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milancurcic
milancurcic
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Both roughness length (Zo)$z_0$ and zero plane displacement (d)$d$ seemed to be defined as the height above the ground at which wind speed theoretically becomes zero... But wind speed is also supposed to go to zero at d+Zo$d+z_0$. What is the difference between the two, and how should they actually be defined?

Both roughness length (Zo) and zero plane displacement (d) seemed to be defined as the height above the ground at which wind speed theoretically becomes zero... But wind speed is also supposed to go to zero at d+Zo. What is the difference between the two, and how should they actually be defined?

Both roughness length $z_0$ and zero plane displacement $d$ seemed to be defined as the height above the ground at which wind speed theoretically becomes zero. But wind speed is also supposed to go to zero at $d+z_0$. What is the difference between the two, and how should they actually be defined?

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environmentstudent
environmentstudent
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What is the difference between roughness length and zero plane displacement?

Both roughness length (Zo) and zero plane displacement (d) seemed to be defined as the height above the ground at which wind speed theoretically becomes zero... But wind speed is also supposed to go to zero at d+Zo. What is the difference between the two, and how should they actually be defined?