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Numerical simulation of flow and aquaculture organic waste dispersion in a curved channel

Abstract

The dispersion and deposition of particulate organic matter from a fish cage located in an idealized curved channel with a 90° bend are studied for different horizontal grid resolutions. The model system consists of a three-dimensional, random-walk particle tracking model coupled to a terrain-following ocean model. The particle tracking model is a Lagrangian particle tracking simulator which uses the local flow field, simulated by the ocean model, for advection of the particles and random walk to simulate the turbulent diffusion. The sinking of particles is modeled by imposing an individual particle settling velocity. As the homogeneous water flows through the bend in the channel, the results show that a cross-channel secondary circulation is developed. The motion of this flow is similar to a helical motion where the water in the upper layers moves towards the outer bank and towards the inner bank in the lower layers. The intensity of the secondary circulation will depend on the viscosity scheme and increases as the horizontal grid resolution decreases which significantly affects the distribution of the particles on the seabed. The presence of the secondary circulation leads to that most of the particles that settle, settle close to the inner bank of the channel.

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Acknowledgments

This research has received support from The Research Council of Norway through NFR 190474/s40 (ECORAIS). The authors would also like to thank the two anonymous reviewers for constructive comments that have improved the manuscript.

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Correspondence to Alfatih Ali or Jarle Berntsen.

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Responsible Editor: Martin Verlaan

This article is part of the Topical Collection on the 16th biennial workshop of the Joint Numerical Sea Modelling Group (JONSMOD) in Brest, France 21–23 May 2012

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Ali, A., Thiem, Ø. & Berntsen, J. Numerical simulation of flow and aquaculture organic waste dispersion in a curved channel. Ocean Dynamics 63, 1073–1082 (2013). https://doi.org/10.1007/s10236-013-0638-9

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  • DOI: https://doi.org/10.1007/s10236-013-0638-9

Keywords

  • Fish farm waste
  • Curved channel flow
  • Hydrodynamic modeling
  • Particle tracking model