Marine growth visually look like skin diseases on the jacket leg. Why do marine growth influence our structural analysis? Mainly because it become part of the structure, it directly increase the expose areas and volumes, but also the drag coefficient due to higher surface roughness. Besides that, it increase the gravity loads of structure.
Like the human demographic effect, tall people grew in Europe and shorty from Asia. The locations.
What do you know about tides? Like the G-shock surfman which can predict the sizes of wave and the phase of moon. From here, you can make a simple connection that tides are casued by the gravitional pull of the Moon and Sun. Besides the predictable monthly phenomenon, tides also can combined action of wind and barometer pressure differencee during storm.
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