Effect of hole diameter of rotary-shaped artificial reef on flow field

Jiang, Zhaoyang; Liang, Zhenlin; Zhu, Lixin; Guo, Zhansheng; Tang, Yanli

doi:10.1016/j.oceaneng.2020.106917

Cited by 22 publications

(6 citation statements)

References 30 publications

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“…It is necessary to study the hydrodynamic characteristics of an artificial reef to ensure their long-term operational safety. After more than 30 years of exploration, the hydrodynamic characteristics of artificial reefs have been studied by numerous researchers and fruitful results have been obtained (Tamura et al, 2007;Zheng et al, 2015;Yaakob et al, 2016;Wang et al, 2018;Jiang et al, 2020). Nevertheless, most studies have focused on the single reef or artificial reef cluster, which is mainly based on numerical and experimental results.…”

Section: Significance Of Artificial Reef Constructionmentioning

confidence: 99%

Review of Structure Types and New Development Prospects of Artificial Reefs in China

et al. 2022

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Artificial reefs are beneficial to restore fishery resources and increase fishery production. Meanwhile, they play a significant role in improving ocean ecology and accelerating the evolution of fishery industries. Since they are generally affected by currents, waves, and other hydrological factors, the flow field around artificial reefs and their stabilities have become a research hotspot in recent years. Research on artificial reefs is a systematic process consisting of four aspects: Firstly, the significance, the definition, the mechanism, and the present research progress were introduced for artificial reefs in detail. Secondly, the development trend of the sit-bottom artificial reef and that of the floating artificial reef were summarized, respectively. Thirdly, it was found that the combination of traditional artificial reefs and emerging ocean engineering has a great development potential in practical engineering. Finally, the existing problems related to the hydrodynamic characteristics of the artificial reefs in China were summarized, and the prospects of artificial reefs were proposed. The purpose of this study is to provide a scientific reference for the ecological and sustainable development of the large-scale construction of artificial reefs in the ocean.

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Section: Significance Of Artificial Reef Constructionmentioning

confidence: 99%

Review of Structure Types and New Development Prospects of Artificial Reefs in China

et al. 2022

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“…Wake regions have been characterized in terms of wake length (WL) [49], wake area (WA) [34], and flow velocity profile in a certain plane [50][51][52][53]. However, the determination of WL and WA depends on how the wake plane was chosen and, accordingly, these measures cannot account for a wake region with one figure.…”

Section: Wake Regionmentioning

confidence: 99%

Wake Region Estimates of Artificial Reefs in Vietnam: Effects of Tropical Seawater Temperatures and Seasonal Water Flow Variation

Jung

2020

Sustainability

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From the perspective of saving energy of marine species and creating feeding areas, the wake volume of an artificial reef (AR) should be considered as a parameter in any wake region estimation. Wake regions of AR modules (reef ball, cylinder reef, and cube reef) and sets were numerically estimated considering tropical seawater temperatures and water flow variation in Vietnamese coastal waters. In addition, we considered an efficiency index (i.e., total wake volume per reef volume) and wake volume diagram (i.e., wake volume dependency on water flow direction) to characterize wake volumes. From the results, first, it was found that the effect of temperature on the wake volumes was minor in comparison with the effect of flow direction. It was also found that the optimum installation angles were 30° (reef ball and its set), 30° (cylinder reef and its set), and 0° (cube and its set) along the major flow direction. Second, it was found that the cylinder reef and its set were attractive because they generated the maximum wake volumes, regardless of seawater temperature. Thus, the module and set showed better average efficiency indices (9.28 for module and 6.81 for set) than the other cases. We found that the wake volume was dominant in the efficiency index and, accordingly, wake volume diagrams are sufficient to indicate the dependence on flow direction.

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“…Previous research has used both experimental and numerical simulation techniques to quantify the size and range of wake regions behind ARs (Kim et al, 2016;Kim et al, 2019;Kim et al, 2021). These studies examined the relationship between the wake region range and various reef structure characteristics, including opening design, roughness, complexity, arrangement, and combination of ARs (Liu and Su, 2013;Jiang et al, 2016;Wang et al, 2018;Jiang et al, 2020;Wang et al, 2021;Jung et al, 2022;Zhou et al, 2022;Kim et al, 2022). When ARs are arranged around the OWF, the wake region can converge with the horseshoe vortex at the bottom of the OWF and disrupt the turbulent structure, reducing the transport capacity of the horseshoe vortex for sediment and providing scour protection, as shown in Figure 1B.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of offshore wind power pile foundation scour with different arrangements of artificial reefs

et al. 2023

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The industrial integration of offshore wind power and marine ranches has been actively explored and developed in many countries. This emerging industrial synergy can significantly improve the ecological friendliness of offshore wind power and contribute to the development of the marine economy in the region. This industrial synergy is an important development direction for future offshore engineering. Artificial reefs (ARs) are critical components of marine ranches and are widely placed around offshore wind foundations (OWFs). The ARs can block the water flow and form a complex wake region behind it, which changes the original turbulence structure and reduces scour around the OWF. Therefore, determining the arrangement of ARs for scour protection around an OWF is of great engineering significance. In this study, a three-dimensional numerical model is established using a prototype of the first offshore wind power-marine ranch demonstration project in China. The turbulent change and sediment movement between the OWF and ARs are solved using the Reynolds-averaged Navier-Stokes (RANS) and sediment transport equations. Moreover, the variations in the maximum scour depth and scour volume around the OWF at different arrangements of ARs are explored. The results demonstrate that the arrangement of ARs weakens the horseshoe vortices in front of the OWF and destroys the vortex shedding behind the OWF, thereby producing a beneficial scour protection effect. Various arrangements of ARs have different effects on scour results around the OWF. Increasing the height of the AR could significantly reduce the scour results around the OWF and play an effective role in scour protection, followed by the tandem arrangement of ARs, whereas the parallel arrangement of ARs will produce negative scour effects. This study will serve a vital guiding role in the arrangement of ARs and practical significance for scouring protection around the OWF.

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Effect of hole diameter of rotary-shaped artificial reef on flow field

Cited by 22 publications

References 30 publications

Review of Structure Types and New Development Prospects of Artificial Reefs in China

Review of Structure Types and New Development Prospects of Artificial Reefs in China

Wake Region Estimates of Artificial Reefs in Vietnam: Effects of Tropical Seawater Temperatures and Seasonal Water Flow Variation

Numerical simulation of offshore wind power pile foundation scour with different arrangements of artificial reefs

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