Numerical investigation of flow with floating vegetation island

Ai, Yidan; Liu, Meng-Yang; Huai, Wenxin

doi:10.1007/s42241-020-0004-6

Cited by 25 publications

(10 citation statements)

References 47 publications

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“…2(b)). In floating vegetation, when the vegetation density is sufficiently large so as to provide enough resistance to induce an inflection point in the mean velocity profile at the vegetation interface, the vegetation-scale vortices would form and dominate the turbulence transport between the vegetation area and the gap region below floating vegetation [74][75][76][77] . Different from the common submerged vegetation described above, the growth of the outer layer of the floating vegetation is significantly inhibited by the bed boundary layer.…”

Section: Flow In Submerged and Floating Vegetationmentioning

confidence: 99%

Flow dynamics and sediment transport in vegetated rivers: A review

et al. 2021

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The significance of riparian vegetation on river flow and material transport is not in dispute. Conveyance laws, sediment erosion and deposition, and element cycling must all be adjusted from their canonical rough-wall boundary layer to accommodate the presence of aquatic plants. In turn, the growth and colonization of riparian vegetation are affected by fluvial processes and river morphology on longer time scales. These interactions and feedbacks at multiple time scales are now drawing significant attention within the research community given their relevance to river restoration. For this reason, a review summarizing methods, general laws, qualitative cognition, and quantitative models regarding the interplay between aquatic plants, flow dynamics, and sediment transport in vegetated rivers is in order. Shortcomings, pitfalls, knowledge gaps, and daunting challenges to the current state of knowledge are also covered. As a multidisciplinary research topic, a future research agenda and opportunities pertinent to river management and enhancement of ecosystem services are also highlighted.

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Section: Flow In Submerged and Floating Vegetationmentioning

confidence: 99%

Flow dynamics and sediment transport in vegetated rivers: A review

et al. 2021

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“…where f i is the vegetation-induced drag in the x i direction; i E u is the temporal averaged velocity component in the x i direction. More information about the porous model and coefficient C D can be found in Ai et al (2020).…”

Section: Flow Field Domainmentioning

confidence: 99%

Stochastic Simulation of the Suspended Sediment Deposition in the Channel With Vegetation and Its Relevance to Turbulent Kinetic Energy

Yang

Huai

Guo

2021

Water Resources Research

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The aquatic vegetation patch plays a significant role on sediment net deposition in the vegetated channels. Particularly, the flow is decelerated at the leading edge of a patch that tends to induce vertical updraft, that is, a diverging flow region, in which vegetation greatly affects the pattern of sediment net deposition. This study focuses on the simulation of the sediment net deposition in the whole vegetation patch region through an innovative random displacement model, a Lagrange method, with probability-based boundary conditions, instead of the reflection or sorption boundary at the channel bottom. The probability model of deposition and resuspension is proposed according to the flow field characteristics in the different regions of the vegetation patch. The variation of the sediment deposition and resuspension with the turbulent kinetic energy is analyzed to illustrate the effect of the turbulence induced by vegetation, represented by the dimensionless turbulent kinetic energy (ψ), on the sediment deposition and resuspension. The sediment deposition predicted by the proposed model agrees well with the experimental measurements. Results show that the effect of vegetation on the sediment deposition and resuspension motions begins to prevail when the vegetation-induced ψ is larger than its threshold, ψ * . The threshold of ψ is predicted to be within 6.8-10 according to the simulation results in this study. As the turbulent kinetic energy increases, the deposition probability decreases continuously when ψ > ψ * . YANG ET AL.

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“…When planning and assessing the aquaculture cages at larger-scale waters, the drag force imparted by the distributed structure on the fluid needs to be represented [29]. The loss of energy of the mean flow through cages is proportional to the drag force exerted by a single cage and the cage density within the marine aquaculture area [16,26,30,31]. Therefore, the drag force caused by suspended cages (Fig.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

Modeling the impact of culture facilities on hydrodynamic and solute transport in marine aquaculture waters of the North Yellow Sea

Jiang¹,

Ji²,

Zhang³

2021

Preprint

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An increasing number of marine aquaculture facilities are being placed in shallow bays and open sea. In this study, we present a coupled hydrodynamic and solute transport model with high-resolution schemes in marine aquaculture waters based on depth-averaged shallow water equations. A new expression of drag force is incorporated into momentum equations to express the resistance of suspended culture cages. The coupled model is used to simulate the effect of suspended structures on the tidal current and the motion of a contaminant cloud in the marine aquaculture of the North Yellow Sea, China. Simulation results show a low-velocity area inside the aquaculture cage area, with a maximum reduction rate of velocity close to 45% under high-density culture. The results also show that the tidal currents are sensitive to the suspended cage densities, cage length and drag coefficients of cages. The transport processes of pollutants inside aquaculture facilities are inhibited away from the vicinity of the culture cage area because of the reduction in tidal currents; therefore, the suspended cages significantly affect the transport processes of pollutants in coastal aquaculture waters. Furthermore, the reduction in the horizontal velocity can significantly decrease the food supply for aquaculture areas from the outside sea. The results of this study provide new insight into the planning of high-density suspended facilities for coastal aquaculture activities.

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Numerical investigation of flow with floating vegetation island

Cited by 25 publications

References 47 publications

Flow dynamics and sediment transport in vegetated rivers: A review

Flow dynamics and sediment transport in vegetated rivers: A review

Stochastic Simulation of the Suspended Sediment Deposition in the Channel With Vegetation and Its Relevance to Turbulent Kinetic Energy

Modeling the impact of culture facilities on hydrodynamic and solute transport in marine aquaculture waters of the North Yellow Sea

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