The Earth's rotation, combined with gravitational forces from the moon and the sun, combine to cause sea levels to rise and fall daily. The effects of these high and low tides can often be dramatic. In today's image we can see not only the effect of a low tide but also evidence of a rain deficit. It seemed that everywhere I went in Hilton Head(the tennis shoe-shaped island) you could see exposed areas that are normally covered with water.
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A look beneath the pier shows the high-water mark on the sea wall, lined with barnacles, shells and other crustacea. Notice how far down the pier posts the entire dock system is positioned.
Nonetheless, I found this particular scene worthy of a mid-day exposure.
I spent a week in this area and the water levels never showed any significant change, causing me to wonder if the area was under a severe rain deficit. Sea levels in the area seem to be down some 12 to 15 feet.