Beating off the waves – Sinking or migrating?

It opened up new views of the Maldives to me.  The story of how they were fighting off sea level rise was a familiar one to me – I even had worked on a project at university in the 1980s exploring the various options.  My solutions there had been rather clunky – using material from the inside of the atolls to build up the outside, more sea defences, different land uses.  Now I was here I could see that all of these had been tried and more.  But my view was that every island was the same and uniformly affected by sea level rise.  What I now saw was that while there was that inexorable pathway to submergence from sea level rise, the short term effects of that were affecting one side of the island more than the other.  Having a small amount of rise might not impact the coast, but if a storm came in, the accumulation of larger waves on top of an incremental change in normal levels could be devastating for a vulnerable coastline.  And that is what I had seen on the eastern side of the island.  When the sea is benign there is not issue, but if a storm hits serious erosion can happen overnight – especially if trees topple and the loss of roots shakes free lots of sand and soil.

But what appeared to be happening is the island is migrating.  Much of the material that was removed from the east was migrating round to the west, and the island is gently moving towards the centre of the atoll.

The long term dynamics must be more complicated that this and it might take many generations for the island to move a long way, but it was undeniable that most of the slack, the dune and the beach were relatively recent additions to the coral island.  The upshot is though that given the small size of these islands and some with a high population density, there is not enough room for leaving the usual setbacks that minimize damage to property in storms.

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Is the island stable, eroding or migrating?

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