Abstract:
In 2005 the Coastal Receiving Environment Assessment (CREA) project was carried out to model the likely deposition of sediment and zinc from stormwater and wastewater in the Auckland City coastal environment over the next 150 years (Croucher et al., 2005). More recently, the CREA models were recalibrated to take into account revised estimates of contaminant loads and additional ¯eld data (Croucher et al., 2009). This report describes the use of the recalibrated CREA models to make updated predic- tions of future coastal benthic zinc concentrations, under a range of possible load scenarios. The original CREA modelling (Croucher et al., 2005) also included predictions of future zinc concentrations, but only under a set of very simple load scenarios (with loads held constant in time). Subsequently, future predictions of zinc concentrations were made for Tamaki Estuary (Croucher et al., 2007) using some more realistic load scenarios. The current work uses the same methodology employed for the previous predictions, but uses the recalibrated CREA models and a new set of load scenarios.