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Hub-Height Wind: Log Profile and Measured Shear

Adjust wind speed with a neutral log profile and valid roughness limits, or derive measured shear from comparable observations at two heights.

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Inputs that matter
Reference wind speed (m/s), Reference height (m), Target height (m), Roughness length z₀ (m), and 6 more
Output to expect
Neutral logarithmic wind profile, Shear from paired heights
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Neutral logarithmic wind profile

Extrapolate a measured wind speed using a neutral logarithmic profile with explicit reference height, target height, displacement and roughness. Reject heights outside the mathematical profile domain.

v₂/v₁ = ln((h₂−displacement)/z₀) / ln((h₁−displacement)/z₀).

Shear from paired heights

Calculate a power-law exponent from positive wind speeds measured at two different heights on a comparable time, direction and instrument basis. Optionally extrapolate that same profile to a target height.

α = ln(v₂/v₁)/ln(h₂/h₁); vtarget = v₁(htarget/h₁)^α.

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 7.468781 m/s at target height

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 0.131517 measured shear exponent

FAQ

Extrapolate a measured wind speed using a neutral logarithmic profile with explicit reference height, target height, displacement and roughness. Reject heights outside the mathematical profile domain. Calculate a power-law exponent from positive wind speeds measured at two different heights on a comparable time, direction and instrument basis. Optionally extrapolate that same profile to a target height.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Hub-Height Wind: Log Profile and Measured Shear

Extrapolate a measured wind speed using a neutral logarithmic profile with explicit reference height, target height, displacement and roughness. Reject heights outside the mathematical profile domain. Calculate a power-law exponent from positive wind speeds measured at two different heights on a comparable time, direction and instrument basis. Optionally extrapolate that same profile to a target height.