The north breakwater protecting the Nazaré harbor was severely damaged during the storms of the 2... more The north breakwater protecting the Nazaré harbor was severely damaged during the storms of the 2012-2013 and 2013-2014 winters, with the complete destruction of the structure´s head, and about 30m of its body. This structure is founded in a sandy foundation, and quite near of Nazaré canyon. The head and the immediate part of the breakwater body were protected with a double layer of 40 ton tetrapods on a layer of 5-12ton rock blocks. A topographic survey of the nearby sea floor showed a change in a secondary branch of the underwater canyon; which could justify the destruction of the breakwater head, as the original design considered a maximum wave 9 m high; a new analysis indicate a correct value for the design wave should be now 14 m. Consequently the rehabilitation design considered then a 14 m design wave, and the protection of the breakwater head was redefined as a double layer of 50 ton antifer blocks, with a density of 70%. The protection of the reconstructed body considered the recovering and reutilization of the 40 ton tetrapods that were recovered.
The north breakwater protecting the Nazaré harbor was severely damaged during the storms of the 2... more The north breakwater protecting the Nazaré harbor was severely damaged during the storms of the 2012-2013 and 2013-2014 winters, with the complete destruction of the structure´s head, and about 30m of its body. This structure is founded in a sandy foundation, and quite near of Nazaré canyon. The head and the immediate part of the breakwater body were protected with a double layer of 40 ton tetrapods on a layer of 5-12ton rock blocks. A topographic survey of the nearby sea floor showed a change in a secondary branch of the underwater canyon; which could justify the destruction of the breakwater head, as the original design considered a maximum wave 9 m high; a new analysis indicate a correct value for the design wave should be now 14 m. Consequently the rehabilitation design considered then a 14 m design wave, and the protection of the breakwater head was redefined as a double layer of 50 ton antifer blocks, with a density of 70%. The protection of the reconstructed body considered the recovering and reutilization of the 40 ton tetrapods that were recovered.
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