Morphoedaphic Index MEI Calculator
Compute explicit TDS/mean-depth morphoedaphic index convention; not conductivity-based MEI, fish-yield prediction or universal productivity calibration.
Description
The morphoedaphic index has alternative measurement conventions.
The morphoedaphic index has alternative measurement conventions. This tool explicitly uses dissolved solids divided by mean depth.1
Enter nonnegative observed TDS and positive matched mean depth. Return mg/L per meter.
When to use Morphoedaphic Index MEI Calculator
Use Morphoedaphic Index MEI Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Conductivity-based MEI, fish yield and universal productivity calibration are excluded.
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 Morphoedaphic Index MEI 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 observedTdsMgLiter, matchedMeanLakeDepthM using the field table and calculation rules, then run the tool.
- Read tdsConventionMorphoedaphicIndexMgLiterPerM. 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 |
|---|---|---|---|
| observedTdsMgLiter | Observed tds mg liter | number | Required |
| matchedMeanLakeDepthM | Matched mean lake depth m | number | Required |
Enter nonnegative observed TDS and positive matched mean depth. Return mg/L per meter.
MEI=TDSmg/L/meanDepthMeters Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| tdsConventionMorphoedaphicIndexMgLiterPerM | Tds convention morphoedaphic index mg liter per m | number |
{
"input": {
"observedTdsMgLiter": 100,
"matchedMeanLakeDepthM": 10
},
"output": {
"tdsConventionMorphoedaphicIndexMgLiterPerM": 10
}
}Limitations and assumptions
Conductivity-based MEI, fish yield and universal productivity calibration are excluded.
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.
Alternative or Complementary methods
Use TDS From Conductivity Calculator: Conductivity and total dissolved solids require a local calibration on a consistent temperature basis. A universal conversion factor cannot describe every ionic mixture. For a complementary task, use Mean Depth Calculator: Mean lake depth is volume divided by matched surface area. Independent maximum depth provides a consistency check.
References
-
Morphoedaphic Index MEI Calculator — tool.io
Similar or alternative tools
- TDS From Conductivity Calculator
Conductivity and total dissolved solids require a local calibration on a consistent temperature basis. A universal conversion factor cannot describe every ionic mixture.
- Mean Depth Calculator
Mean lake depth is volume divided by matched surface area. Independent maximum depth provides a consistency check.