Description
Multiply nonnegative hours by max(0, freezingReference-temperature) for freezingDegreeHours and by nonnegative coefficient for indexedExposure.
Degree-time indices accumulate temperature differences above or below a supplied threshold. Multiplying by a model coefficient creates a conditional estimate whose units depend on the time basis and coefficient.
Multiply nonnegative hours by max(0, freezingReference-temperature) for freezingDegreeHours and by nonnegative coefficient for indexedExposure.
When to use this tool
Use Soil Frost Freezing Degreehour Term when you need one explicit temperature-index or threshold component.
How to use the tool and how it works
- Enter temperature, freezingReference, hours, coefficient. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read freezingDegreeHours, indexedExposure. Use the output convention below.
Multiply nonnegative hours by max(0, freezingReference-temperature) for freezingDegreeHours and by nonnegative coefficient for indexedExposure.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| temperature | Temperature | Required. Finite number. |
| freezingReference | Freezing Reference | Required. Finite number. |
| hours | Hours | Required. Finite number; minimum 0. |
| coefficient | Coefficient | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| freezingDegreeHours | Freezing Degree Hours | Required. Finite number. |
| indexedExposure | Indexed Exposure | Required. Finite number. |
{
"input": {
"temperature": -5,
"freezingReference": 0,
"hours": 4,
"coefficient": 0.5
},
"output": {
"freezingDegreeHours": 20,
"indexedExposure": 10
}
}Limitations and assumptions
- Temperature differences use one scale and coefficient determines the index unit; this exposure term does not predict frost depth, soil damage, or safe conditions.
- 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
Check the threshold, coefficient calibration, and complete energy or environmental model separately.
References
Similar or alternative tools
- Potential Snowmelt Degreehour Factor
Multiply nonnegative hours by max(0, temperature-threshold) for degreeHours.
- Snow Layer Refreeze Capacity Term
Multiply nonnegative snowMass and suppliedHeatCapacity by max(0, -temperatureBelowZero) for coldContent.