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Most of the world's shorelines are in a state of erosion, prompting the search for ways to predict the future rate of shoreline retreat. In their Perspective, Pilkey and Cooper1 claim that a simple mathematical relationship called the Bruun rule is not a suitable means for calculating shoreline retreat except under a limited range of environmental circumstances. 1: http://www.sciencemag.org/cgi/content/full/303/5665/1781
Pilkey et al. (Fri,) studied this question.
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