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    Wind and buoyancy driven horizontal exchange in shallow embayments of a tropical reservoir: Lake Argyle, Western Australia

    Access Status
    Fulltext not available
    Authors
    Woodward, B.
    Marti, Clelia
    Imberger, J.
    Hipsey, M.
    Oldham, C.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Woodward, B. and Marti, C. and Imberger, J. and Hipsey, M. and Oldham, C. 2017. Wind and buoyancy driven horizontal exchange in shallow embayments of a tropical reservoir: Lake Argyle, Western Australia. Limnology and Oceanography. 62 (4): pp. 1636-1657.
    Source Title
    Limnology and Oceanography
    DOI
    10.1002/lno.10522
    ISSN
    1939-5590
    School
    Sustainable Engineering Group
    URI
    http://hdl.handle.net/20.500.11937/65560
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Association for the Sciences of Limnology and Oceanography Many factors including depth, vegetation density, wind, and gyres may act to influence the littoral exchange in a water body but very few studies have investigated the interaction between more than two of these factors at any time. To investigate these controls on horizontal exchange in a large tropical reservoir, we conducted a 9-d intensive field experiment in Lake Argyle, Western Australia. The experiment began with a 7-d cooling period that generated water in the shallows of the reservoir embayments that was persistently cooler than the interior. This led to an underflow of dense water that moved from the lake boundary toward the center of the reservoir. A three-dimensional hydrodynamic model (ELCOM) was able to adequately reproduce this thermal structure and was used to demonstrate its sensitivity to wind-sheltering effects and submerged macrophyte presence. Further analysis of the predictions indicated that when the ratio of the shear and buoyancy force, averaged over 6 h (B 6h ) and 6-h averaged wind speed in the direction of the embayment (U 6h ) was (1) greater than 0.5 ms -1 and 4.5 ms -1 respectively, the exchange was dominated by a topographic gyre formation, (2) when 0.1 < B 6h < 0.5 and 2.4 ms -1 < U 6h < 4.5 ms -1 , the resulting circulation was a combination of differential cooling flows and a topographic gyre circulation, and (3) when U 6h fell below 2.4 ms -1 , purely buoyancy driven flow occurred but only if the buoyancy forces across the embayments were an order of magnitude greater than wind-induced velocity shear.

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