Dunes aren't seawalls but they do tend to protect development, and once they're there if they have enough room they will self-replicate or maintain. If you build right up against the dunes they will move inward and affect buildings, so setbacks and stilts still have to be part of the discussion or it won't be sustainable for the long haul.
After Hurricane Sandy, Dunes Prove They Blunt Storms - NYTimes.com:
'via Blog this'
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