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  • Wind forced circulation and sediment disturbance in a temperate lake

    Author(s)
    Gibbs, M
    Abell, J
    Hamilton, D
    Griffith University Author(s)
    Hamilton, David P.
    Year published
    2016
    Metadata
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    Abstract
    Meteorological forcing on the surface of a lake can generate mixing and transport processes that alter water quality. This study examined how meteorological forcing affected water currents in Lake Rotorua—a large, shallow, temperate, polymictic lake—during a period of sustained vertical mixing and strong winds. Acoustic Doppler current profiler (ADCP) measurements were recorded at two sites and a hydrodynamic model (ELCOM) was used to simulate water movement over the period of ADCP measurements. Model simulations show circulation patterns in Lake Rotorua are strongly influenced by the topography of the lake and, to a lesser ...
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    Meteorological forcing on the surface of a lake can generate mixing and transport processes that alter water quality. This study examined how meteorological forcing affected water currents in Lake Rotorua—a large, shallow, temperate, polymictic lake—during a period of sustained vertical mixing and strong winds. Acoustic Doppler current profiler (ADCP) measurements were recorded at two sites and a hydrodynamic model (ELCOM) was used to simulate water movement over the period of ADCP measurements. Model simulations show circulation patterns in Lake Rotorua are strongly influenced by the topography of the lake and, to a lesser extent, the catchment, with little variation in currents with depth during winter mixing. Northeasterly winds produced a clockwise circulation around the mid-lake island with a second anticlockwise gyre between the island and the western shore. This circulation pattern is consistent with topographic gyres found in other large lakes. A shift to a weaker southwesterly wind caused these circulation patterns to reverse direction over a period of c. 6 h, with a weak secondary gyre also occurring within the main anticlockwise circulation. The effect of this circulation pattern on the resuspension of sediment and thus potential in-lake phosphorus control strategies is considered.
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    Journal Title
    New Zealand Journal of Marine and Freshwater Research
    Volume
    50
    Issue
    2
    DOI
    https://doi.org/10.1080/00288330.2015.1116998
    Subject
    Earth sciences
    Physical geography and environmental geoscience not elsewhere classified
    Environmental sciences
    Biological sciences
    Publication URI
    http://hdl.handle.net/10072/336696
    Collection
    • Journal articles

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