Wave caused by the moon gravitational is huge, you have been to yearly event even at the River mouth here Sarawak and China which i am aware of. The tides affect the waves and current loads indirectly: through the variation of the level of the sea surface.
So there are two reason that tides happened. Firstly, astronomical tides is caused by the gravitational pull of the moon and sun. Secondly, the storm surge that cause by the combined wind and atmospheric pressure during a storm.
In platform design, the effect of current superimposed on waves are taken into account by adding the corresponding fluid velocity vertically. If you look at the formula, the drag forces is depend on the square of the velocity and this addition can greatly increase the force on platform.
So, also like the slender structure like flare tower which may be wind sensitive, we also have slender structure below the sea that is wave sensitive. So the phenomena called vortex shedding that caused cyclic loading should be investigated if your structure happened to be slender. From my observation cyclic loading if like what i saw at the SMTC when the tall grass swing back and forth. The mystery is vortex shedding.
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