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Tidal
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Along eastern and western Australian shores there are two high tides and two low tides every 24+ hours. In southeastern Australia, the difference between high and low tide is up to 2 metres. In southwestern Australia, this difference is less than 1 metre. In northwestern Australia, there is a 7 metre tidal range at Broome. In South Australia the tides are more problematic. The tides of the Indian Ocean and the Pacific Ocean sometimes cancel each other out, so that there is only one high tide and one low tide every 24 hours. Occasionally, the water level remains stationary for days at a time in a "dodge tide". If this occurs in the searing summer months, all creatures and algae on the upper shore levels perish.
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ReferencesBennett, I. (1987) W. J. Dakin's classic study: Australian Seashores. p. 3-12, Angus & Robertson, Sydney. Davey, K. (1998) A Photographic Guide to Seashore Life of Australia. p.8, New Holland, Sydney. |
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Life
on Australian Seashores Scientific Consultant: Phil
Colman |