Near-Surface Wind-Induced Mixing in a Mine Lake
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 10
Abstract
Wind sheltering can have a strong effect in small, sheltered water bodies; wind-induced mixing in the surface layer of a small mine lake has been investigated using field measurements. Wind speed was recorded at three locations and data suggested sheltering by topography and surface roughness changes with both fetch and the land–water transition. Wind sheltering effects in the near-surface waters were assessed using turbulent microstructure profiler measurements, providing an estimate of the sheltering distance consistent with the literature on “backward-facing” steps. A numerical simulation of the annual density stratification cycle was then performed, using the model DYRESM. Simulations indicated that inclusion of a sheltering algorithm based on the results of the field campaign significantly improved the model’s performance in capturing the surface mixed layer deepening associated with strong wind events.
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Acknowledgments
This work was supported by the Centre for Sustainable Mine Lakes. Thanks go to the Field Operations Group at the Center for Water Research for their help with organizing and conducting field work, to Dr. Marco Ghisalberti for comments on an early draft, and to our three reviewers whose comments have significantly improved the manuscript.
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© 2008 ASCE.
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Received: Jul 20, 2006
Accepted: Jan 23, 2008
Published online: Oct 1, 2008
Published in print: Oct 2008
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