The particulate 7Be/210Pbxs and 234Th/210Pbxs activity ratios as tracers for tidal-to-seasonal particle dynamics in the Gironde estuary (France): Implications for the budget of particle-associated contaminants

Saari, Hanna-Kaisa; Schmidt, Sabine; Castaing, Patrice; Blanc, Guillaume; Sautour, Benoît; Masson, Olivier; Cochran, J. Kirk

doi:10.1016/j.scitotenv.2010.07.017

Cited by 48 publications

(98 citation statements)

References 46 publications

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“…1); in contrast, during high fluvial discharge (December-May) the TMZ moves down-estuary (between stations PK30 and PK67; Fig. 1) (Allen et al, 1977;Saari et al, 2010). TMZ particles present a low particulate organic carbon content (POC, 1.5 ± 0.1 %) and lability (Etcheber et al, 2007).…”

Section: The Gironde Fluvial-estuarine Systemmentioning

confidence: 99%

“…1). Due to a strong marine influence, the residence times of water and suspended particulate matter (SPM) are long, leading to a well-developed turbidity maximum zone (TMZ), with SPM concentrations up to few g L −1 (Allen et al, 1977(Allen et al, , 1980Jouanneau et al, 1999;Saari et al, 2010). The Gironde Estuary was estimated to contribute 60% of the input of fine sediments to the continental shelf of the Bay of Biscay (Castaing and Allen, 1981).…”

Section: Introductionmentioning

confidence: 99%

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Monitoring water quality in estuarine environments: lessons from the MAGEST monitoring program in the Gironde fluvial-estuarine system

Etcheber

Schmidt

Sottolichio

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. The Gironde Estuary, one of the largest European ones, presents temporary low dissolved oxygen content in its fluvial section close to the Bordeaux urban area. In a context of population growth and of long-term environmental changes, the development of a high-frequency monitoring programme of the fluvial-estuarine system of the Gironde, called MAGEST (MArel Gironde ESTuary), had appeared essential to address current and future water-quality issues/evaluations. The objectives of the MAGEST survey program are to establish a reference database to improve the knowledge of the Gironde Estuary functioning, encompassing the aspects of hydrology, sediment dynamics and biogeochemistry. Through examples of results from intratidal to seasonal time scales, we demonstrate how such a long-term, high-frequency monitoring of a fluvio-estuarine system is of valuable interest to extract the main trends of its functioning and of the water quality in relation to external forcings (climatology, urban wastes, land use, . . . ) and to predict the future evolution of an estuary with global and environmental changes.

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Section: The Gironde Fluvial-estuarine Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monitoring water quality in estuarine environments: lessons from the MAGEST monitoring program in the Gironde fluvial-estuarine system

Etcheber

Schmidt

Sottolichio

et al. 2011

Hydrol. Earth Syst. Sci.

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“…Estuarine suspended sediments have a dominant terrestrial origin and are mainly composed of clays (45-65 %) and silts (Fontugne and Jounneau, 1987). SPM residence time is between 12 and 24 months, depending on river discharge (Saari et al, 2010). Freshwater inflow moves the TMZ along the estuary axis: during high river flow the TMZ moves down-estuary and vice versa (Castaing and Allen, 1981).…”

Section: The Study Sitementioning

confidence: 99%

Turbidity in the fluvial Gironde Estuary (southwest France) based on 10-year continuous monitoring: sensitivity to hydrological conditions

Jalón‐Rojas

Schmidt

Sottolichio

2015

Hydrol. Earth Syst. Sci.

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Abstract. Climate change and human activities impact the volume and timing of freshwater input to estuaries. These modifications in fluvial discharges are expected to influence estuarine suspended sediment dynamics, and in particular the turbidity maximum zone (TMZ). Located in southwest France, the Gironde fluvial-estuarine system has an ideal context to address this issue. It is characterized by a very pronounced TMZ, a decrease in mean annual runoff in the last decade, and it is quite unique in having a long-term and highfrequency monitoring of turbidity. The effect of tide and river flow on turbidity in the fluvial estuary is detailed, focusing on dynamics related to changes in hydrological conditions (river floods, periods of low discharge, interannual changes). Turbidity shows hysteresis loops at different timescales: during river floods and over the transitional period between the installation and expulsion of the TMZ. These hysteresis patterns, that reveal the origin of sediment, locally resuspended or transported from the watershed, may be a tool to evaluate the presence of remained mud. Statistics on turbidity data bound the range of river flow that promotes the upstream migration of TMZ in the fluvial stations. Whereas the duration of the low discharge period mainly determines the TMZ persistence, the freshwater volume during high discharge periods explains the TMZ concentration at the following dry period. The evolution of these two hydrological indicators of TMZ persistence and turbidity level since 1960 confirms the effect of discharge decrease on the intensification of the TMZ in tidal rivers; both provide a tool to evaluate future scenarios.

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“…Scientific developments are presently focussing on testing additional radionuclides, such as beryllium-7 ( 7 Be) and thorium-234 ( 234 Th) (e.g. Blake et al 1999;Saari et al 2010), and in developing new tracers, such as rare earth elements (REE) and natural and artificial fluorescence (e.g. Polyakov and Nearing 2004;Granger et al 2007Granger et al , 2011Stevens and Quinton 2008;Spencer et al 2011).…”

Section: Sediment Tracing and Fingerprintingmentioning

confidence: 99%

Recent advances and future directions in soils and sediments research

Owens

2011

J Soils Sediments

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The particulate 7Be/210Pbxs and 234Th/210Pbxs activity ratios as tracers for tidal-to-seasonal particle dynamics in the Gironde estuary (France): Implications for the budget of particle-associated contaminants

Cited by 48 publications

References 46 publications

Monitoring water quality in estuarine environments: lessons from the MAGEST monitoring program in the Gironde fluvial-estuarine system

Monitoring water quality in estuarine environments: lessons from the MAGEST monitoring program in the Gironde fluvial-estuarine system

Turbidity in the fluvial Gironde Estuary (southwest France) based on 10-year continuous monitoring: sensitivity to hydrological conditions

Recent advances and future directions in soils and sediments research

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