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Upper Darwin Harbour dye study, Palmerston outfall

Patterson, Ruth G. (2014). Upper Darwin Harbour dye study, Palmerston outfall. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Patterson, Ruth G.
Title Upper Darwin Harbour dye study, Palmerston outfall
Institution Charles Darwin University
Publication Date 2014
Thesis Type Bachelor of Engineering (4th Year Project)
Subjects 0905 - Civil Engineering
0999 - Other Engineering
Abstract Darwin Harbour is a macro-tidal estuary in the wet dry tropics of the Northern Territory, Australia. The population has been predicted to increase in the coming years due to a number of industrial developments in and around the harbour. This has increased pressure on the local utility to adequately define mixing zones around treated effluent outfalls in the harbour. Three out of four outfalls in Darwin Harbour flow through intertidal mangrove swamps before reaching a larger channel. The mangrove environment surrounding the waste water outfalls is thought to influence effluent mixing. To date it is unknown how well the Darwin Harbour numerical model simulates this process. The aim of this thesis is to gather and analyse data that describes the hydraulic connectivity of a mangrove swamp between an outfall and a larger channel using fluorescent FWT red dye. Dilution factors between 598 and 713 were determined where the mangrove zone meets the larger creek channel approximately 2 – 2.5 hours after the dye release. This thesis also describes the initial stages of developing a small scale model to simulate movement of the dye plume observed in the dye study. Several sensitivity analyses were undertaken using the RMA numerical model to test the effect of three different methods of wetting and drying on the water quality model. These results were used to define parameter values in the small scale model simulation of the dye injection. Results show that the model overestimates the size and residence time of the simulated dye study when using an element size of 100m and time step of 6 minutes. Physical characteristics determined by this study will underpin the future calibration of numerical models used to simulate regulatory mixing zones in mangrove environments.
Keyword Darwin Harbour
fluorescent dye
hydrodynamic model
estuarine mangrove dynamics
Resource Modelling Associates (RMA)
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Created: Tue, 30 Sep 2014, 09:26:07 CST by Jessie Ng