Calving Front Retreat Distance
Integrate signed calving-minus-normal-ice-speed front retreat with trapezoids over time; negative values represent advance and front melt must be included externally if relevant.
Description
Calving retreats a front while incoming normal ice motion advances it.
Calving retreats a front while incoming normal ice motion advances it. Their difference gives a signed retreat rate that can be integrated over time.
Integrate signed calving-minus-normal-ice-speed front retreat with trapezoids over time; negative values represent advance and front melt must be included externally if relevant.
When to use Calving Front Retreat Distance
Use this for the following task: Integrate signed calving-minus-normal-ice-speed front retreat with trapezoids over time; negative values represent advance and front melt must be included externally if relevant.
Prepare the measurements and calibration parameters in the declared units. Keep vector entries aligned and choose a consistent spatial frame and time basis.
How to use Calving Front Retreat Distance and understand its results
- Prepare the measurements and calibration parameters in the declared units. Keep vector entries aligned and choose a consistent spatial frame and time basis.
- Enter timesYears, calvingSpeedsMPerYear, frontIceSpeedsMPerYear using the field table, then run the tool.
- Read netRetreatSpeedsMPerYear, integratedRetreatDistanceM. Interpret flags, units, ordering and placeholder values using the rules below.
- Review any reported issue or failed check, correct the supplied values when appropriate, and verify the result in its intended context.
| Input field | Meaning | Value type and bounds | Requirement |
|---|---|---|---|
| timesYears | Times years | list of number; each entry: number | Required |
| calvingSpeedsMPerYear | Calving speeds m per year | list of number; each entry: number | Required |
| frontIceSpeedsMPerYear | Front ice speeds m per year | list of number; each entry: number | Required |
Pair nonnegative speeds with strictly increasing observation times. Calculate signed rates and integrate adjacent intervals by trapezoids.1
retreatSpeed = calvingSpeed − iceSpeed; distance = trapezoidal integral over years This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.
| Output field | Meaning | Value type |
|---|---|---|
| netRetreatSpeedsMPerYear | Net retreat speeds m per year | list of number |
| integratedRetreatDistanceM | Integrated retreat distance m | number |
{
"input": {
"timesYears": [
0,
1,
2
],
"calvingSpeedsMPerYear": [
10,
20,
10
],
"frontIceSpeedsMPerYear": [
5,
5,
5
]
},
"output": {
"netRetreatSpeedsMPerYear": [
5,
15,
5
],
"integratedRetreatDistanceM": 20
}
}Limitations and assumptions
Negative values represent advance. Include frontal melt in supplied terms if relevant; no front geometry is tracked.
Constants and empirical coefficients are supplied rather than calibrated. Check units and observational applicability before interpreting the model. Malformed requests produce input errors. A successfully evaluated request can still contain false flags, empty result lists or a result outside the supplied threshold; those outcomes have the meanings stated above.
Alternative or Complementary methods
Choose Calving Rate Water Depth Power Law for this operation: Evaluate a calibrated water-depth power calving relation normalized by reference depth; coefficients, validity range and glacier type are externally supplied, not universal hazard predictions. For a complementary task, use Flux Gate Discharge for this operation: Integrate signed normal ice flux over supplied gate strips with depth-mean/surface velocity calibration; widths are physical section measurements, not geodesy coordinates.
The implementation reference documents the exact calculation, supported input shapes and returned fields.
References
-
Calving Front Retreat Distance — tool.io
Similar or alternative tools
- Calving Rate Water Depth Power Law
Evaluate a calibrated water-depth power calving relation normalized by reference depth; coefficients, validity range and glacier type are externally supplied, not universal hazard predictions.
- Flux Gate Discharge
Integrate signed normal ice flux over supplied gate strips with depth-mean/surface velocity calibration; widths are physical section measurements, not geodesy coordinates.