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  • Numerical Study of the Hydrodynamics of a Very Shallow Estuarine System - Coombabah Lake, Gold Coast, Australia

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    Author(s)
    Ali, A
    Zhang, H
    Lemckert, CJ
    Griffith University Author(s)
    Lemckert, Charles J.
    Zhang, Hong
    Ali, Ayub
    Year published
    2009
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    Abstract
    Coastal wetlands and estuaries are important environments providing significant habitats for flora and fauna species - often supporting commercial and recreational fisheries. These systems also act as filters for contaminants and sediments, and the absorption of wave energy. As a consequence of the ecological significance and the potential for anthropogenic disturbances and inputs into Coombabah Lake estuary (Australia), the lake and surrounding wetlands have been the focus of recent scientific study efforts. This estuarine lake (~2 km2 in size) is a very shallow (mean depth < 1 m) estuarine system that experiences a tidal ...
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    Coastal wetlands and estuaries are important environments providing significant habitats for flora and fauna species - often supporting commercial and recreational fisheries. These systems also act as filters for contaminants and sediments, and the absorption of wave energy. As a consequence of the ecological significance and the potential for anthropogenic disturbances and inputs into Coombabah Lake estuary (Australia), the lake and surrounding wetlands have been the focus of recent scientific study efforts. This estuarine lake (~2 km2 in size) is a very shallow (mean depth < 1 m) estuarine system that experiences a tidal range of 1.2 m, thus resulting in the continual exposure of large mud flats at low tide. Variations in water column physio-chemical and biological parameters and nutrient concentrations of the benthic sediments have previously been attributed to the hydrodynamic regime, hydrologic events, and sediment sources. In this study, a three-dimensional (3D) hydrodynamic model with unstructured mesh is setup to simulate the hydrodynamic regime and Bottom Boundary Layer (BBL) properties. In particular, the sensitivity of calibration parameters for a very shallow estuarine model is investigated. Model results are verified by recent intensive measurements. The hydrodynamic regime of the lake was found to be favorable for settlement of suspended sediments. The results reveal the necessity to correctly measure and use the appropriate bathymetry and bed roughness conditions in the numerical scheme for very shallow environments.
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    Journal Title
    Journal of Coastal Research
    Volume
    SI 56
    Publisher URI
    http://www.cerf-jcr.org/index.php/international-coastal-symposium/ics-2009portugal
    Copyright Statement
    © 2009 CERF. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Earth sciences
    Engineering
    Water resources engineering
    Publication URI
    http://hdl.handle.net/10072/25964
    Collection
    • Journal articles

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