Original Article

Environmental Fluid Mechanics

, Volume 11, Issue 4, pp 329-352

Numerical modeling of aquaculture dissolved waste transport in a coastal embayment

  • Subhas K. VenayagamoorthyAffiliated withDepartment of Civil and Environmental Engineering, Colorado State University Email author 
  • , Hyeyun KuAffiliated withDepartment of Civil and Environmental Engineering, Colorado State University
  • , Oliver B. FringerAffiliated withEnvironmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford UniversityWoods Institute for the Environment, Stanford University
  • , Alice ChiuAffiliated withProgram on Food Security and the Environment, Stanford University
  • , Rosamond L. NaylorAffiliated withProgram on Food Security and the Environment, Stanford UniversityWoods Institute for the Environment, Stanford University
  • , Jeffrey R. KoseffAffiliated withEnvironmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford UniversityWoods Institute for the Environment, Stanford University

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

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.

Keywords

Effluent pollution Dispersion Aquaculture Numerical modeling Plume dynamics Coastal engineering