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Gold Coast Seaway
The Gold Coast Seaway or Southport Seaway is the main navigation entrance from the Pacific Ocean into the Gold Coast Broadwater and southern Moreton Bay and is one of Australia’s most significant coastal engineering projects. It is located at the northern end of the Southport Spit where the Nerang River enters the Pacific Ocean. Across from the spit is Porpoise Spit on South Stradbroke Island.
The channel was constructed between 1984 and 1986, primarily to facilitate the safe passage of sea-faring vessels. The passage was previously known as the Southport Bar. The mouth of the Nerang River was once located further south in Broadbeach. The main driving force for this movement is the northward drift of sand along the coast. This northward drift was responsible for the unstable and shifting conditions of the bar, which made crossing it so hazardous for small boats. The southern training wall of the Gold Coast Seaway is the northern end of the Gold Coast Oceanway.
==Design==
Two rock walls to stabilise the position of the entrance were constructed. To reduce the entry of ocean swells the breakwater walls were aligned 15 degrees north of east and increasing the length of the southern wall.〔 Models indicated that the western shores of the Broadwater would need further protection from waves. Wave Break Island was constructed from dredged material to act as a barrier.
The channel is 250 metres wide. The mean depth is 11 m〔 and it has a maximum depth of 20 m.〔(【引用サイトリンク】title=Gold Coast Seaway: a marine lovers’ paradise )〕 During outgoing tides, excess treated wastewater from four sewage treatment plants is released into the channel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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