Description
Calculate a supplied log height/roughness ratio.
Atmospheric scalar terms require explicit averaging, spectral, geometric and propagation conventions. One fluctuation product is not a time-averaged flux, a squared deviation is not a full scintillation index, and a Nyquist interval does not de-alias radar velocity. Layer terms require compatible units and model assumptions.
Calculate a supplied log height/roughness ratio.
When to use this tool
Use Wind Profile Log Height Reference when you already have height, roughnessLength and need to calculate a supplied log height/roughness ratio.
How to use the tool and how it works
- Enter height, roughnessLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read logHeightRatio. Use the output convention below.
Require both positive; return ln(height)-ln(roughnessLength).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| height | Height | Required. Finite number; strictly above 0. |
| roughnessLength | Roughness Length | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| logHeightRatio | Log Height Ratio | Required. Finite number. |
{
"input": {
"height": 10,
"roughnessLength": 0.1
},
"output": {
"logHeightRatio": 4.605170185988092
}
}Limitations and assumptions
- Comparable length units are required. This is one logarithmic-profile term, without friction velocity, displacement height, stability correction or an inferred wind speed.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use the complete measurement and physical retrieval model. Include calibration, averaging, source geometry, spectral response and relevant transfer or flow effects when local weights and signal factors cannot establish the desired atmospheric quantity.
References
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