Flame Length From Fireline Intensity

Apply supplied unit-specific fireline-intensity/flame-length calibration inside its domain; no universal coefficient or tactics/safe-distance determination.

Description

Flame length can be modeled from fireline intensity using a calibrated power law.

Flame length can be modeled from fireline intensity using a calibrated power law. The coefficient depends on the declared units and calibration domain.^[1]

Apply supplied unit-specific fireline-intensity/flame-length calibration inside its domain; no universal coefficient or tactics/safe-distance determination.

When to use Flame Length From Fireline Intensity

Use this tool to apply supplied unit-specific fireline-intensity/flame-length calibration inside its domain; no universal coefficient or tactics/safe-distance determination.

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.

How to use Flame Length From Fireline Intensity and understand its results

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
Enter firelineIntensityKwPerM, calibratedFlameLengthCoefficient, calibratedPowerExponent, calibrationMaximumIntensityKwPerM using the field table and calculation rules, then run the tool.
Read modelFlameLengthM. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
firelineIntensityKwPerM	Fireline intensity kw per m	number	Required
calibratedFlameLengthCoefficient	Calibrated flame length coefficient	number	Required
calibratedPowerExponent	Calibrated power exponent	number	Required
calibrationMaximumIntensityKwPerM	Calibration maximum intensity kw per m	number	Required

Use positive coefficient, exponent and calibration maximum; enter nonnegative intensity no greater than that maximum. Return modeled meters, with zero intensity giving zero length.

flame length meters=coefficient × intensity kW/m^exponent

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
modelFlameLengthM	Model flame length m	number

json

{
  "input": {
    "firelineIntensityKwPerM": 100,
    "calibratedFlameLengthCoefficient": 0.1,
    "calibratedPowerExponent": 0.5,
    "calibrationMaximumIntensityKwPerM": 1000
  },
  "output": {
    "modelFlameLengthM": 1
  }
}

Limitations and assumptions

There is no universal coefficient or guaranteed extrapolation. Fire tactics and safe-distance decisions are not supplied.

Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Byram Fireline Intensity kW/m: Compute Byram heat-yield×consumed-fuel×front-spread fireline intensity using supplied dry fuel consumption, not full fuel load or a fire-danger/response recommendation. For a complementary task, use Crowning Initiation Foliar Moisture Threshold Checker: Evaluate named Van Wagner crown-initiation critical-intensity equation using canopy base height and dry-basis foliar moisture; exceeding this model threshold is not proof of active crown fire or an operational safety assessment.

References

Flame Length From Fireline Intensity — tool.io

Similar or alternative tools

Byram Fireline Intensity kW/m
Compute Byram heat-yield×consumed-fuel×front-spread fireline intensity using supplied dry fuel consumption, not full fuel load or a fire-danger/response recommendation.
Crowning Initiation Foliar Moisture Threshold Checker
Evaluate named Van Wagner crown-initiation critical-intensity equation using canopy base height and dry-basis foliar moisture; exceeding this model threshold is not proof of active crown fire or an operational safety assessment.