<p>The purpose of this paper is to study the successive mooring lines failure (also known as the domino effect) and the collision between floating collars for aquaculture net cages subjected to currents. The numerical model of this study is developed based on Morison's empirical formula and the lumped-mass scheme in the time domain. Under four different current velocities (0.5, 1.0, 1.5, 2.0 m/s) and three different safety factors (SF, 1.0, 1.5, 2.0) settings, to see if the failure of anchorage point #1 on the upstream side will trigger the domino effect, to calculate the number of mooring failures, and to determine whether it will cause floating collars collision. The results show that in the case of the SF is 2.0, the domino effect will not be triggered, and the floating collar collision will not occur. When the SF is 1.5, and the flow velocity is up to 1.0 m/s or higher, only the two anchor points on the upstream side will fail and no collision will occur. However, if the SF is not considered (that is, 1.0), the domino effect will occur under all the four velocities, and the floating collar collision will all occur. Therefore, this study suggests that in order to avoid the domino effect of the mooring system of aquaculture net cages from currents, the SF of the mooring system design must be at least 2 times.</p>

Hydrodynamic Behaviors of Aquaculture Net Cages After the Successive Mooring Lines Failure

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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