Environmental Engineering Reference
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in the Jackson-Hunt theory is that the terrain causes a small perturbation to an oth-
erwise constant background wind. This assumption allows the equations to be solved
using a fast numerical technique.
No spatial modeling chapter would be complete without a discussion of WAsP
(Fig. 13-3), a Jackson-Hunt model developed by the Risø National Laboratory of
Denmark, which has been and probably remains the most widely used numerical wind
flow model in the wind industry. The “WAsP method” (Fig. 13-4) is deeply entrenched
in spatial modeling practice, especially in Europe. It proceeds in two stages. First, the
observed wind at a mast is used to derive the background wind field, which represents
Figure 13-3. Wind power map from the WAsP model, a popular wind flow modeling applica-
tion. Like other Jackson-Hunt models as well as mass-consistent models, WAsP captures the
tendency of wind speed to increase over high ground and decrease in valleys. Ridges oriented
perpendicular to the flow exhibit the greatest topographic acceleration. Source: Risø National
Laboratory.
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