Studies on Factors Influencing Hydrodynamic Characteristics of Plates Used in Artificial Reefs

Tang, Yanli; Yang, Wenzhao; Sun, Lei; Zhao, Fenfang; Long, Xiangyu; Wang, Gang

doi:10.1007/s11802-019-3706-z

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…One unanticipated finding was that the hollow AR (A2) with open holes had a better flow field effect than the solid AR (A1). These results corroborated the findings of a several previous studies (Wang et al, 2018;Tang et al, 2019;Nie et al, 2022), demonstrating that opening holes has a significant influence on the flow field of AR. Wang's study suggested that the flow effect of AR can be improved by the appropriate cut-opening ratio (OR), especially back vortex flow.…”

Section: Fuzzy Comprehensive Evaluation Of the Flow Field Effects Of ...supporting

confidence: 92%

An evaluation method for determining the optimal structure of artificial reefs based on their flow field effects

Ding

et al. 2022

Front. Mar. Sci.

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To design artificial reef (ARs) structures that can provide better habitats for fish, extensive research has been conducted on the flow field effects of ARs with different structures. The evaluation indices of the flow field effects include upwelling and back vortex flow. However, there has been little quantitative analysis of these two indices. In addition, several studies have suggested that other flow field characteristics of ARs can aid in providing habitats for fish. To evaluate the flow field effects of ARs more comprehensively, the following work was conducted in this study. First, the flow field of the solid cubic AR was simulated using a computational fluid dynamics (CFD)-based software (Fluent), and based on the particle image velocimetry (PIV) approach, these simulation results were verified by flume experiments. Next, the flow fields of ARs with other structures (hollow cube, solid triangular pyramid, hollow triangular pyramid, solid truncated rectangular pyramid, and hollow truncated rectangular pyramid) were simulated using the verified numerical model. Subsequently, based on the analytic hierarchy process (AHP) approach, an evaluation model with six evaluation indices of the flow field effect of ARs (upwelling region, wake region, surface area of ARs, upper slow-flowing area, lateral slow-flowing area, and internal velocity of ARs) was established, and the weights of the evaluation indices were determined using the entropy weight method (EWM). Finally, to determine the structure of ARs with optimal flow field effects, the evaluation model was used for evaluating the flow field effects of all ARs. The superiority and ranking of the flow field effects of all ARs were calculated using the fuzzy comprehensive evaluation (FCE) method. This study provides a theoretical basis and reference for the optimization of AR structures.

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Section: Fuzzy Comprehensive Evaluation Of the Flow Field Effects Of ...supporting

confidence: 92%

An evaluation method for determining the optimal structure of artificial reefs based on their flow field effects

Ding

et al. 2022

Front. Mar. Sci.

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“…This fact can be observed from the change in the drag coefficient C d of the reef model. It has been reported that the drag coefficient C d of reef decreases linearly with the increase in the open-area ratio (Tang et al, 2019). The drag coefficient indicates the blocking effect of the reef on the incoming flow.…”

Section: Effect Of Cut-opening On the Maximum Equilibrium Scour Depthmentioning

confidence: 96%

Experimental Investigation of Local Scour Around Artificial Reefs in Steady Currents

Tang

Wei

Yang

et al. 2021

J. Ocean Univ. China

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Artificial reef is a man-made object that is deployed purposefully on the seafloor to restore the offshore fishery resources and the ecological environment. To secure its ecological effects, it is important to study the possible instability of artificial reefs, like drifting and reversing caused by burial and scour in different seafloor conditions. In the present study, experiments of local scour around an artificial reef are carried out in steady currents. The effect of the open-area ratios and the open-hole heights of the cubic reefs, and the bottom angles of the triangular reefs on the time-scale of the scour process and the equilibrium scour depth are investigated. The results indicate that for the cubic artificial reef, the scour depth decreases with the increasing open-area ratios, and increases with the increasing open-hole heights. In the present study, the optimal prototype of the cubic reef with an open-area ratio of 0.49 and open-height of 0.7 m produces the minimum scour depth. For the triangular reef, the scour depth increases when the bottom angle increases. Moreover, based on the experimental results, empirical equations of the effects of the cut-opening and the bottom angle on the maximum equilibrium scour depth are proposed. The formulas will provide theoretical support and practical guidance for the optimized design and construction of artificial reefs.

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“…Traditional artificial reefs can decelerate flow and provide shelters for local communities to inhabit. For box-type artificial reefs, cut-opening ratio dominates the upwelling and back eddy [18][19][20], and the aspect ratio of reef arrangements affects the internal turbulence [21]. Incident angle, spacing distance and upper surface rugosity of untraditional artificial reefs may alter the wake region as well [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Beach Profile Evolution with and without an Artificial Reef

Kuang,

Fan,

Han

et al. 2023

Water

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With the recent development from grey infrastructures to green infrastructures, artificial reefs become more popular in coastal protection projects. To investigate the responses of beach profile evolution to the presence of an artificial reef, a non-hydrostatic model is established. Both hydrodynamic and morphodynamic evolution for the beach with and without an artificial reef are compared under regular wave conditions. In addition, the protected beach profile evolution by an artificial reef is discussed under irregular wave conditions. Three key parameters in non-hydrostatic simulation are considered for sensitivity analysis, including maximum wave steepness criterium (maxbrsteep), water depth factor (depthscale), and equilibrium sediment concentration factor (sedcal). The numerical results under regular wave conditions indicate that the artificial reef enhances wave attenuation by inducing wave breaking. In addition, the artificial reef reduces local flow velocity and offshore sediment transport by 51%, therefore decrease the total erosion by 53%. Over the artificial reef, wave skewness and asymmetry go through a drastic change. Under irregular wave conditions, short waves contribute to the wave energy mainly and reflection-induced standing wave effects decline considerably. It demonstrates that the artificial reef can protect the beach from regular and irregular waves by reducing erosion and offshore transport of suspended sediments. Moreover, in the wave breaking area, the increase of maximum wave steepness criterium may give arise to the wave height. The morphological evolution is more sensitive to water depth factor than equilibrium sediment concentration factor, because the former is a controlling factor for beach profile characteristics while the latter forms the sandbar varying irregularly in shape.

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Studies on Factors Influencing Hydrodynamic Characteristics of Plates Used in Artificial Reefs

Cited by 10 publications

References 16 publications

An evaluation method for determining the optimal structure of artificial reefs based on their flow field effects

An evaluation method for determining the optimal structure of artificial reefs based on their flow field effects

Experimental Investigation of Local Scour Around Artificial Reefs in Steady Currents

Numerical Modelling of Beach Profile Evolution with and without an Artificial Reef

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