DIAZ Maria Soledad
Modeling phytoplankton community in reservoirs. A comparison between taxonomic and functional groups-based models
JIMENA DI MAGGIO; CAROLINA FERNANDEZ; ELISA PARODI; MARIA SOLEDAD DIAZ; VANINA G. ESTRADA
JOURNAL OF ENVIRONMENTAL MANAGEMENT
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Lugar: Amsterdam; Año: 2016 vol. 165 p. 31 - 52
In this paper we address the formulation of two mechanistic water quality models that differ in the way the phytoplankton community is described. We carry out parameter estimation subject to differential-algebraic constraints and validation for each model and comparison between models performance. The ﬁrst approach aggregates phytoplankton species based on their phylogenetic characteristics (Taxo-nomic group model) and the second one, on their morpho-functional properties following Reynolds´ classiﬁcation (Functional group model). The latter approach takes into account tolerance and sensitivity to environmental conditions. The constrained parameter estimation problems are formulated within an equation oriented framework, with a maximum likelihood objective function. The study site is Paso de las Piedras Reservoir (Argentina), which supplies water for consumption for 450,000 population. Nu-merical results show that phytoplankton morpho-functional groups more closely represent each species growth requirements within the group. Each model performance is quantitatively assessed by three diagnostic measures. Parameter estimation results for seasonal dynamics of the phytoplankton com-munity and main biogeochemical variables for a one-year time horizon are presented and compared for both models, showing the functional group model enhanced performance. Finally, we explore increasing nutrient loading scenarios and predict their effect on phytoplankton dynamics throughout a one-year time horizon.