Shear-induced convective mixing in bottom boundary layers on slopes


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LORKE, Andreas, Frank PEETERS, Alfred WÜEST, 2005. Shear-induced convective mixing in bottom boundary layers on slopes. In: Limnology and Oceanography. 50(5), pp. 1612-1619. ISSN 0024-3590. eISSN 1939-5590

@article{Lorke2005Shear-7275, title={Shear-induced convective mixing in bottom boundary layers on slopes}, year={2005}, number={5}, volume={50}, issn={0024-3590}, journal={Limnology and Oceanography}, pages={1612--1619}, author={Lorke, Andreas and Peeters, Frank and Wüest, Alfred} }

First publ. in: Limnology and Oceanography 50 (2005), 5, pp.1612-1619 Lorke, Andreas deposit-license Wüest, Alfred Lorke, Andreas 2011-03-24T17:33:09Z application/pdf Peeters, Frank Shear-induced convective mixing in bottom boundary layers on slopes 2005 eng Field data from a stratified lake demonstrate that buoyancy-driven convective mixing can be an important mechanism for the formation of well-mixed bottom boundary layers (BBLs) on slopes. Convective turbulence is caused by differential transport of stratified water masses along the slope of a basin. Because the current velocity usually decreases toward the sediment, water at some distance from the bottom is transported faster than is water below.<br />During upslope flow, this process leads to transport of heavier water on top of lighter water and hence to unstable stratification within the BBLs. Analogously, strong BBL stratification occurs during downslope flow. High-frequency<br />acoustic Doppler current profiler (ADCP) and temperature measurements in the BBLs of a lake revealed the cyclic occurrence of convective turbulence driven by periodic across-slope currents of internal seiching. The estimated maximum buoyancy flux within the BBLs was in good agreement with the highest observed dissipation rates of turbulent kinetic energy. This suggests that, in our specific case, classical bottom shear production and the mentioned buoyancy-driven (convective) production contributed by similar amounts to the turbulent kinetic energy. Peeters, Frank Wüest, Alfred 2011-03-24T17:33:09Z

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