Theoretical Study of Three-Dimensional Slope and Valley Wind Systems.
Final rept. 21 Oct 75-15 Dec 77,
ECOLOGICAL ENTERPRISES INC BEDFORD MA
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A numerical model for studying a three-dimensional mountain-valley wind system over a typical mountain-valley terrain has been developed. This model is non-hydrostatic with boussinesq approximation. The non-linear interaction between the thermally induced motion in the valley and the wind in the upper troposphere is investigated in a truly three-dimensional sense. The interplay between the slope wind and valley plain wind is examined. Computational results for different surface thermal conditions, geometrical factors of terrain, and meteorological and physical imputs have been obtained. Available observations and analytical theory appear to support several findings in this study. Another important contribution is the development of a method of computing surface temperature and heat flux in a typical valley terrain. This method has taken into consideration both the effect of the shadow cast by the ridge opposite the slope for different times of the day for the incoming solar radiation, and the effect of elevated mountain surface in the calculation of the effective long-wave radiation at given positions from the valley slope and valley floor. This method has checked well with observations in valleys in Vermont. Author