Modelling eutrophication in shallow Dutch lakes

Los, F.J.; Rooij, N. M. de; Smits, J.G.C.

doi:10.1080/03680770.1983.11897409

Cited by 7 publications

(6 citation statements)

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“…The model computes that from 1985 to 1987 almost 20 percent of the algal carbon can be found on the bottom. Measurements based on chlorophyll indicate that in the shallow part this can be more than 50 percent (Van der Molen & Helmerhorst, 19781979198019811992198319841985198e 1987. Computed and measured chlorophyll in Lake Veluwe.…”

Section: Resultsmentioning

confidence: 99%

“…Several modules have been developed and tested previously. Computations concerning phytoplankton are performed by the BLOOM II model, which has been shown to be accurate and reliable in both fresh and salt water systems (Los et al, 1984;Los et al, 1988;Los, 1991). Included within DBS is also a light module which computes the components of the total extinction caused by non-living suspended matter as well as the Secchi depth (transparency) of the water (Buiteveld, 1990).…”

Section: Modelling Approachmentioning

confidence: 99%

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Mathematical modelling as a tool for management in eutrophication control of shallow lakes

Molen

Los²,

Ballegooijen

et al. 1994

Hydrobiologia

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The eutrophication model DELWAQ-BLOOM-SWITCH is developed to be a functional tool for water management. Therefore it includes nutrients, algal biomass and composition as well as water transparency. A module describing the interaction between water and bottom gives the model the flexibility to deal with measures, such as a decrease of the external phosphorus loading and flushing with water differing in composition from the lake water. This paper focuses on the functional aspects of the model, the results of an application on Lake Veluwe, The Netherlands, and the implications for water management.With one set of coefficients DBS reproduces the most important characteristics of Lake Veluwe for a period of two years before measures (reduction of the external loading and flushing during the winter months) and eight years after the measures. The phosphorus concentration decreased and became growth limiting for algae instead of nitrogen and light. Both in measurements and modelling results, the algal composition changed from blue-green algae dominance to green algae and diatom dominance. Lake Veluwe had a relatively short transient phase after reduction of external loading, because high nitrate concentrations in the flushing water inhibited a long period with high phosphorus releases from the bottom.Model calculations were carried out to investigate the effects of fish stock management and optimization of flushing. Both measures are promising.

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Section: Resultsmentioning

confidence: 99%

Section: Modelling Approachmentioning

confidence: 99%

Mathematical modelling as a tool for management in eutrophication control of shallow lakes

Molen

Los²,

Ballegooijen

et al. 1994

Hydrobiologia

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“…The freshwater version of the model has been applied to various shallow Dutch lakes (Los et al, 1984;Los and Brinkman, 1988;van der Molen et al, 1994). For modelling of the near field (i.e.…”

Section: Ecological Model Simulationmentioning

confidence: 99%

Patterns and trends in nutrients and phytoplankton in Dutch coastal waters: comparison of time-series analysis, ecological model simulation, and mesocosm experiments

Vries¹,

Duin²,

Peeters³

et al. 1998

ICES Journal of Marine Science

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In the Dutch coastal zone, nutrient and chlorophyll concentrations show gradients of up to one order of magnitude perpendicular to the coast within the first 30-50 km offshore. Time-series analysis reveals significant decreasing trends for dissolved inorganic phosphorus (40%) and total phosphorus (35%) and an increase in the dissolved inorganic N:P ratio from 25-30 to 40-55 over the period 1988-1995. Trends in nitrogen ( 15%), silicate (stable), and chlorophyll are smaller and generally not statistically significant. The trends in phosphorus reflect a proportional and immediate response to decreasing riverine inputs. The observed trends, spatial gradients, and long-term seasonal patterns are simulated quite well with a coupled physicalecological model with high spatial resolution for the coastal zone. The model results indicate no effect of decreasing phosphorus, but an important role for both nitrogen and light climate in primary production and algal biomass. These results have been reproduced in mesocosm experiments. Moreover, these experiments indicate a strong response of primary production and chlorophyll to nitrogen load, whereas secondary production (macrobenthos) remains relatively stable. Ecological efficiency of secondary production increases from 7% to >10%, with a decrease in nitrogen loading by 50% from the present level. In the absence of a significant nitrogen reduction in coastal waters, the mesocosm results cannot be related to field data as yet. However, the expectation is that reducing nitrogen inputs will not affect productivity at higher trophic levels to any great extent.1998 International Council for the Exploration of the Sea

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“…Most ecosystem models like those of Naranganset Bay (Kremer & Nixon, 1978), the Bristol Channel and Severn Estuary (Radford, 1978), the Ems-Dollard estuary (Colijn et al ., 1987 ;Baretta & Ruardij, 1988 ;De Jonge & De Groot ;, the Cumberland Basin (Keizer et al, 1987), the Western Wadden Sea (Lindeboom et al ., 1989), the stagnant salt water Lake Grevelingen (De Vries et al, 1988), the stagnant brackish Lake Veere (De Vries et al, 1990), the heavily polluted Scheldt estuary (Ouboter, 1988. Van Eck & De Rooij, 1990, and a large number of fresh water systems (Los, 1980 ;Los et al, 1984 ;Bak et al, 1990) simulate ecosystems, which are not exposed to major, actually realized changes in the physical environment . SMOES has to deal with three significantly distinct states of the ecosystem due to the storm-surge barrier construction .…”

Section: Smoes (= Simulation Model Oosterscheldementioning

confidence: 99%

SMOES: a simulation model for the Oosterschelde ecosystem

Schölten

Tol²

1994

Hydrobiologia

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SMOES is an invalid model in the Popperian sense of the word . Yet it might be a useful model, which accurately simulates some of the ecosystem behavior . Our knowledge of the Oosterschelde ecosystem is empirical and consists of a comprehensive set of observed data (experiments and in situ measurements) . Model usefulness will be investigated in terms of model adequacy (can a model simulate all system behavior) and reliability (does it simulate observed system behavior only) .The large impact of the building of a storm-surge barrier in the Oosterschelde Mouth (compartment West) allows us to distinguish two different systems . The quality of the simulation model, built and calibrated for the pre-barrier system, can so be tested by using it for the (new) post-barrier system . The question if the model does predict the post-barrier future will be answered .We apply a calibration method which generates not merely a single best value for each of the many badly known parameters, but which also enables us to estimate the uncertainty in the model outcome . If we use this method to calibrate SMOES for the pre-and for the post-barrier situation, and subsequently-estimate the uncertainty in the model results, we find no large (functional) shifts in the behavior of the main ecosystem properties . 453

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Modelling eutrophication in shallow Dutch lakes

Cited by 7 publications

References 1 publication

Mathematical modelling as a tool for management in eutrophication control of shallow lakes

Mathematical modelling as a tool for management in eutrophication control of shallow lakes

Patterns and trends in nutrients and phytoplankton in Dutch coastal waters: comparison of time-series analysis, ecological model simulation, and mesocosm experiments

SMOES: a simulation model for the Oosterschelde ecosystem

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