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Solved zero wind velocity in Duran grainspeed #203

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Jul 26, 2024
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Solved zero wind velocity in Duran grainspeed #203

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11 changes: 9 additions & 2 deletions aeolis/transport.py
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Original file line number Diff line number Diff line change
Expand Up @@ -153,9 +153,16 @@ def duran_grainspeed(s, p):
dhn = np.repeat(dzn[:,:,np.newaxis], nf, axis = 2)

# Compute ets/etn (wind direction)
ets = np.ones(ustar.shape)
etn = np.zeros(ustar.shape)

# First, if uw is not zero, compute ets/etn based on uw
ix = (uw > 0.)
ets[ix] = uws[ix] / uw[ix] # s-component of ustar
etn[ix] = uwn[ix] / uw[ix] # n-component of ustar

# Second, if ustar is not zero, compute ets/etn based on ustar
ix = (ustar > 0.)
ets = uws / uw # s-component of wind (where ustar == 0)
etn = uwn / uw # n-component of wind (where ustar == 0)
ets[ix] = ustars[ix] / ustar[ix] # s-component of ustar
etn[ix] = ustarn[ix] / ustar[ix] # n-component of ustar

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