2003•Coasts & Ports 2003 Australasian Conference : Proceedings of the 16th Australasian Coastal and Ocean Engineering Conference, the 9th Australasian Port and Harbour Conference and the Annual New Zealand Coastal Society ConferenceRequires access
Oceanographic Modelling of Ocean Outfall Options: Canterbury Region, South Island, New Zealand
Deborah R Cox
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Abstract
Oceanographic data collection and 3D numerical modelling are being undertaken to assist in the design and evaluation of ocean outfall options at two locations in Pegasus Bay on the Canterbury coast near Christchurch. Analysis of offshore current data in the region has shown that, in addition to tidal and local wind-driven currents, there is a significant low-frequency longshore current which had not previously been observed in the study area. This longshore current was shown to contribute significantly to the flushing of the coastal area, and the hydrodynamic model was thus configured to allow the simulation of currents due to the combination of tides, local winds and low frequency longshore currents at the proposed outfall sites. Long-term dynamic modelling of the effluent plumes from a number of outfall options is being undertaken to allow the water quality impacts to be quantified near each site.