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Minor correction
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edit approved Sep 22, 2021 at 12:04
Community Bot
edit approved Sep 22, 2021 at 12:04
Community Bot
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Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity ${u^*}$${u_*}$ divided by the vertical shear $\frac{dU}{dz}$. Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to ${z}$.

The displacement height ${d}$ is given by the height at which the mixing length approaches zero. The friction velocityroughness length ${z_0}$ is, however, still needed to match the wind speed profile.

Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity ${u^*}$ divided by the vertical shear $\frac{dU}{dz}$. Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to ${z}$.

The displacement height ${d}$ is given by the height at which the mixing length approaches zero. The friction velocity ${z_0}$ is, however, still needed to match the wind speed profile.

Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity ${u_*}$ divided by the vertical shear $\frac{dU}{dz}$. Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to ${z}$.

The displacement height ${d}$ is given by the height at which the mixing length approaches zero. The roughness length ${z_0}$ is, however, still needed to match the wind speed profile.

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edit approved Sep 18, 2021 at 3:58
Muidhan Budghif
edit approved Sep 18, 2021 at 3:58
Muidhan Budghif
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Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity (u*)${u^*}$ divided by the vertical shear (dU/dz)$\frac{dU}{dz}$. Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to z${z}$.

The displacement height d${d}$ is given by the height at which the mixing length approaches zero. The friction velocity z0${z_0}$ is, however, still needed to match the wind speed profile.

Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity (u*) divided by the vertical shear (dU/dz). Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to z.

The displacement height d is given by the height at which the mixing length approaches zero. The friction velocity z0 is, however, still needed to match the wind speed profile.

Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity ${u^*}$ divided by the vertical shear $\frac{dU}{dz}$. Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to ${z}$.

The displacement height ${d}$ is given by the height at which the mixing length approaches zero. The friction velocity ${z_0}$ is, however, still needed to match the wind speed profile.

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Martin
Martin
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Let me add to the previous answer: In mixing length theory the mixing length is often defined as the friction velocity (u*) divided by the vertical shear (dU/dz). Both of these quantities can be measured more or less directly at different heights. In the absence of buildings/canopy the mixing length is to a first approximation proportional to z.

The displacement height d is given by the height at which the mixing length approaches zero. The friction velocity z0 is, however, still needed to match the wind speed profile.