A model for analysis of multivariable systems with an application to ecology

Papadopoulos, Basil K.; Yiannakopoulou, Trisevgeni; Elias, Nicholas

doi:10.1016/0304-3800(94)90117-1

Cited by 3 publications

(1 citation statement)

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“…Water quality data for Vistonis lagoon, for the period before the implementation of the protective measures (i.e., 1983-84) are available from previous studies. On the basis of nutrients, Chl a concentrations and phytoplankton dominant groups, the lagoon was classified as eutrophic in the 1980's (Yiannakopoulou, 1989(Yiannakopoulou, , 1991(Yiannakopoulou, , 1992Papadopoulos et al, 1994). In this paper, results of a new field survey are presented, where water quality data were collected in the lagoon after implementation of protective measures, in an effort to evaluate its current trophic status and the effectiveness of the protective measures.…”

Section: Study Area Descriptionmentioning

confidence: 98%

Water Quality Trends in a Coastal Lagoon Impacted by Non-point Source Pollution after Implementation of Protective Measures

2006

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Water quality data from two different monitoring periods are used to evaluate the trophic state and effectiveness of various protective measures on the restoration of a eutrophic, coastal Mediterranean lagoon. Main protective measures included elimination of municipal/industrial raw wastewater discharges in the rivers outflowing to the lagoon, sediment/erosion control practices in the lagoon's drainage basin (i.e., construction of sediment/debris dams and grade control structures, reforestation and ban on livestock grazing), and reduction of fertilizer application quantities as a result of changes in crops. Water quality data include, among others, chlorophyll a, dissolved oxygen and nutrient concentrations, various physicochemical parameters, and transparency, measured during two monitoring periods, i.e., before and after (1998-99) implementation of protective measures. Rainfall depth for the two time periods was also available. Empirical equations were developed, from statistical analyses of the data, relating the water quality parameters during the two monitoring periods. These models help identify water quality trends. Based on the analyses, it seems that measures were effective in reducing sediments transported into the lagoon. However, the lagoon remains eutrophic to hypereutrophic, mostly due to phosphorus released in the water column from bottom sediments. Therefore, future restoration efforts should be directed towards the management of bottom sediments.

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Section: Study Area Descriptionmentioning

confidence: 98%

Water Quality Trends in a Coastal Lagoon Impacted by Non-point Source Pollution after Implementation of Protective Measures

2006

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Investigation of multivariable systems

Stephanis

Papadopoulos

Elias

1994

Applied Mathematical Modelling

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Hydrodynamic and nutrient modeling in a Mediterranean coastal lagoon

Gikas

Yiannakopoulou

Tsihrintzis

2009

Journal of Environmental Science and Health, Part A

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The USEPA WASP5 modeling system was applied to simulate and evaluate the relationships between external and internal nutrient loadings and water quality of Vistonis lagoon, North Greece for a 2-year time period. The hydrodynamic model DYNHYD5 was calibrated to estimate daily lagoon water level. The water quality models TOXI5 and EUTRO5 were calibrated and verified using meteorological data from a station near the lagoon, and field data (salinity, dissolved oxygen, nutrients and chlorophyll-a concentrations) from seven stations located in the lagoon, for the time period April 1998 to May 1999. Predicted by the model salinity, dissolved oxygen, total phosphorus, total inorganic nitrogen and chlorophyll-a were plotted against observed values and showed good agreement. Model performance was evaluated using scattergrams of predicted versus observed values and the Kolmogorov-Smirnov two-sample goodness-of-fit test at p < 0.05. Sediment sources of nitrogen and phosphorus were important to achieve a successful model calibration. The validated model was also used to test the effectiveness of alternative management scenarios in relation to improvement of the trophic state of the lagoon.

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A model for analysis of multivariable systems with an application to ecology

Cited by 3 publications

References 4 publications

Water Quality Trends in a Coastal Lagoon Impacted by Non-point Source Pollution after Implementation of Protective Measures

Water Quality Trends in a Coastal Lagoon Impacted by Non-point Source Pollution after Implementation of Protective Measures

Investigation of multivariable systems

Hydrodynamic and nutrient modeling in a Mediterranean coastal lagoon

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