The lunar terdiurnal ocean tide has a period of approximately 8.2804 hours, and theoretically has a small amplitude. Its largest equilibrium action term is just 2.56 mm, generally considered to have little impact on shipping or other maritime activities. Thus, it has not received much attention in previous studies, and understanding of the M3 tide’s characteristics in various global regions is extremely limited.
Click here for original story, Multi-regional observations and validation of the M₃ ocean tide
Source: Phys.org