Abstract
Variation in particle size on the beach and windward slope of Europe's largest coastal dune—the dune du Pilat, southwest France—is studied by means of the log-hyperbolic distribution. Grain size tends to coarsen up the dune as a result of progressive deflation of fines. The dune sands are well-sorted but there is no significant spatial variation in τ 2. Twenty-one out of twenty-five sand samples have positive π values (negative phi skewness) and there is a weak but significant decline in π towards the beach. Dune sub-environments could not be detected using the hyperbolic shape triangle.
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