Thames River Barrier, closed to protect London from flooding

London, UK
Thames River Barrier, closed to protect London from flooding, but with central gates lifted higher to allow "underspill"which equalizes upstream and downstream water levels more quickly and scours silt from the door sills.
After the North Sea flood of 1953, consensus to develop protection for the City of London, which has had a flooding problem since its inception, led to the design and construction of the Thames Barrier, at a cost of £534 million (£1.6 billion in 2016).
The barrier seems to work well, and, though it is being used more than expected, plans for a larger defense structure are delayed.
Scientific projections of ocean rise are changing daily as the current data indicates that ice melt is accelerating geometrically. Conservative estimates are for at least a meter of ocean rise by the end of the century, which puts large sections of almost all coastal cities under water. Do we just move back from the coast, as Indonesia is doing with Jakarta, or do we build sea walls, which will be only a temporary prophylactic?

So many thanks to the late Chris Puddy for these flights. He will be missed