A research vessel sits high and dry on the intertidal mudflats of the Manukau Harbour during low tide. The radar dish on top of the cabin detects the speed of the current in very shallow water. A narrow entrance with a huge basin can exaggerate the tides in enclosed areas such as this – Manukau Harbour has a 4-metre tidal range. Every six hours the harbour changes with the tide from a coastal inlet to a large mudflat crossed with river channels.
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NIWA – National Institute of Water and Atmospheric Research
Photograph by Craig Stevens
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