Euphotic Zone Depth From Secchi Calculator
Estimate euphotic depth from actual Secchi and explicit locally calibrated multiplier, retaining beyond-bottom model value; not Beer–Lambert threshold inversion or a universal biological light depth.
Description
Secchi-based euphotic depth uses a caller’s local multiplier.
Secchi-based euphotic depth uses a caller’s local multiplier. An estimate beyond bottom should remain visible as a modeled value.1
Enter positive observed Secchi depth, multiplier and bottom depth. Return unclipped estimated depth and inclusive bottom flag.
When to use Euphotic Zone Depth From Secchi Calculator
Use Euphotic Zone Depth From Secchi Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No universal multiplier, direct biological light measurement or Beer–Lambert threshold inversion is supplied.
Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
How to use Euphotic Zone Depth From Secchi Calculator and understand its results
- Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
- Enter observedSecchiDepthM, callerEuphoticSecchiMultiplier, lakeBottomDepthM using the field table and calculation rules, then run the tool.
- Read unclippedSecchiEstimatedEuphoticDepthM, estimatedEuphoticZoneReachesBottom. 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 |
|---|---|---|---|
| observedSecchiDepthM | Observed secchi depth m | number | Required |
| callerEuphoticSecchiMultiplier | Caller euphotic secchi multiplier | number | Required |
| lakeBottomDepthM | Lake bottom depth m | number | Required |
Enter positive observed Secchi depth, multiplier and bottom depth. Return unclipped estimated depth and inclusive bottom flag.
depth=Secchi×multiplier; reachesBottom=depth≥bottom Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| unclippedSecchiEstimatedEuphoticDepthM | Unclipped secchi estimated euphotic depth m | number |
| estimatedEuphoticZoneReachesBottom | Estimated euphotic zone reaches bottom | boolean |
{
"input": {
"observedSecchiDepthM": 2,
"callerEuphoticSecchiMultiplier": 2.5,
"lakeBottomDepthM": 4
},
"output": {
"unclippedSecchiEstimatedEuphoticDepthM": 5,
"estimatedEuphoticZoneReachesBottom": true
}
}Limitations and assumptions
No universal multiplier, direct biological light measurement or Beer–Lambert threshold inversion is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Light Extinction Coefficient Secchi Calculator: Secchi depth can support an optical attenuation estimate under a locally calibrated product. The coefficient is modeled rather than directly measured. For a complementary task, use Photic Zone Percent Depth Calculator: Photic depth relative to maximum lake depth is a depth ratio. A modeled light depth can extend beyond the physical bottom.
References
Similar or alternative tools
- Light Extinction Coefficient Secchi Calculator
Secchi depth can support an optical attenuation estimate under a locally calibrated product. The coefficient is modeled rather than directly measured.
- Photic Zone Percent Depth Calculator
Photic depth relative to maximum lake depth is a depth ratio. A modeled light depth can extend beyond the physical bottom.