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. 2015 Mar 25;10(3):e0121278. doi: 10.1371/journal.pone.0121278

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© 2015 McNamara et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — Contours for the optimal time in years between nourishment events plotted against the mean background erosion rate (m/yr) and the mean number of storms per year. Historically, the background erosion rate for North Carolina is near 1 m/yr (21). The return period for hurricanes in this region ranges between 8 and 20 years (22).