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- W2973014805 abstract "The Brisbane River Estuary facilitated European settlement of the surrounding region. As the estuary was progressively engineered to facilitate economic growth, its behaviour, character and colour changed. Today the estuary no longer serves as the backbone of Brisbane’s economy, providing no natural resources nor passage to large vessels beyond the central business district. This is unusual for an estuary flowing through a capital city. Whilst other cities around the world continue to engineer their estuaries to support their respective economies, Brisbane has the relatively uninhibited opportunity to improve its estuary’s ecological potential and appeal.The turbidity of the Brisbane River Estuary is cyclic, with both tidal and annual components. The first of two primary challenges addressed in this study was to determine the processes responsible for the annual component. The work involved the analysis of existing measurements, the development of processed based numerical models and additional field monitoring.The annual component in the estuary’s turbidity cycle is principally driven by exchanges of mud between the channel and mudbanks. From around May to August the winds are sufficiently calm and thus the waves are sufficiently small that mud in suspension can settle onto the mudbanks. As the mud is progressively transferred to the mudbanks, the channel bed is progressively depleted of erodible mud. Thus, the tidal currents progressively erode less mud into suspension and the turbidity decreases. From around September to April the winds are sufficiently energetic and thus the waves are sufficiently large that the mud temporarily stored in the mudbanks is eroded and reintroduced to the channel bed. The reintroduced mud is readily eroded by the tidal currents and contributes to the turbidity of the estuary.The second challenge was to determine a means to enhance the Brisbane River Estuary’s existing capacity to reduce its turbidity and formulate a strategy to further reduce the turbidity. Experiments on native vegetation already existing on the mudbanks of the estuary have demonstrated that one species, Crinum pedunculatum, is readily propagated, survives below mean water level and is of a physical form conducive to intercepting waves. The mass planting of C. pedunculatum in a line parallel to the channel and below mean water level will intercept the waves and maintain “calm wind” conditions over the mudbanks year-round. Thus the turbidity will be maintained around the low August levels, or lower, for longer." @default.
- W2973014805 created "2019-09-19" @default.
- W2973014805 creator A5032921394 @default.
- W2973014805 date "2019-08-23" @default.
- W2973014805 modified "2023-09-27" @default.
- W2973014805 title "Reducing the turbidity of the Brisbane River Estuary, Australia" @default.
- W2973014805 doi "https://doi.org/10.14264/uql.2019.686" @default.
- W2973014805 hasPublicationYear "2019" @default.
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