HIGHLIGHTS
SUMMARY
Alternate forms were also examined for the terrain-drag portion of_(22), but did not give reasonable predictions (e_g using other combinations involving | h/ x| and/or means and standard deviations of h/ x, instead of the product σ h/ x | h/ y| ). Effective roughness formulations based on terrain elevation variance (e_g Flack and Schultz 2010; Anderson and Meneveau 2011; Kelly 2016) have difficulty predicting z 0,eff within one order of magnitude, over the range of terrain complexities found in nature. The form indeed offers good predictions of z 0,eff, when using -(21 . . .
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