Modelling the eutrophication of the Seine Bight (France) under historical, present and future riverine nutrient loading

Cugier, Philippe; Billen, Gilles; Guillaud, Jean-François; Garnier, Josette; Ménesguen, Alain

doi:10.1016/j.jhydrol.2004.07.049

Cited by 141 publications

(104 citation statements)

References 29 publications

(41 reference statements)

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“…Although they are basic natural constituents in aquatic ecosystems, excessive inputs of nutrients can significantly accelerate the processes of eutrophication, e.g., the development of algal blooms-sometimes harmful-and oxygen depletion (Wassmann and Olli 2004;Cugier et al 2005;Diaz and Rosenberg 2008;Thieu et al 2009). In terrestrial ecosystems, anthropogenic N inputs, either deliberately brought through cultivation of N-fixing crops and application of industrial fertilizer or unintentionally coming through atmospheric deposition of N oxides generated by high-temperature combustion, are commonly reported as responsible for elevated N export to the coastal zone (Howarth et al 1996;Boyer and Howarth 2008).…”

Section: Introductionmentioning

confidence: 99%

N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

et al. 2010

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The Red River Delta (RRD) (Vietnam), a region experiencing rapid population growth, industrialization, and economic development, concentrates 54% of the population of the whole Red River watershed in less than 10% of the basin area. Our study aimed at understanding and quantifying the processes by which the delta affects the nutrient fluxes coming from the upstream watershed before they reach the sea. A comprehensive budget of nitrogen (N), phosphorus (P), and silica (Si) fluxes associated with natural and anthropogenic processes in the terrestrial and hydrological system of the delta was established for five sub-basins of the delta for the period 2000-2006, based on official statistical data, available measurements, and our own sampling campaigns and enquiries. The results show that anthropogenic inputs of N and P brought into the delta area are higher than the amounts delivered by the river from the upstream watershed. However, the amounts of these two elements ultimately delivered to the coastal zone from the delta are lower than the amounts carried by the upstream river, showing extremely efficient retention of both the soils and the delta's drainage network. For Si (taking into account both dissolved and amorphous solid forms), the retention is much lower. High retention of N and P and low retention of Si in the delta area have up to now protected the coastal zone from severe eutrophication problems.Electronic supplementary material The online version of this article

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Section: Introductionmentioning

confidence: 99%

N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

et al. 2010

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“…Such models exist for the river drainage basin, the estuary and the adjacent coastal sea and have been partially coupled (e.g. Cugier et al, 2005) in an offline mode (e.g. Arndt et al, 2011;Lancelot et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Modelling phytoplankton succession and nutrient transfer along the Scheldt estuary (Belgium, The Netherlands)

Gypens

Delhez

Vanhoutte-Brunier

et al. 2013

Journal of Marine Systems

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a b s t r a c t a r t i c l e i n f oThe freshwater (RIVE) and the marine (MIRO) biogeochemical models were coupled to a 1D hydrosedimentary model to describe contemporary phytoplankton succession and nutrient transfers in the macrotidal Scheldt estuary (BE/NL) affected by anthropogenic nutrient loads. The 1D-RIVE-MIRO model simulations are performed between Ghent and Vlissingen and the longitudinal estuarine profiles are validated by visual and statistical comparison with physico-chemical and phytoplankton observations available for the year 2006. Results show the occurrence of two distinct spatial phytoplankton blooms in the upper and lower estuary, suggesting that neither the freshwater nor the marine phytoplankton gets over the maximum turbidity zone (MTZ) at the saline transition. Sensitivity tests performed to understand how changing conditions (salinity, turbidity and nutrients) along the estuary are controlling this bimodal spatial phytoplankton distribution identify salinity and light availability as the key drivers while the grazing pressure and nutrient limitation play a negligible role. Additional tests with varying salinity-resistant (euryhaline) species in the freshwater assemblage conclude that the presence (or absence) of euryhalines determines the magnitude and the spreading of freshwater and marine phytoplankton blooms in the estuary. Annual nutrient budgets estimated from 1D-RIVE-MIRO simulations show that biological activities have a negligible impact on nutrient export but modify the speciation of nutrients exported to the coastal zone towards inorganic forms, thus directly available to phytoplankton. The implementation of nutrient reduction options (upgrading of waste water treatment plants, conversion to organic farming) on the Scheldt watershed influences the whole estuary and affects both the magnitude and the speciation of nutrients exported to the coastal zone with expected impact on coastal phytoplankton dynamic.

