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Wind Rose: Duration, Coverage and Kinetic Resource

Group actual wind-direction observations into compass sectors, preserving calm hours, missing coverage and duration-weighted kinetic resource shares.

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Inputs that matter
Direction and speed observations, Direction sectors, Calm threshold (m/s), Air density (kg/m³), and 2 more
Output to expect
Direction and duration resource summary
  • 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

Direction and duration resource summary

Group actual wind-direction and speed-duration observations into centered compass sectors. Report duration, coverage, calm time and kinetic-flux contribution without cubing a sector-average speed.

Sector duration = Σ hours; kinetic resource weight = Σ(0.5ρv³ × hours); weighted mean speed = Σ(v × hours)/Σhours.

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.

→ 66.666667% resource-period coverage

FAQ

Group actual wind-direction and speed-duration observations into centered compass sectors. Report duration, coverage, calm time and kinetic-flux contribution without cubing a sector-average speed.

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 Wind Rose: Duration, Coverage and Kinetic Resource

Group actual wind-direction and speed-duration observations into centered compass sectors. Report duration, coverage, calm time and kinetic-flux contribution without cubing a sector-average speed.