Following Seas - Riding Down the Face of a Steep Wave

Following Seas - Riding on the Crest of a Steep Wave
Operating in following seas (waves on the stern) when riding on the crest of a steep wave can significantly reduce a fishing vessel’s stability by several actions. First, the critical stability supplied by the stern of the vessel is severely reduced when the stern is lifted clear of the water and no longer provides any righting forces. Second, the reduction in the vessel’s amidships freeboard further reduces the overall stability levels. This may lead to direct capsize of the vessel. Lastly, because the stern could be lifted clear of the water, the rudder may lose effectiveness, leading to the loss of steering control. This can lead to the danger of broaching and capsize. Recommendations In severe sea conditions, change course to put the bow into the seas. If the vessel must run with the seas, riding on the backside of the preceding wave minimizes the dangers.
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Following Seas - Riding in the Trough of a Steep Wave
Operating in following seas (waves on the stern) when riding in the trough of a steep wave can significantly reduce a fishing vessel’s stability without making the crew aware of the danger they are facing. The overall stability is reduced by several actions First, there is an increased chance of burying the bow in the backside of the preceding wave’s backside. This may cause the pilothouse windows to be blown out or lead to the vessel broaching and capsize. Second, there is an increased chance of being swamped by a boarding wave. The added weight of the water on deck raises the vessel’s center of gravity and creates a sizable free surface capsizing moment. Seepage Free Surface
- Water on Deck for details. Recommendations In severe sea conditions, change course to put the bow into the seas. If the vessel must run with the seas, riding on the backside of the preceding wave minimizes the dangers.
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