based materials, such as polyvinyl chloride (PVC) and polypropylene (PP), have shown the potential of constructing high-rise ARs and keeping the reefs elastic with easy installation, lightweight, and with comparable durability [25][26][27]; however, the studies on ARs using flexible materials and their performance assessment are relatively few.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Attractive Effects of Floating Artificial Reefs and Combination Reefs on Six Local Marine Species

Han

Liu

Kinoshita³

et al. 2023

Fishes

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Artificial reefs (ARs) have been advocated for and implemented as management tools for recreational fisheries, species conservation, and habitat replacement; however, the research that includes attracting marine species of floating ARs remains in its early stages. Here, two types of floating ARs were designed to evaluate the attractive effects using the occurrence rate and attracting index for six commercially important species (Lateolabrax maculatus, Liza haematocheila, Sebastes schlegelii, Acanthopagrus schlegelii, Litopenaeus vannamei, and Amphioctopus fangsiao) in the Bohai Bay of China; their combined ARs were meanwhile compared with two variants of artificial seagrass beds (SA and SB) and the traditional double-frame artificial reef (TD). All of the designed ARs were effective in attracting experimental species. The ARs with higher shelter areas (SB and TD) showed a better attracting effect. The efficiency of the ARs in attracting different species depended on their life histories. The bottom-mounted ARs were more efficient in attracting demersal species, while the floating ARs attracted epipelagic fish. In addition, the combined reefs had a better attractive effect than single ARs did. Overall, floating ARs and their combined ARs show the potential to deploy especially for attracting epipelagic fishes, although further study is needed.

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Numerical Simulation Study on Environment-Friendly Floating Reef in Offshore Ecological Belt under Wave Action

Cited by 7 publications

References 19 publications

Numerical Simulation of Hydrodynamic Characteristics of Layered Floating Reefs under Tidal Currents and Waves

Numerical Simulation of Hydrodynamic Characteristics of Layered Floating Reefs under Tidal Currents and Waves

A Computation Method for the Typhoon Waves Using the Field Wave Spectrum

Assessing the Attractive Effects of Floating Artificial Reefs and Combination Reefs on Six Local Marine Species

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