Which statement accurately describes the cyclic nature of parametric roll?

The cyclic nature of parametric roll is best captured by the statement that it may start and stop as conditions change. Parametric roll is a phenomenon that typically occurs when a ship is subjected to specific conditions of wave and speed, creating a resonance between the ship's natural roll frequency and the wave patterns. As those conditions fluctuate—such as alterations in the ship's speed or changes in wave height and direction—this rolling motion can initiate and subsequently dissipate, leading to a repeating or cyclic pattern.

This characteristic distinguishes parametric roll from other stability issues since it is not a singular event; instead, it is influenced by a dynamic interplay of external factors, meaning it can emerge, subside, and potentially re-emerge as external conditions fluctuate. Understanding this cyclical behavior is essential for mariners and naval architects, as it can impact the safety and stability of the vessel under varying operational scenarios.