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Li Huang
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China

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Journal article
Published: 25 January 2021 in Water
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Cage-based aquaculture has been growing rapidly in recent years. In some locations, cage-based aquaculture has resulted in the clustering of large quantities of cages in fish farms located in inland lakes or reservoirs and coastal embayments or fjords, significantly affecting flow and mass transport in the surrounding waters. Existing studies have focused primarily on the macro-scale flow blockage effects of fish cages, and the complex wake flow and associated near-field mass transport in the presence of the cages remain largely unclear. As a first step toward resolving this knowledge gap, this study employed the combined Particle Image Velocimetry and Planar Laser Induced Fluorescence (PIV-PLIF) flow imaging technique to measure turbulence characteristics and associated mass transport in the near wake of a steady current through an aquaculture cage net panel in parametric flume experiments. In the near-wake region, defined as ~3M (mesh size) downstream of the net, the flow turbulence was observed to be highly inhomogeneous and anisotropic in nature. Further downstream, the turbulent intensity followed a power-law decay after the turbulence production region, albeit with a decay exponent much smaller than reported values for analogous grid-generated turbulence. Overall, the presence of the net panel slightly enhanced the lateral spreading of the scalar plume, but the lateral distribution of the scalar concentration, concentration fluctuation and transverse turbulent scalar flux exhibited self-similarity from the near-wake region where the flow was still strongly inhomogeneous. The apparent turbulent diffusivity estimated from the gross plume parameters was found to be in reasonable agreement with the Taylor diffusivity calculated as the product of the transverse velocity fluctuation and integral length scale, even when the plume development was still transitioning from a turbulent-convective to turbulent-diffusive regime. The findings of this study provide references to the near-field scalar transport of fish cages, which has important implications in the assessment of the environmental impacts and environmental carrying capacity of cage-based aquaculture.

ACS Style

Dongdong Shao; Li Huang; Ruo-Qian Wang; Carlo Gualtieri; Alan Cuthbertson. Flow Turbulence Characteristics and Mass Transport in the Near-Wake Region of an Aquaculture Cage Net Panel. Water 2021, 13, 294 .

AMA Style

Dongdong Shao, Li Huang, Ruo-Qian Wang, Carlo Gualtieri, Alan Cuthbertson. Flow Turbulence Characteristics and Mass Transport in the Near-Wake Region of an Aquaculture Cage Net Panel. Water. 2021; 13 (3):294.

Chicago/Turabian Style

Dongdong Shao; Li Huang; Ruo-Qian Wang; Carlo Gualtieri; Alan Cuthbertson. 2021. "Flow Turbulence Characteristics and Mass Transport in the Near-Wake Region of an Aquaculture Cage Net Panel." Water 13, no. 3: 294.

Conference paper
Published: 04 December 2017 in International Low Impact Development Conference China 2016
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This article takes Beijing as the representative research city, analyzes current laws and regulations about urban rainwater. It puts forward seven basic factors of rainwater storage and infiltration and works out the “4+1” comprehensive control index system of rainwater which consists of 4 indexes of rainwater and 1 index of sediment removal. Moreover, based on city planning and urban water and soil conservation of Beijing, the “3-5-7-9” comprehensive index system of rainwater had been built. Some application cases of the Beijing economic-technological development area are presented to demonstrate the features and functions of “infiltration-storage-utilization-drain” rainwater system, which based on the “3-5-7-9” series of rainwater controlling index system. The studies not only have a great significance of strengthening the city flood prevention and control in northern city, but also promote the development of urban LID technology.

ACS Style

Anping Shu; Xing Zhou; Donglian Kong; Lu Tian; Li Huang. Index System of Urban Rainwater Collection and Utilization in Beijing City under Low Impact Development. International Low Impact Development Conference China 2016 2017, 1 .

AMA Style

Anping Shu, Xing Zhou, Donglian Kong, Lu Tian, Li Huang. Index System of Urban Rainwater Collection and Utilization in Beijing City under Low Impact Development. International Low Impact Development Conference China 2016. 2017; ():1.

Chicago/Turabian Style

Anping Shu; Xing Zhou; Donglian Kong; Lu Tian; Li Huang. 2017. "Index System of Urban Rainwater Collection and Utilization in Beijing City under Low Impact Development." International Low Impact Development Conference China 2016 , no. : 1.