Lava Front Advance Speed Basaltic
Invert a bulk volume budget to front advance with caller section shape and diverted/storage fraction; excludes cooling, changing morphology and topographic branching, not a lava arrival forecast.
Description
A supplied lava discharge advances a front only after side diversion and storage are accounted for.
A supplied lava discharge advances a front only after side diversion and storage are accounted for. Cross-section geometry converts volume rate to length rate.
Invert a bulk volume budget to front advance with caller section shape and diverted/storage fraction; excludes cooling, changing morphology and topographic branching, not a lava arrival forecast.
When to use Lava Front Advance Speed Basaltic
Use this tool to invert a bulk volume budget to front advance with caller section shape and diverted/storage fraction; excludes cooling, changing morphology and topographic branching, not a lava arrival forecast.
Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
How to use Lava Front Advance Speed Basaltic and understand its results
- Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
- Enter suppliedBulkDischargeM3PerSecond, sideAndStorageLossFraction, frontWidthM, frontThicknessM, crossSectionShapeFraction using the field table and calculation rules, then run the tool.
- Read modelFrontAdvanceMPerSecond. 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 |
|---|---|---|---|
| suppliedBulkDischargeM3PerSecond | Supplied bulk discharge m3 per second | number | Required |
| sideAndStorageLossFraction | Side and storage loss fraction | number | Required |
| frontWidthM | Front width m | number | Required |
| frontThicknessM | Front thickness m | number | Required |
| crossSectionShapeFraction | Cross section shape fraction | number | Required |
Use positive width, thickness and shape fraction, nonnegative discharge and fractions in [0,1], with shape greater than zero. A total loss fraction of one gives zero advance.1
front speed = discharge × (1 − loss fraction)/(width × thickness × shape fraction) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| modelFrontAdvanceMPerSecond | Model front advance m per second | number |
{
"input": {
"suppliedBulkDischargeM3PerSecond": 10,
"sideAndStorageLossFraction": 0.2,
"frontWidthM": 4,
"frontThicknessM": 2,
"crossSectionShapeFraction": 0.5
},
"output": {
"modelFrontAdvanceMPerSecond": 2
}
}Limitations and assumptions
Cooling, topographic branching and changing morphology are excluded; this is not an arrival-time forecast.
Numbers and computed results must be finite; overflow 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 Lava Flow Volume Effusion Duration: Integrate piecewise dense-magma discharge into DRE and separately expanded emplaced bulk lava volume; unlike survey-rate inference, flow is a supplied forward boundary condition. For a complementary task, use Effusion Rate Average Cubic KM Day: Infer observed interval/whole-span bulk effusion and vesicle-corrected DRE rate from matched surveys; no generic arithmetic average of interval rates or volume loss during emplacement is assumed.
References
-
Lava Front Advance Speed Basaltic — tool.io
Similar or alternative tools
- Lava Flow Volume Effusion Duration
Integrate piecewise dense-magma discharge into DRE and separately expanded emplaced bulk lava volume; unlike survey-rate inference, flow is a supplied forward boundary condition.
- Effusion Rate Average Cubic KM Day
Infer observed interval/whole-span bulk effusion and vesicle-corrected DRE rate from matched surveys; no generic arithmetic average of interval rates or volume loss during emplacement is assumed.