Simulating particle organic matter dispersal beneath Atlantic salmon fish farms using different resuspension approaches

MARINE POLLUTION BULLETIN

卷:161

Article

Carvajalino-Fernandez, M. A.^1,2  Saevik, P. N.¹  Johnsen, I. A.¹  Albretsen, J.¹  Keeley, N. B.¹ 

[1] Inst Marine Res, Postboks 1870 Nordnes, N-5817 Bergen, Norway

[2] Univ Bergen, Inst Geophys, Allegaten 70, N-5020 Bergen, Norway

关键词: Aquaculture;    Resuspension;    Parametrization;    Lagrangian model;    Substrate;   

DOI  :  10.1016/j.marpolbul.2020.111685

来源: Elsevier

【 摘 要 】

An accurate representation of the particle organic matter (POM) footprint is necessary in order to effectively predict impacts upon benthic communities and the risk of excessive organic enrichment beneath aquaculture sea-cages. Consequently, bottom-related processes such as particle resuspension must be adequately parametrized and evaluated in the available numerical models. We implemented two approaches to model POM resuspension in a Lagrangian particle tracking model and compared their influence on footprint extension and gradients of depositional flux against a no-resuspension scenario. We performed simulations in both exposed and protected aquaculture locations, and at different stages of the Atlantic Salmon (Salmo salar) production cycle in Norway. Our results indicate that the use of sediment-dependent thresholds for resuspension has the potential to regulate the high levels of erosion produced when selecting a low critical value in constant-threshold approaches, particularly in dynamic environments with mixed sediment types.

【 授权许可】

Free