Estimation of wind-forced internal seiche amplitudes in lakes and reservoirs, with data from British Columbia, Canada |
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Authors: | Craig L. Stevens Gregory A. Lawrence |
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Affiliation: | (1) Environmental Fluid Mechanics Group, Dept. of Civil Engineering, The University of British Columbia, V6T 1Z4, B. C., Canada;(2) Present address: National Institute of Water and Atmospheric Research, Greta Point, PO Box 14901, Kilbirnie, New Zealand |
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Abstract: | Analyses of observations from four lakes in British Columbia, Canada, compare estimates of the amplitude of thermocline deflections to predictions of wind-driven internal seiche amplitudes made using the Wedderburn number,W. The study sites range from the 750 m diameter Brenda Mines pit-lake to the 107 km long Kootenay Lake. Causal filtering of the wind data with a frequency cut-off based on the fundamental baroclinic time-scale is critical for correct calculation ofW. With the filtering incorporated, good comparison betweenW, its integral equivalent the Lake numberL N and the observations can be made. In all but the mine pit-lake, upwelling or near-upwelling conditions (W≈1) were encountered. |
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Keywords: | Internal seiche wind stress, lakes thermocline, withdrawal, temperature effects |
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