SS3.19 Role of Benthic Communities in the Cycling and Balance of Nitrogen in Bays and Estuaries
Date: Friday, June 14, 2002
Time: 9:30:00 AM
Location: Oak Bay
 
RobsonBJ, Centre for Water Research, University of Western Australia, Perth, Australia, robson@cwr.uwa.edu.au
Hamilton, D, P, Centre for Water Research, University of Western Australia, Perth, Australia, hamilton@cwr.uwa.edu.au
Chan, T, U, Centre for Water Research, University of Western Australia, Perth, Australia, chan@cwr.uwa.edu.au
 
NUTRIENT DYNAMICS OF THE SWAN RIVER ESTUARY: MODELING THE EFFECT OF INTERANNUAL VARIATIONS IN RIVER INFLOW
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The Swan River Estuary is characterised by large seasonal and interannual variations in freshwater inflow and hence the extent of saline intrusion. Meteorological, hydrological and water quality data for tributaries to the estuary were used together with data from the literature on parameters relating to nutrient transformations and phytoplankton physiology to provide input to a coupled three-dimensional hydrodynamic-ecological numerical model. The model simulates hydrodynamic processes within the Swan River Estuary as well as nutrient, dissolved oxygen and phytoplankton concentrations. This model was calibrated against a comprehensive set of measured environmental data for the period of January to December 1995 and validated by comparison of model results with measured data for 1998. The model was then used to compare the nutrient budget of the estuary in a wet year with the budget in a dry year. The results are discussed in terms of implications for management.