On the application of a model of boundary-layer flow over low hills to real terrain
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Attempts to apply a computer model (Walmsley et al., 1980) to neutrally-stratified, boundary-layer flow over an isolated hill of moderate slope (Kettles Hill, Alberta) lead to velocity perturbation fields which probably overemphasize the impact of small-scale topographic features. Some numerical smoothing of the digitized terrain input field is found to be helpful in reducing this effect, although such a procedure is somewhat arbitrary. An extension of the original theory results in an improved representation of the effect of small-scale terrain components. These modifications are described and some results of an application of the extended model to Kettles Hill are presented.
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