Description
Return air-filled porosity before and after a water change.
Soil measurements distinguish bulk volume, pore volume, water mass, fine earth and excluded rock or sand. Gravimetric water content and volumetric water content have different denominators; accessible-pore shares and bulk-volume shares are not interchangeable. Supplied normalization bounds do not establish a validated retention curve.
Return air-filled porosity before and after a water change.
When to use this tool
Use Soil Air Filled Porosity Moisture Sensitivity when checking the stated soil water, mass, pore or aggregate basis.
How to use the tool and how it works
- Enter porosity, initialWater, waterChange. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read initialAir, finalAir, airChange. Use the output convention below.
Return air-filled porosity before and after a water change. Require porosity in [0,1] and both water fractions within [0,porosity]; initialAir = porosity-initialWater, finalAir subtracts waterChange, airChange = -waterChange.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| porosity | Porosity | Required. Finite number; minimum 0; maximum 1. |
| initialWater | Initial Water | Required. Finite number; minimum 0. |
| waterChange | Water Change | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| initialAir | Initial Air | Required. Finite number. |
| finalAir | Final Air | Required. Finite number. |
| airChange | Air Change | Required. Finite number. |
{
"input": {
"porosity": 0.5,
"initialWater": 0.2,
"waterChange": 0.1
},
"output": {
"initialAir": 0.3,
"finalAir": 0.19999999999999998,
"airChange": -0.1
}
}Limitations and assumptions
- This assumes fixed total porosity and matching bulk-volume bases; actual gas connectivity, compaction and root/soil conditions are not determined.
- 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 verified sampling, density and moisture measurements with the intended complete soil model for field water status, structure or management conclusions.
References
Similar or alternative tools
- Soil Water Conversion Bulk Density Sensitivity
Return gravimetric-to-volumetric water conversion and density sensitivity.
- Soil Pore Water Volume Subsample Term
Return subsample water volume and whole equivalent.