Tregenna Stream? Porthminster Beach, St.Ives, Cornwall. U.K Today 3rd April 2018.pic.twitter.com/sEgly7fqF0
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It's an interesting question - I suspect it's just the nature of the landscape: I shared a pic from the 1950s a little while back of Porthmeor showing them having demolish the sandhills that had built up against the L18thC sea-wall with bulldozers, so still a potential issue!