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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| Institution: | (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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