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"Revetments" of caged rip rap (stone) extend perpendicular to the shoreline here. By measuring the distance from this point to the shore on both the left (south) and right (north), you will be able to deduce the direction of longshore drift in this area. Check your answer by zooming in on this section of coast in Google Maps satellite view or Google Earth.
By the way, this GigaPan was shot from the top of this groin, with waves splashing around my feet and over the base of the tripod.
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