Modelling oxygen deficits in the Seine River downstream of combined sewer overflows

Even, Stéphanie; Poulin, Michel; Mouchel, Jean-Marie; Seidl, Martin; Servais, Pierre

doi:10.1016/j.ecolmodel.2003.08.019

Cited by 79 publications

(51 citation statements)

References 23 publications

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“…The important contribution of precipitation and snowmelt events to total annual DOC export has been documented (Ciaio and McDiffett 1990;Brown et al 1997;Hinton et al 1998;Volk et al 2002;Even et al 2004;Wellington and Driscoll 2004;Inamdar et al 2006;Saunders et al 2006), and recent observations indicate that the chemical composition and reactivity of soil-water and streamwater DOC changes markedly during rainfall and snowmelt (Easthouse et al 1992;Buffam et al 2001;Kaushal and Lewis 2003;Dalzell et al 2005Dalzell et al , 2007Volk et al 2005;Hood et al 2006;Vidon et al 2008). Although it is evident that hydrologic events (i.e., rainfall, snowmelt) serve as ''hot moments'' for the loss of labile carbon, organic-bound nutrients, and DOCassociated pollutants from the terrestrial landscape (McClain et al 2003), quantitative linkages between event-based DOC concentrations and stream discharge and other watershed characteristics have not been well elucidated.…”

Section: Introductionmentioning

confidence: 99%

Event controlled DOC export from forested watersheds

2010

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We performed a meta-data analysis to investigate the importance of event based fluxes to DOC export from forested watersheds. A total of 30 small eastern United States forested watersheds with no wetland component, with a total of 5,176 DOC and accompanying discharge measurements were used in this analysis. There is a clear increase in DOC concentration during hydrologic events (storms and snow melt) that follows a power relationship. We estimate that 86% of DOC is exported during events. The majority (70%) of this event based DOC flux occurs during the rising hydrograph and during large events. Events with a discharge greater than 1.38 cm day -1 make up only 4.8% of the annual hydrograph, yet are responsible for 57% of annual DOC flux. The relationship between event discharge and both DOC concentration and flux is also regulated by temperature and antecedent conditions, with a larger response in both fluxes and concentrations to events during warmer periods and periods where the preceding discharge was low. The temperature relationship also shows seasonality indicating a potential link to the size or reactivity of watershed OM pools. The 86% of DOC lost during events represents a conservative estimate of the amount of allochthonous forested DOC transported laterally to streams. Future research on watershed cycling of DOC should take into account the importance of events in regulating the transport of DOC to downstream ecosystems, determine the relative importance of abiotic versus biotic processes for the temperature regulation of eventassociated DOC fluxes, and elucidate the interactions between processes that respond to climate on event versus longer time scales.

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Section: Introductionmentioning

confidence: 99%

Event controlled DOC export from forested watersheds

2010

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“…Sewage effluents, for example, contain high loads of labile organic compounds. In this and other situations, microbial growth in aquatic environments can severely reduce local oxygen levels (Even et al 2004) and may also contribute to clogging of sediments (Battin and Sengschmitt 1999). These factors can be extremely stressful to exposed whitefish embryos (VentlingSchwank and Mu¨ller 1991), but they did not play a role during at least the first 24 hours of our experiment.…”

Section: Resultsmentioning

confidence: 99%

Elevated resource availability sufficient to turn opportunistic into virulent fish pathogens

Wedekind

Gessner

Vazquez

et al. 2010

Ecology

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Abstract. There is mounting evidence that organic or inorganic enrichment of aquatic environments increases the risk of infectious diseases, with disease agents ranging from helminth parasites to fungal, bacterial, and viral pathogens. The causal link between microbial resource availability and disease risk is thought to be complex and, in the case of so-called ''opportunistic pathogens,'' to involve additional stressors that weaken host resistance (e.g., temperature shifts or oxygen deficiencies). In contrast to this perception, our experiment shows that the link between resource levels and infection of fish embryos can be very direct: increased resource availability can transform benign microbial communities into virulent ones. We find that embryos can be harmed before further stresses (e.g., oxygen depletion) weaken them, and treatment with antibiotics and fungicides cancels the detrimental effects. The changed characteristics of symbiotic microbial communities could simply reflect densitydependent relationships or be due to a transition in life-history strategy. Our findings demonstrate that simple microhabitat changes can be sufficient to turn ''opportunistic'' into virulent pathogens.

