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Effects of waves and currents on gravity-type cages in the open sea

Authors
Journal
Aquacultural Engineering
0144-8609
Publisher
Elsevier
Publication Date
Volume
38
Issue
2
Identifiers
DOI: 10.1016/j.aquaeng.2008.01.003
Keywords
  • Net Cage
  • Oblique Waves And Currents
  • Mooring Line Tension
  • Volume Reduction Coefficient
Disciplines
  • Computer Science

Abstract

Abstract The effects of waves with a uniform current on marine aquaculture gravity-type cages were analyzed using a numerical model previously validated by physical model tests. The present analysis employs a numerical algorithm to study the dynamic behaviors of the net-cage system when impinged upon by surface waves from various angles over a uniform current. The maximum tension of the mooring lines and the minimum volume reduction coefficients of the rearing system were analyzed. We found that the current-induced effects on the net-cage system were more important than those due to waves only. We conclude that farming sites should not be situated in areas where the current speed exceeds 1 m/s, unless technological devices are available to overcome serious net-cage volume deformation. Furthermore, we recommend that, whenever possible, the combined effects of various oblique waves and currents be carefully examined before a system is installed. Finally, the ideal range of water depth for net-cage implementation in the open sea is between 30 and 50 m.

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