thames barrier
thames barrier 2
A seguito dell’alluvione del 1953, a barriera del Tamigi venne costruita (negli anni Ottanta) una difesa mobile contro le inondazioni situata sul fiume, a valle del centro di Londra. Attraversando una sezione trasversale del fiume larga 520 metri è la seconda barriera alluvionale mobile più lunga del mondo, dopo l’Oosterscheldekering olandese. Operativa dal1982, la barriera divide il canale fluviale in dieci porte di alluvione individuali. Quattro delle porte si trovano sopra il fiume e rendono non navigabili le sezioni esterne, mentre le sei porte più grandi e centrali del settore ascendente sono sul letto del fiume e vengono sollevate solo quando si prevede una marea eccezionale, permettendo al traffico fluviale di passare senza ostacoli.

THAMES BARRIER #BBCmagazine #RoyalGeograficalSociety #Designbuildings  #tempodacqua #thetimeofwater

The Thames Barrier is a moveable flood defense located on the River Thames, downstream of central London. Spanning a cross section of the river 520 meters wide, the barrier is the second longest movable flood barrier in the world, after the Netherlands’ Oosterscheldekering. Operational since 1982, the barrier divides the river channel into ten individual flood gates. Four of the gates sit above the river and make the outer sections non-navigable, whilst the six larger, central rising sector gates lie flat on the river bed and are only raised when an exceptional tide is expected, allowing river traffic to pass unimpeded.

It was the catastrophic North Sea Flood of late January 1953 that caused over 300 deaths in the UK that eventually led to the barrier’s construction. Although London was largely spared from the flooding, the scale of the devastation elsewhere in the country led to a renewed assessment of London’s vulnerability to flood. A committee who reviewed the floods recommended that investigations into the possibility of a barrier be undertaken. However, it wasn’t until a further review by Sir Herman Bondi in 1967, itself triggered by the devastating floods in Hamburg in 1962, that serious progress on the proposal happened. The Thames Barrier Act was finally passed in 1972.