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“…En Bretagne, ces apports continentaux sont à l'origine de phénomènes d'eutrophisation marine comme la croissance excessive des algues vertes sur le littoral (MÉNESGUEN et PIRIOU, 1995) ou le développement en masse du phytoplancton (CHAPELLE et al, 1994;SMAYDA, 2005). Le suivi des concentrations en nutriments aux exutoires des fleuves est également nécessaire pour introduire les flux de sels nutritifs d'origine continentale dans les modèles côtiers de production algale (CUGIER et al, 2005;LE PAPE et MÉNESGUEN, 1997).…”

Section: Introductionunclassified

Relation concentration-débit et évolution temporelle du nitrate dans 25 rivières de la région Bretagne (France)

Guillaud

Bouriel²

2007

rseau

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La concentration de nitrate dans les 25 principales rivières bretonnes est, dans 90 % des cas, corrélée positivement au débit. Les caractéristiques hydrogéologiques des bassins versants jouent sur les termes de cette corrélation; ainsi, un taux d’écoulement superficiel important (caractéristique des bassins versants peu perméables) renforce cette corrélation et diminue le décalage temporel entre les pointes de crue et de concentration de nitrate.L’évolution pluriannuelle des concentrations de nitrate dans les rivières bretonnes est caractérisée par un quadruplement durant les trente dernières années. Par contre, depuis le milieu des années 90, on observe sur 80 % des rivières une tendance à la décroissance, indépendamment des évolutions pluriannuelles des débits. Le taux annuel de décroissance est d’autant plus fort que le bassin versant présente une part importante d’écoulements superficiels, et a donc une moins grande inertie hydrogéologique.Étant donné que les temps de réaction des bassins versants sont relativement courts (2‑10 ans), il se peut que l’on commence à constater l’effet sur les eaux superficielles d’une inversion de tendance concernant la pression agricole (baisse des fumures organiques et minérales azotées depuis le début des années 90). Ces tendances restent à confirmer et ne permettent pas encore d’atteindre, dans de nombreuses rivières, des concentrations de nitrate inférieures au seuil à partir duquel se produisent des proliférations macroalgales en zone côtière, ou de permettre sans problème la production d’eaux destinées à la consommation humaine.The study of the twenty-five largest rivers of Brittany showed that nitrate concentrations are positively correlated with river flow, in 90 % of the cases. The hydrogeological characteristics of the watersheds had an influence on these relationships. In this respect, river basins characterized by prevalent surficial water runoff exhibited higher correlation coefficients and lower lag times between river flow sequences and nitrate concentrations.The multi-year trend in riverine nitrate concentrations indicated a fourfold increase over 30 years. Nevertheless, 80% of rivers exhibited a recent decrease in nitrate concentrations, independent of inter-annual river flow fluctuations. The highest annual rates of nitrate decrease corresponded to river basins for which rapid surficial runoff, a sign of lower hydrogeological “inertia”, was prevalent. This result may be due to a decrease in agricultural pressure (i.e., a decrease of organic manure and mineral fertilizer use since the 1990’s) in watersheds with a fairly short reaction time (between 2 and 10 years). Nevertheless this decrease in nitrate concentrations must continue in order to reach concentrations low enough to limit macroalgal eutrophication in coastal zones and to attain levels that are safe for human consumption as drinking water

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Modelling the eutrophication of the Seine Bight (France) under historical, present and future riverine nutrient loading

Cited by 141 publications

References 29 publications

N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

Modelling phytoplankton succession and nutrient transfer along the Scheldt estuary (Belgium, The Netherlands)

Relation concentration-débit et évolution temporelle du nitrate dans 25 rivières de la région Bretagne (France)

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