I'm not familiar with the terminology of tides, so I can't address your second observation. As for the positions of the rocks, they are located there because the water is able to transport objects up there only during situations where the in which are really strong (e.g. storms) and are capable of moving large boulders. Smaller waves wash the sand around, and wash the sand down onto the beach because they don't reach up so high next to the cliffs. Offshore, the sand gives way to mud, where the energy of the water is even less.
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