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It's probably too late for a managed retreat from Waikiki.
It's pretty easy to picture an artificial beach on an artificial lagoon, protected by a natural-stone look Disney designed concrete seawall someday.
Here's an article on Waikiki from CoastalCare.org:
Waikiki Beach Is Totally Man-Made And Disappearing. Can Hawaii Save It?
Most visitors may not know it, but Waikiki Beach is almost entirely man-made. It has had erosion problems since the late-1800s when developers began erecting hotels and homes too close to the natural shoreline and building seawalls and other structures that blocked the natural ebb and flow of sand along the beach.
By 1950, more than 80 structures, including seawalls, groins, piers and storm drains, were counted along the Waikiki shoreline.
Efforts to combat the resulting erosion have been haphazard, however, and with sea level rise now claiming about a foot of the beach a year, the threat of losing Waikiki Beach has become more dire…
http://coastalcare.org/2015/03/waikiki-beach-is-totally-man-made-and-disappearing-can-hawaii-save-it
Most visitors may not know it, but Waikiki Beach is almost entirely man-made. It has had erosion problems since the late-1800s when developers began erecting hotels and homes too close to the natural shoreline and building seawalls and other structures that blocked the natural ebb and flow of sand along the beach.
By 1950, more than 80 structures, including seawalls, groins, piers and storm drains, were counted along the Waikiki shoreline.
Efforts to combat the resulting erosion have been haphazard, however, and with sea level rise now claiming about a foot of the beach a year, the threat of losing Waikiki Beach has become more dire…
http://coastalcare.org/2015/03/waikiki-beach-is-totally-man-made-and-disappearing-can-hawaii-save-it
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