In the case of Abbot Point, dredging will be used to expand what is essentially a simple jetty jutting out into the sea into one of the world’s largest coal ports. The debris collected is usually a mixture of sand, mud and rock. Sometimes the sediment from dredging is used to “renourish” onshore areas, such as coastal areas subject to erosion. Large vessels require water of a certain depth to access these routes, so dredging is used to ensure they don’t run aground. Various Australian waters have been dredged in the past, most notably Port Phillip Bay, overlooked by Melbourne, and, more recently, locations off the Queensland coast such as Gladstone harbour.ĭredging is mainly used to either maintain the depth of ports or create new shipping channels.
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