In Risø Smooth-Terrain Model,What does the ΦA and ΦE stand for and what are their expressions ?
I don’t have my notes on these models anymore, but the code documents the two values as follows:
phiM = 1.0 + 4.7*zL ! Non-Dimensional Wind Shear
phiE = (1.0 + 2.5*zL^0.6)^(3/2) where zL is a stability parameter based on RICH_NO:
if (RICH_NO <= 0)
zL = RICH_NO
else if (RICH_NO <= 1/6)
zL = RICH_NO / ( 1 - 5*RICH_NO )
zL = 1
Thank you for your reply.