New Zealand Journal of Marine and Freshwater Research abstracts

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Circulation in the Hauraki Gulf, New Zealand

MALCOLM J.GREIG

New Zealand Oceanographic Institute Division of Water Sciences Department of Scientific and Industrial Research Private Bag, Kilbirnie, Wellington, New Zealand

Abstract Results from five current meters moored in Hauraki Gulf are analysed. Tidal flows and the tidal constituents M₂, S₂, and N₂ are deduced. Time series techniques are used to examine the effects of wind stress and the spatial coherence in the flow. It is found that currents of oceanic water, set up under south-west to southerly directed winds, flow into the Gulf through Jellicoe and Cradock Channels, with those through Cradock Channel probably passing more or less directly out through Colville Channel. A net anti-clockwise circulation is suggested to occur in the inner Gulf, south of the latitude of Kawau Island. A lack of any particular spectral features and limited spatial coherence suggests that in the Hauraki Gulf, variations in circulation in the 2- to 15-day time band considered are not well definedbutthattheGulf responds to external forcing events with transient currents which last typically from 2 to 5 days.

Keywords currents; circulation; tides; Hauraki Gulf

New Zealand Journal of Marine and Freshwater Research, 1990, Vol. 24: 141-150 Crown copyright 1990
Received 15 July 1988; accepted 11 September 1989

PDF file of entire paper: medium quality (649K); (scanned from paper original: notes about this process)

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