Description
Return short/intermediate, intermediate/long, and cube root of short²/(long × intermediate).
Sediment and soil calculations distinguish mass basis, solid density, bulk volume, and grain-size conventions. Changing moisture or grain-size scale changes the denominator or coordinate, not the physical sample itself.
Return short/intermediate, intermediate/long, and cube root of short²/(long × intermediate).
When to use this tool
Use Sediment Clast Axis Shape Ratio when you need an explicit sediment or material-basis conversion.
How to use the tool and how it works
- Enter longAxis, intermediateAxis, shortAxis. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read flatnessRatio, elongationRatio, sphericityProxy. Use the output convention below.
Require positive shortAxis and ordered intermediateAxis and longAxis. Return short/intermediate, intermediate/long, and cube root of short²/(long × intermediate).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| longAxis | Long Axis | Required. Finite number. |
| intermediateAxis | Intermediate Axis | Required. Finite number. |
| shortAxis | Short Axis | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| flatnessRatio | Flatness Ratio | Required. Finite number. |
| elongationRatio | Elongation Ratio | Required. Finite number. |
| sphericityProxy | Sphericity Proxy | Required. Finite number. |
{
"input": {
"longAxis": 8,
"intermediateAxis": 4,
"shortAxis": 2
},
"output": {
"flatnessRatio": 0.5,
"elongationRatio": 0.5,
"sphericityProxy": 0.5
}
}Limitations and assumptions
- All are full clast axes in one unit; these named shape ratios and proxy do not identify lithology, transport history, true surface-based sphericity, or measurement uncertainty.
- 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 a traceable laboratory and sampling method for the required material property. Align wet/dry basis, solid versus bulk density, grain-size scale, and interval definitions before comparing samples.
References
Similar or alternative tools
- Grain Size Phi Uncertainty Width Transform
Compute phi as negative log2 of the numeric diameter in millimeters, reverse diameter extrema for phi bounds, and return logarithmic width.
- Sediment Bulk Density Basis Flag
Select wet mass or wet minus water under reportDry and divide by bulk volume.