A model of phytoplankton development in the Lot River (France).

Thébault, Jean-Marc; Qotbi, Azddine

doi:10.1016/s0043-1354(98)00284-x

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…For such purpose models can simulate scenarios including: inserting curtain walls, removing polluted soil, in situ (bio)chemical remediation or installing pumping/recharge wells (Wagner, 1992). For surface waters this type of models is used for development of long-time management scenarios for river basins or lakes and for assessment of the results of planned land use changes and investments (Kardaetz et al, 2008;Thebault & Qotbi, 1999;Yoshimura et al, 2009). Models of this type for atmospheric water quality are used widely to predict the impact of pollutants emissions on the eutrophication and acidification processes.…”

Section: Tools For Water Quality Modelling -Examples and Purposes Of Usementioning

confidence: 99%

Monitoring and Modelling of Water Quality

Samborska¹,

Ulańczyk²,

Korszun³

2012

Water Quality Monitoring and Assessment

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Section: Tools For Water Quality Modelling -Examples and Purposes Of Usementioning

confidence: 99%

Monitoring and Modelling of Water Quality

Samborska¹,

Ulańczyk²,

Korszun³

2012

Water Quality Monitoring and Assessment

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“…In this submodel, light and nutrient dependencies of cyanobacterial growth are described by Michaelis-Menten-type empirical equations, and the experimentally derived parameter values are taken from the literature [19,29,37].…”

Section: Model Theory and Developmentmentioning

confidence: 99%

Sensitivity Analysis of a Cyanobacterial Growth and Movement Model under Two Different Flow Regimes

Güven

Howard

2011

Environ Model Assess

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Bloom-forming and toxin-producing cyanobacteria remain a persistent nuisance across the world. Modelling cyanobacterial behaviour in freshwaters is an important tool for understanding their population dynamics and predicting the location and timing of the bloom events in lakes, reservoirs and rivers. A new deterministicmathematical model was developed, which simulates the growth and movement of cyanobacterial blooms in river systems. The model focuses on the mathematical description of the bloom formation, vertical migration and lateral transport of colonies within river environments by taking into account the major factors that affect the cyanobacterial bloom formation in rivers including light, nutrients and temperature. A parameter sensitivity analysis using a oneat-a-time approach was carried out. There were two objectives of the sensitivity analysis presented in this paper: to identify the key parameters controlling the growth and movement patterns of cyanobacteria and to provide a means for model validation. The result of the analysis suggested that maximum growth rate and day length period were the most significant parameters in determining the population growth and colony depth, respectively.

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“…As a synthetizing tool in this endeavor, we implemented the Riverstrahler model, an ecological model of drainage network (Billen et al 1994;Garnier et al 1995Garnier et al , 2002, embedded into a GIS-Seneque environment (Ruelland et al 2007), which, once validated, allows exploring scenarios of alternative water quality management. Differently from previous modeling approaches developed for the main branch of the Lot (Capblancq et al 1982;Thébaut and Quotbi 1999), the Seneque-Riverstrahler model operates at the scale of the whole watershed and takes other ecological compartments than phytoplankton explicitly into account.…”

Section: Introductionmentioning

confidence: 99%

How can water quality be improved when the urban waste water directive has been fulfilled? A case study of the Lot river (France)

Garnier

Ramarson

Thieu

et al. 2018

Environ Sci Pollut Res

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The Lot river, a major tributary of the downstream Garonne river, the largest river on the Northern side of the Pyrenees Mountains, was intensively studied in the 1970s. A pioneering program called "Lot Rivière Claire" provided a diagnosis of water quality at the scale of the whole watershed and proposed an ambitious program to manage nutrient pollution and eutrophication largely caused by urban wastewater releases. Later on, the implementation of European directives from 1991 to 2000 resulted in the nearly complete treatment of point sources of pollution in spite of a doubling of the basin's population. At the outlet of the Lot river, ammonium and phosphate contamination which respectively peaked to 1 mg N-NH L and 0.3 mg P-PO L in the 1980s returned to much lower levels in recent years (0.06 mg N-NH L and 0.02 mg P-PO L), a reduction by a factor 15. However, during this time, nitrate contamination has regularly increased since the 1980s, from 0.5 to 1.2 mg N-NO L in average, owing to the intensification of agriculture and livestock farming. Application of the Riverstrahler model allowed us to simulate the water quality of the Lot drainage network for the 2002-2014 period. We showed that, with respect to algal requirements, phosphorus and silica are well balanced, but nitrogen remains largely in excess over phosphorus and silica. This imbalance can be problematic for the ecological status of the water bodies. Using the model, for simulating various scenarios of watershed management, we showed that improvement of urban wastewater treatment would not result in any significant change in the river's water quality. Even though arable land occupies a rather limited fraction of the watershed area, only the adoption of better farming practices or more radical changes in the agro-food system could reverse the trend of increasing nitrate contamination.

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A model of phytoplankton development in the Lot River (France).

Cited by 13 publications

References 17 publications

Monitoring and Modelling of Water Quality

Monitoring and Modelling of Water Quality

Sensitivity Analysis of a Cyanobacterial Growth and Movement Model under Two Different Flow Regimes

How can water quality be improved when the urban waste water directive has been fulfilled? A case study of the Lot river (France)

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