Q. How does WAsP Engineering calculate the wind shear exponent?

A. WEng calculates the shear from the relation

where velocity and gradient are calculated at the selected height. Unlike data from measurement campaigns, the velocity gradient is not coming from a difference between wind speeds at two heights. This is because the FFT-based flow model LINCOM gives us a computationally faster method based on multiplication of wave numbers and Fourier components followed by inverse Fourier transformation. This provides velocity gradient everywhere in the computational domain.