Effect of mixing on microbial communities in the Rhone River plume

Naudin, Jean-Jacques; Cauwet, Gustave; Fajon, Céline; Oriol, L.; Terzić, Senka; Devenon, Jean‐Luc; Broche, P.

doi:10.1016/s0924-7963(01)00004-5

Cited by 49 publications

(61 citation statements)

References 55 publications

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“…Measured particle concentrations, from (6,7), are also shown. It can be seen that there is a good agreement between measured and computed suspended particle concentrations.…”

Section: Resultsmentioning

confidence: 99%

Modelling the flux of radionuclides from the Rhone River into the Mediterranean Sea

Periáñez¹

2005

Radioprotection

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Abstract.A numerical model has been developed to simulate the input of radionuclides into the Mediterranean Sea through the Rhone River plume. The model is fully 3D. It solves the hydrodynamic equations, which include baroclinic terms and a turbulence model, together with the suspended sediment equations and radionuclide dispersion equations. The suspended sediment sub-model includes four particle classes, settling and deposition. The radionuclide equations include the exchanges of radionuclides between water, suspended sediments and bed sediments, described using a kinetic model. The effect of salinity changes upon uptake kinetics has also been included. Computed water circulation, salinity pattern, suspended sediment distribution and sedimentation rates are in agreement with observations in the area. The model has been applied to simulate the dispersion of 137 Cs and 239,240 Pu through the plume. Computed specific activities in water, suspended matter and bottom sediments are in agreement with the measured distributions. The model can also be applied to calculate distribution coefficients. Although some water circulation models for the Rhone River plume exist in current literature, this is the first time in which a detailed hydrodynamic and suspended sediment model has been applied to simulate the dispersion of radionuclides in the plume.

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“…Measured particle concentrations, from (6,7), are also shown. It can be seen that there is a good agreement between measured and computed suspended particle concentrations.…”

Section: Resultsmentioning

confidence: 99%

Modelling the flux of radionuclides from the Rhone River into the Mediterranean Sea

Periáñez¹

2005

Radioprotection

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“…1). En todas las estaciones las muestras de agua se tomaron a nivel superficial a excepción de la zona del emisor donde se muestreo a profundidades de 0, -0.5, -1.0 y -5.0 m, utilizando un muestreador de acuerdo a Naudin et al (2001). Para cada muestra se tomaron 500 mL de agua en botellas de vidrio Pyrex con tapón de rosca, previamente esterilizadas en autoclave a 121ºC durante 15 min.…”

Section: Recolecta Y Análisis De Las Muestrasunclassified

“…1). Surface water samples were collected at all the stations, but in the area of the sewage outfall, samples were also taken at depths of -0.5, -1.0 and -5.0 m, according to Naudin et al (2001). For each sample, 500 mL of water were collected in screw-cap Pyrex bottles, previously sterilized by autoclave at 121ºC for 15 min.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Bacteriological quality of the seawater in Cullera Bay, Spain

et al. 2006

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IntroducciónLa degradación de la calidad de las aguas costeras puede tener diversas causas. Aunque posiblemente la principal sea el tratamiento inadecuado de aguas residuales (urbanas, industriales y agrícolas) su vertido en la costa a través de emisores IntroductionThe degradation of coastal water quality can be attributed to several factors, though the main one probably is the inappropriate treatment of the urban, industrial and agricultural wastewaters discharged into the sea through sewage outfalls Distribución bacteriológica en el agua de mar en la Bahía Cullera, España ResumenLocalizada en el Mediterráneo español, la Bahía de Cullera está influenciada por las descargas del Río Júcar y por un emisor submarino que descarga sus aguas residuales justo en la desembocadura del río. En el marco del proyecto ECOSUD se llevaron a cabo cinco campañas de muestreo entre julio de 2002 y abril de 2003, en 11 estaciones distribuidas a lo largo de la costa y en el emisor submarino, para determinar la distribución espaciotemporal de la calidad bacteriológica (coliformes fecales, Escherichia coli y enterococos) del agua de mar con la finalidad de detectar posibles áreas peligrosas para usos recreativos y de baño de las playas de la bahía, según los estándares determinados por la Comisión Ambiental Europea. Los resultados obtenidos muestran que, en general, la zona costera de Bahía Cullera mantiene una buena calidad en sus aguas de baño. Sin embargo, la influencia de las descargas tanto del emisario submarino como del Río Júcar tiene un impacto en la zona costera, donde el aumento de la concentración bacteriológica disminuye la calidad de las aguas, sobretodo en los meses de verano cuando la actividad turística es intensa. El aporte adicional de fuentes esporádicas de contaminación en la zona del Cabo Cullera ocasiona un incremento por encima del valor máximo permisible de concentración de bacterias (2000 UFC 100 mL -1 para coliformes fecales, 200 UFC 100 mL -1 para enterococos y 500 UFC 100 mL -1 para E. coli). Además, tomando en cuenta que el patrón de corrientes está controlado por el régimen estacional de los vientos, la zona norte podría llegar a ser una futura fuente adicional de bacterias contaminantes a las zonas de la playa, que hasta hoy mantienen una buena calidad de agua.Palabras clave: calidad del agua, indicadores ambientales, Cullera, Río Júcar. AbstractCullera Bay, located on the Mediterranean coast of Spain, is influenced by the Júcar River outflow and by an sewage outfall that discharges wastewaters in the vicinity of the river mouth. Within the framework of the ECOSUD project, five sampling campaigns were conducted between July 2002 and April 2003 at 11 stations distributed along the coast of the bay and in the area of the sewage pipe, in order to determine the spatial and temporal distribution of bacteria (faecal coliforms, enterococci and Escherichia coli) in the seawater and thus detect possible dangerous zones for recreational use of the beaches, based on the guidelines established by the European Env...

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“…Fresh water inputs in the gulf vary throughout the year, with peaks in rainy seasons, generally spring and fall (Moutin et al, 1998), but the main input is the Grand Rhône river plume (Petrenko et al, 2005), whose direction and extent are greatly affected by the wind (Demarq and Wald, 1984;Estournel et al, 2001;Marsaleix et al, 1998;Naudin et al, 2001). The plume sometimes extends all the way to the Spanish coast (Castellon et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

Shallow gas off the Rhône prodelta, Gulf of Lions

et al. 2006

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In areas unaffected by the high flux of organic matter and rapid/thick flood deposition, or in between flood events, the conditions for methanogenesis and gas accumulation have not been met. In these areas, the physical and biological reworking of the surficial sediment may effectively oxidize and mineralize organic matter and limit bacterial methanogenesis in the subsurface. We propose that in the Rhône prodelta flood deposits deliver significant amounts of terrigenous 1 organic matter that can be rapidly buried, effectively removing this organic matter from aerobic oxidation and biological uptake, and leading to the potential for methanogenesis with burial.

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Effect of mixing on microbial communities in the Rhone River plume

Cited by 49 publications

References 55 publications

Modelling the flux of radionuclides from the Rhone River into the Mediterranean Sea

Modelling the flux of radionuclides from the Rhone River into the Mediterranean Sea

Bacteriological quality of the seawater in Cullera Bay, Spain

Shallow gas off the Rhône prodelta, Gulf of Lions

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