Story: Ocean currents and tides

Sediment plume

Sediment plume

The oceans are not well mixed. Bodies of water have different temperatures, salinity and clarity, and often do not mingle, but lie on top of one another. The plume of sediment in this photograph is flowing from the Waimakariri River into Pegasus Bay, north of Christchurch. The fresh water from the river mouth floats out on top of the denser sea water.

Using this item

NIWA – National Institute of Water and Atmospheric Research
Photograph by Rob Bell

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How to cite this page:

Craig Stevens and Stephen Chiswell, 'Ocean currents and tides - Fiords, estuaries and river plumes', Te Ara - the Encyclopedia of New Zealand, (accessed 8 August 2022)

Story by Craig Stevens and Stephen Chiswell, published 12 Jun 2006