Skid Trail Bulk Density Compaction Percent Increase

Compare matched dry bulk-density cores using paired and physical-volume-weighted contrasts, preserving apparent decompaction; unlike simple porosity conversion, no compaction damage or trafficability conclusion.

Description

Matched dry bulk-density cores measure change after traffic.

Matched dry bulk-density cores measure change after traffic. Pooling by represented volume differs from averaging individual relative changes.^[1]

When to use Skid Trail Bulk Density Compaction Percent Increase

Use this tool to compare matched dry bulk-density cores using paired and physical-volume-weighted contrasts, preserving apparent decompaction; unlike simple porosity conversion, no compaction damage or trafficability conclusion.

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

How to use Skid Trail Bulk Density Compaction Percent Increase 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 preTrafficDryBulkDensitiesKgPerM3, postTrafficDryBulkDensitiesKgPerM3, representedCoreVolumesM3 using the field table and calculation rules, then run the tool.
Read pairedDensityPercentChanges, volumeWeightedDensityPercentChange. 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
preTrafficDryBulkDensitiesKgPerM3	Pre traffic dry bulk densities kg per m3	list of number	Required
postTrafficDryBulkDensitiesKgPerM3	Post traffic dry bulk densities kg per m3	list of number	Required
representedCoreVolumesM3	Represented core volumes m3	list of number	Required

Pair positive before/after kg/m³ and positive represented core m³. Return every signed paired percentage and the ratio of volume-weighted pooled masses.

Paired lists must be nonempty and have equal lengths.

paired change %=100(after−before)/before; pooled %=100(Σafter × volume−Σbefore × volume)/Σbefore × volume

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

Output field	Meaning	Value type
pairedDensityPercentChanges	Paired density percent changes	list of number
volumeWeightedDensityPercentChange	Volume weighted density percent change	number

json

{
  "input": {
    "preTrafficDryBulkDensitiesKgPerM3": [
      1000,
      1200
    ],
    "postTrafficDryBulkDensitiesKgPerM3": [
      1200,
      1100
    ],
    "representedCoreVolumesM3": [
      1,
      2
    ]
  },
  "output": {
    "pairedDensityPercentChanges": [
      20,
      -8.333333333333334
    ],
    "volumeWeightedDensityPercentChange": 0
  }
}

Limitations and assumptions

Negative apparent decompaction remains visible. Soil damage and trafficability are not inferred from density alone.

Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Maximum Rut Depth Operational Limit Checker: Audit measured rut-depth exceedances and represented trail-length fraction under caller operational limit; equality is allowed and no ecosystem/access safety or regulation is embedded. For a complementary task, use Brash Mat Ground Pressure Reduction Factor: Compare declared normal-load pressure under bare versus independently supplied effective brash-mat spread areas; ideal uniform pressure model excludes mat stiffness, failure and safe trafficability.

References

Skid Trail Bulk Density Compaction Percent Increase — tool.io

Similar or alternative tools

Maximum Rut Depth Operational Limit Checker
Audit measured rut-depth exceedances and represented trail-length fraction under caller operational limit; equality is allowed and no ecosystem/access safety or regulation is embedded.
Brash Mat Ground Pressure Reduction Factor
Compare declared normal-load pressure under bare versus independently supplied effective brash-mat spread areas; ideal uniform pressure model excludes mat stiffness, failure and safe trafficability.