New Zealand Journal of Marine and Freshwater Research abstracts

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Physical oceanography of Rangaunu Harbour, Northland, New Zealand

R. A. HEATH

B. S. SHAKESPEARE

M. J. N. GREIG

New Zealand Oceanographic Institute Division of Marine and Freshwater Science Department of Scientific and Industrial Research P.O. Box 12-346, Wellington North, New Zealand

Abstract Current meter, current drogue, salinity, temperature, and tidal elevation observations from Rangaunu Harbour are presented. The flow is dominated by the tides, the ebb tide in general being stronger than the flood. The time of high tide is increasingly delayed with distance from the open ocean. High tide at the head of the harbour lags about an hour behind that at the mouth. The phase of the flow relative to that of the elevation is less than that for a frictionless system. This difference from a quarter of a tidal period results from tidal energy dissipation and probably varies through the spring-neap tidal cycle. The outer harbour has essentially coastal water which is exchanged each tide. Residence time of the inner harbour waters and the inner harbour shallows (where evaporation is sufficient to raise the salinity) is several days.

Keywords Rangaunu Harbour; tides; salinity; tidal currents; friction; physical oceanography; sedimentation; temperature

New Zealand Journal of Marine and Freshwater Research, 1983, Vol. 17:481-493 0028-8330/83/1704-0481$2.50/0 © Crown copyright 1983 Received 4 November 1982

PDF file of entire paper: medium quality (791K); (scanned from paper original: notes about this process)

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