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“…Ils provoquent un changement souvent brutal du régime hydraulique du cours d'eau récepteur, entraînant des effets érosifs sur les berges ainsi que la remise en suspension des sédiments. De plus, les RUTP contribuent à de nombreux apports dans les milieux récepteurs altérant ainsi la qualité des eaux : des apports de matières en suspension augmentant la turbidité du milieu (GUPTA et SAUL, 1996;SEIDL et al, 1998a); d'eaux fortement désoxygénées, voire totalement désoxygénées, entraînant une chute immédiate du taux d'oxygène dissous (EVEN et al, 2004;HVITVED-JACOBSEN, 1982); de matières organiques biodégradables, qu'elles soient sous forme dissoute, adsorbée ou particulaire, entraînant également une consommation rapide de l'oxygène dissous (GRAY, 2004;HARREMOËS, 1982;SEIDL et al, 1998b); d'ions ammonium, éventuellement transformés en ammoniac, forme chimique toxique selon le pH (MULLISS et al, 1997); de micro-polluants organiques et minéraux (BORDEN et al, 2002;DAVIS et al, 2001;GRAY, 2004;HALL et al, 1998;LEE et BANG, 2000;PITT et al, 1995;SUAREZ et PUERTAS, 2005); et de bactéries pathogènes (IRVINE et al, 2005;QURESHI et DUTKA, 1979;SEIDL et al, 1998a MULLISS et al, 1994).…”

Section: Effets Sur Les Composantes Physico-chimiques Des Milieux Aquunclassified

Impacts des rejets urbains de temps de pluie (RUTP) sur les milieux aquatiques : État des connaissances

Parent-Raoult

Boisson

2007

rseau

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En milieu urbain, les flux générés par la pluie peuvent transporter vers les hydrosystèmes une partie des éléments polluants accumulés par temps sec et issus des diverses activités humaines. Ces flux polluants sont qualifiés de « rejets urbains par temps de pluie » (RUTP). Les études menées depuis les années 1960 ont permis d’identifier le problème en évaluant l’origine des polluants, les ordres de grandeur des concentrations et les flux émis. Les RUTP présentent un caractère épisodique, mais peuvent avoir des effets de nature chronique, liés à la répétition des phénomènes. Ils peuvent altérer les différentes composantes des milieux récepteurs : composantes physiques (e.g. modification des écoulements, de la morphodynamique), chimiques (e.g. apports de matières en suspension, fertilisants, micropolluants), biologiques (e.g. sélection des espèces, toxicité, bio-accumulation) et l’hydrosystème dans sa globalité (e.g. eutrophisation). L’intégration d’une caractérisation biologique dans l’évaluation des impacts est reconnue depuis peu, et il existe relativement peu de travaux prenant en compte cette composante. La complexité des rejets (e.g. caractère intermittent, variabilité spatio-temporelle) et la diversité des milieux récepteurs font qu’il est difficile de dresser un bilan exact des impacts. Une approche intégrée, ou holistique, est aujourd’hui préconisée prenant en compte : des descripteurs physico-chimiques, des critères de qualité du milieu (eau et sédiments), de l’habitat, du régime hydraulique, des communautés biologiques autochtones, et des données toxicologiques. Toutefois, une telle approche est difficile à mettre en oeuvre et les travaux s’appuient généralement sur des approches plus simples : études de laboratoire ou de terrain ou combinant les deux.Urbanization greatly disturbs different ecosystems and particularly affects aquatic ecosystems during wet weather. Runoff can transport some of the pollutants accumulated during dry weather towards aquatic ecosystems along with the waste produced by numerous human activities (transport, industry, etc.). These flows of pollution, commonly called «urban wet weather flows», not only affect the physical, chemical and biological properties of receiving aquatic systems, but also modify the intended use of the water. The need to provide a solution to this problem explains the current increase in the number of studies devoted to the environmental impact of urban storm water.Urban wet weather flow studies began in the 1960’s and have permitted the assessment of the sources of pollutants, the order of magnitude of their concentrations and their loads produced. Urban storm-water pollutants are numerous and are of various origins: sewer system cleansing (scoured particles deposited during dry weather); rain wash-out of atmospheric gases and dusts (nitrogen oxides, carbon monoxide, sulphur dioxide, hydrocarbon vapours, trace metals, aerosols, etc.); rainfall on roofs (copper, zinc, lead); and rain runoff from urban areas and waterproofed surfaces, which are covered with...

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Modelling oxygen deficits in the Seine River downstream of combined sewer overflows

Cited by 79 publications

References 23 publications

Event controlled DOC export from forested watersheds

Event controlled DOC export from forested watersheds

Elevated resource availability sufficient to turn opportunistic into virulent fish pathogens

Impacts des rejets urbains de temps de pluie (RUTP) sur les milieux aquatiques : État des connaissances

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