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The Risø Smooth-Terrain Model

Posted: Thu Jan 18, 2018 10:44 pm
by XuYao.Zhang
Hi everyone,
In Risø Smooth-Terrain Model,What does the ΦA and ΦE stand for and what are their expressions ?

Re: The Risø Smooth-Terrain Model

Posted: Mon Jan 22, 2018 9:15 pm
by Bonnie.Jonkman
I don't have my notes on these models anymore, but the code documents the two values as follows:

Code: Select all

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:

Code: Select all

if (RICH_NO <= 0)
   zL = RICH_NO
else if (RICH_NO <= 1/6)
   zL = RICH_NO / ( 1 - 5*RICH_NO )
else
   zL = 1
end

Re: The Risø Smooth-Terrain Model

Posted: Tue Jan 23, 2018 1:04 am
by XuYao.Zhang
Thank you for your reply.