INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Optical Properties of Highly Turbid Shallow Lakes with Contrasting Turbidity Origins: the Ecological and Water Management Implications.
Autor/es:
PÉREZ, GONZALO; LAGOMARSINO, LEANDRO; ZAGARESE, HORACIO
Revista:
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Editorial:
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 130 p. 207 - 220
ISSN:
0301-4797
Resumen:
A comprehensive optical study of three highly turbid shallow lakes was presented. The lakes contained
very high concentrations of optically active substances [OASs] with clear differences in total suspended
solid [TSS] composition among them. Lakes presented elevated values of total absorption [at(¥ë)] and
scattering coefficients [b(¥ë)], which translated into extremely high light attenuation coefficients
[Kd(PAR)]. Differences among lakes in the estimation of Kd(PAR), using two typical estimators of light
penetration (i.e., nephelometric turbidity [Tn] and Secchi disk [ZSD]), were analysed. Kirk¡¯s optical model
was used to model Kd(PAR) using inherent optical properties [IOPs]. Modelled values of Kd(PAR) agreed
very well with those measured (R2 ¨ù 0.95). In addition, optical properties and Kirk¡¯s model were used to
determine water quality targets for restoring submerged aquatic vegetation [SAV]. Based on a minimum
light requirement for SAV of 10%, results showed that only an integrative remediation action, considering
substantial reduction of TSS and Chl a (95%), and CDOM (50%), must be contemplated to improve
maximum colonization depth for SAV to values higher than 0.7 m. On the other hand, phytoplankton
absorptive characteristics were also studied. In these lakes, phytoplankton showed different responses to
the nature of light competition. Some of the variation in specific phytoplankton absorption a*ph (¥ë). was
explained by differences in the ratio between unpigmented particulate absorption and phytoplankton
absorption (up to R2 ¨ù 0.48 for the blue band). Hydrologic optical results were discussed in terms of
ecological and management implications