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Numerical modeling of aquaculture dissolved waste transport in a coastal embayment

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Abstract

Marine aquaculture is expanding rapidly without reliable quantification of effluents. The present study focuses on understanding the transport of dissolved wastes from aquaculture pens in near-coastal environments using the hydrodynamics code SUNTANS (Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier–Stokes Simulator), which employs unstructured grids to compute flows in the coastal ocean at very high resolution. Simulations of a pollutant concentration field (in time and space) as a function of the local environment (bathymetry), flow conditions (tides and wind-induced currents), and the location of the pens were performed to study their effects on the evolution of the waste plume. The presence of the fish farm pens cause partial blockage of the flow, leading to the deceleration of the approaching flow and formation of downstream wakes. Results of both the near-field area (area within 10 to 20 pen diameters of the fish-pen site) as well as far-field behavior of the pollutant field are presented. These detailed results highlight for the first time the importance of the wake vortex dynamics on the evolution of the near-field plume as well as the rotation of the earth on the far-field plume. The results provide an understanding of the impact of aquaculture fish-pens on coastal water quality.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO, 80523-1372, USA

    Subhas K. Venayagamoorthy & Hyeyun Ku

  2. Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, 94305, USA

    Oliver B. Fringer & Jeffrey R. Koseff

  3. Program on Food Security and the Environment, Stanford University, Stanford, CA, 94305, USA

    Alice Chiu & Rosamond L. Naylor

  4. Woods Institute for the Environment, Stanford University, Stanford, CA, 94305-4205, USA

    Oliver B. Fringer, Rosamond L. Naylor & Jeffrey R. Koseff

Authors
  1. Subhas K. Venayagamoorthy
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  2. Hyeyun Ku
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  3. Oliver B. Fringer
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  4. Alice Chiu
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  5. Rosamond L. Naylor
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  6. Jeffrey R. Koseff
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Correspondence to Subhas K. Venayagamoorthy.

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Venayagamoorthy, S.K., Ku, H., Fringer, O.B. et al. Numerical modeling of aquaculture dissolved waste transport in a coastal embayment. Environ Fluid Mech 11, 329–352 (2011). https://doi.org/10.1007/s10652-011-9209-0

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  • DOI: https://doi.org/10.1007/s10652-011-9209-0

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