High-resolution computational fluid dynamics modelling of suspended shellfish structures
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Aquaculture structures are responsible for flow disturbances that extend over a large range of scales. In the case of shellfish aquaculture, those scales extend from the size of an individual shellfish to the size of a whole farm with intermediate scales being the size of a shellfish structure or of a block of shellfish structures. The influence of block spacing and angle is investigated by the mean of a 2D high resolution computational fluid dynamics model. Block angle is found to be the main relevant parameter controlling to a large extent the mixing generated by the shellfish structures. Strong sensitivity is found for small angles. Nevertheless, it is shown that for a limited number of blocks, upstream turbulence still dominates the degree of the total mixing within the farm, and that total flow reduction is little affected by the orientation of the blocks. A simple analytical model is presented that predicts most of the numerical results.
KeywordsMusselfarm Long-lines Drag Mixing 2D turbulence Computational fluid dynamics
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- 1.Blanco J, Zapata M, Morono A (1996) Some aspects of the water flow through mussel rafts. Scientia Marina 60(2–3): 275–282Google Scholar
- 2.Boyd AJ, Heasman KG (1998) Shellfish mariculture in the benguela system: water flow patterns within a mussel farm in Saldanha Bay, South Africa. J Shell Res 17(1): 25–32Google Scholar
- 16.Plew DR (2005) The hydrodynamic effects of long-line mussel farms. PhD Thesis, Department of Civil Engineering, University of Canterbury. digital-library.canterbury.ac.nz/data/collection3/etd/adt%2DNZCU20060106.144622Google Scholar
- 17.Plew DR (2009) Drag coefficients for modelling flow through suspended canopies. J Marine Ecol (submitted)Google Scholar
- 18.Plew DR, Enright MP, Nokes RI, Dumas JK (2009) Effect of mussel bio-pumping on the drag on and flow around a mussel crop rope. Aqua Eng 40: 51–61Google Scholar
- 20.Popinet S, Smith M, Stevens CL (2004) Experimental and numerical study of the turbulence characteristics of air flow around a research vessel. J Ocean Atmos Technol 21(10): 1574–1589Google Scholar
- 22.Seymour RJ, Hanes DM (1979) Performance analysis of tethered float breakwaters. J Waterway Port Coast Ocean Eng 105(3): 265–280Google Scholar
- 23.Stevens C, Smith M, Gorman R, Popinet S, Walters R (2007) Marine renewable energy research in New Zealand: a multi-scale perspective of resources and impacts. In: Australian coasts and ports conference, Melbourne, AustraliaGoogle Scholar
- 24.Stevens CL (2003) Turbulence in an estuarine embayment: observations from Beatrix Bay, New Zealand. J Geophys Res 108. doi: 10.1029/2001JC001221