A standalone helper for computing Carlson TSI directly from observed
water quality measurements, without running the full prediction
pipeline. Useful for computing observed trophic state from grab
sample data for comparison against modelled predictions.
Usage
ok_tsi_observed(tp_ugl = NULL, chla_ugl = NULL, secchi_m = NULL)
Arguments
- tp_ugl
Numeric. Observed in-lake total phosphorus (ug/L).
Optional.
- chla_ugl
Numeric. Observed chlorophyll-a (ug/L). Optional.
- secchi_m
Numeric. Observed Secchi depth (m). Optional.
Value
A named list with elements tsi_tp, tsi_chla, tsi_secchi,
tsi_n, tsi_mean, and trophic_state.
References
Carlson, R.E. (1977). A trophic state index for lakes.
Limnology and Oceanography, 22(2), 361-369.
Examples
ok_tsi_observed(tp_ugl = 85, chla_ugl = 22, secchi_m = 0.8)
#> $tsi_tp
#> [1] 68.21303
#>
#> $tsi_chla
#> [1] 60.92313
#>
#> $tsi_secchi
#> [1] 63.2155
#>
#> $tsi_n
#> [1] 3
#>
#> $tsi_mean
#> [1] 64.11722
#>
#> $trophic_state
#> [1] "Eutrophic"
#>