Physical Properties of Turbulent Benthic Boundary Layers Generated by Internal Waves |
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Authors: | Charles Lemckert Jason Antenucci Angelo Saggio Jorg Imberger |
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Affiliation: | 1School of Engineering, Griffith Univ. Gold Coast Campus, PMB50, Gold Coast Mail Centre, Queensland 9726, Australia. 2Centre for Water Research, Univ. of Western Australia, Nedlands, W.A. 6217, Australia. 3Present Address: Alameda das Rosas, 295, Sao Carlos, SP 13566-560, Brazil.
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Abstract: | Physical properties of active turbulent benthic boundary layers (TBBL) generated by basin scale internal waves were studied within a Northern hemisphere thermally stratified lake. A microstructure profiler was used to measure the nature of the turbulence within the TBBLs while a series of thermistor chains were used to monitor the thermal structure of the lake. It was observed that a wind-driven anticlockwise diurnal-period vertical mode one Kelvin wave generated large scale motions within the water column, and that the interactions between this wave and the sloping lakebed induced TBBLs. A simple model, based on potential energy change and boundary shearing, was shown to describe the mean TBBL thickness. |
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Keywords: | Turbulent boundary layers Lakes Thermal factors Water quality Thickness |
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