September 14, 2012 Mountain Wave Study at a Wind Farm Site in the Eastern Rocky Mountains Dr. Philippe Beaucage Dr. Jeff Freedman Senior Research Scientist Lead Research Scientist Daniel W. Bernadett Chief Engineer Dan Michaud Meteorologist Dr. Michael C. Brower Chief Technical Officer
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Mountain Wave Study at Wind Farm Site in Eastern Rocky ...€¦ · capturing the magnitude and phase of the downslope winds at hub height; • ARPS simulations also showed that mountain
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Show a normal flow regime in January 2011 at upper levels (left) and near the surface (right) over the Eastern Rocky mountains (from NCEP/NCAR reanalysis data).
The project area is well situated for the generation and persistence of mountain wave‐induced downslope winds.
• Sonic and cup anemometers were shown to have reliable measurements;
• Numerical simulations indicated that ARPS is very accurate in capturing the magnitude and phase of the downslope winds at hub height;
• ARPS simulations also showed that mountain waves were responsible for the increase in wind speeds on the lee side of the mountain (due to a stable boundary layer);
• The winter of 2010‐2011 was a typical winter according to the surface and upper level anomaly maps (based on the NCEP/NCAR reanalysis).
Selected ReferencesLilly, D.K. (1978). “A severe downslope windstorm and aircraft turbulence event induced by a mountain wave”. J. Atmos. Sci. vol. 33, pp. 59‐77. Doyle, J.D. et al. (2000). “An intercomparison of model‐predicted wave breaking for the 11 January 1972 Boulder windstorm”. Mon. Wea. Rev., vol. 128, pp.901‐914.Xue, M., K. K. Droegemeier, and V. Wong (2000). “The Advanced Regional Prediction System (ARPS) ‐ A multiscale nonhydrostatic atmospheric simulation and prediction tool. Part I: Model dynamics and verification”. Meteor. Atmos. Physics., vol. 75, pp. 161‐193.Chow, F.K, R.L. Street (2009). “Evaluation of Turbulence Closure Models for Large‐Eddy Simulation over Complex Terrain: Flow over Askervein Hill”. J. Appl. Meteor. and Clim., vol. 48, pp. 1050‐1065.