A New Trophic State Index for Lagoons

Table 4

TSI and corresponding values of Chl-a, NO₂-N, and SDD computed using Model C. It is noticeable that this model covers large ranges of NO₂-N between 0.13 and 61.99 𝜇g L⁻¹ and Chl-a between 1.00 and 322.18 mg m⁻³. Model C shows significant improvement over Model A and Model B.

TSI	SDD computed (cm)	NO2-N computed (𝜇g L^−1)	Chl-a computed (mg m^−3)
0	200	—	—
10	128	—	—
20	82	0.13	1.00
30	52	1.13	6.19
40	33	2.69	14.31
50	21	5.14	27.01
60	14	8.97	46.89
70	9	14.96	78.01
80	6	24.34	126.70
90	4	39.02	202.91
100	2	61.99	322.18