B. T. Werner, P. K. Haff, R. P. Livi, R. S. Anderson; Measurement of eolian sand ripple cross-sectional shapes. Geology ; 14 (9): 743–745. doi: https://doi.org/10.1130/0091-7613(1986)14<743:MOESRC>2.0.CO;2
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Assuming that the profiles of eolian sand ripples remain constant over a short distance, it is possible to measure their shapes by casting a shadow perpendicular to the ripple crests. We describe a method whereby this can be done accurately and easily. Tests of the method demonstrate that accuracies on the order of one sand-grain diameter can be achieved.