Spatial and Temporal Distribution (1987-91) of 125Sb Used to Trace Pathways and Transit Times of Waters Entering the North Sea from the English Channel

Guegueniat, P.; Bois, Pascal Bailly du; Gandon, R.; Salomon, Jean-Claude; Baron, Y.; Leon, Ricardo De

doi:10.1006/ecss.1994.1049

Cited by 34 publications

(14 citation statements)

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“…Data processing, calibration of the XCTDs and SBE-19 CTD surface casts, and detailed interpretations of the hydrographic results are reported by Steele and Boyd [1998] 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 Year Figure 2. Guegueniat et al, 1994Guegueniat et al, , 1997. As a result, the 1291/137Cs atom ratio ( Figure 2) generally remained in the range of 40-70 from 1970 to 1986 following its initial increase from fallout levels of <10 in the early 1960s.…”

Section: Methodsmentioning

confidence: 93%

Circulation features in the central Arctic Ocean revealed by nuclear fuel reprocessing tracers from Scientific Ice Expeditions 1995 and 1996

Smith¹,

Ellis²,

Boyd³

1999

J. Geophys. Res.

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Section: Methodsmentioning

confidence: 93%

Circulation features in the central Arctic Ocean revealed by nuclear fuel reprocessing tracers from Scientific Ice Expeditions 1995 and 1996

Smith¹,

Ellis²,

Boyd³

1999

J. Geophys. Res.

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“…Antimony 125, nearly absent from other sources and conservative in seawater, is the reference marker to identify the water plume labelled by the La Hague plant. It clearly shows the dispersion of these releases in the English Channel and the North Sea Guéguéniat et al, 1993 ;Guéguéniat et al, 1994 ;Bailly du Bois et al, 1993 ;Bailly du Bois et al, 1995).…”

Section: Radiolabelling From La Haguementioning

confidence: 91%

Quantitative assessment of dissolved radiotracers in the English Channel: Sources, average impact of la Hague reprocessing plant and conservative behaviour (1983, 1986, 1988, 1994)

Bois

Guegueniat²

1999

Continental Shelf Research

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Knowledge of long-term movements of water-masses in the English Channel has been substantially improved using hydrodynamic modelling coupled with radio-tracers studies ; nevertheless, the precision of results so obtained is still largely dependent on measurement precision.New tools are now available to make more accurate determinations of radio-tracer distribution : -Repositioning of station locations at the same tide reference-time, giving a homogeneous spatial data set, coupled with the possibility of interpolating and quantifying the amounts of dissolved radioactivity flowing through the English Channel ;-The first measurements of tritium ( 3 H) in seawater on a large scale in the English Channel demonstrate that this fully conservative radionuclide is a clearly identifiable marker of industrial releases ;-Recent campaigns carried out during the FluxManche II CCE (1994) programme show the general distribution of dissolved radionuclides 137 Cs, 134 Cs, 60 Co, 125 Sb, 106 Ru and 3 H in the English Channel and the Irish Sea ;-The re-utilisation of data from previous campaigns (1983, 1986 and 1988) provides indications, at any given location in the English Channel, about the average dilution and distribution of releases derived from the La Hague reprocessing plant.Excesses and losses of radionuclides are now quantified with respect to known source-terms ; estimates of losses are provided for non-conservative radionuclides, while an excess of 137 Cs was observed in the English Channel during the period 1983 -1994. This excess which has the same order of magnitude as the quantities released from La Hague plant in the English Channel, could be explained by about 1% of Sellafield reprocessing plant releases entering the Channel.These results confirm and give a more detailed picture of the previously known distribution of water masses in the English Channel. They lead to clear information about transit times and dilution at this scale, and provide directly comparable data for the validation of hydrodynamic models.

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“…Using the general theory of the age, Delhez and Deleersnijder [2] obtained a value of about 4 months. The transit time of 125 Sb from La Hague to Dover has also been estimated from measurements [3], resulting in the range 2-8 months. The transit time of non-conservative radionuclides increases since adsorption to sediments makes these radionuclides less mobile in the aquatic environment.…”

Section: Resultsmentioning

confidence: 99%

“…Many published works concern the determination of time-scales for different systems as the atmosphere, ground waters, rivers, estuaries and the sea [1][2][3][4][5][6]. Outputs from some numerical experiments carried out with the model have been processed using time-series analysis techniques to calculate characteristic times of the system, transport velocities and dispersion factors.…”

Section: Introductionmentioning

confidence: 99%

Time scales for conservative and non-conservative radionuclide transport in the English Channel

Periáñez

Miró

2009

Radioprotection

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Abstract.A numerical model that simulates the dispersion of radionuclides in the English Channel has been applied to study the dispersion of conservative and non-conservative radionuclides released from La Hague nuclear fuel reprocessing plant. The model is based upon previous work and now is able to simulate dispersion over long time scales (decades), explicitly including transport by instantaneous tidal currents and variable wind conditions. Wind conditions are obtained from meteorological statistics using a stochastic method. Outputs from the model are treated using time-series analysis techniques. These techniques allow the determination of characteristic times of the system, transport velocities and dispersion factors. This information may be very useful to support the decision-making process after an emergency situation. Thus, we are proposing that time-series analysis can be integrated with numerical modelling for helping decision-making in response to an accident. The model is first validated through its application to actual releases of 99-Tc and 125-Sb, and characteristic times for several radionuclides (a conservative one, 137-Cs and 239,240-Pu) are given next. Characteristic transport velocities and dispersion factors have been calculated as well.

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Spatial and Temporal Distribution (1987-91) of 125Sb Used to Trace Pathways and Transit Times of Waters Entering the North Sea from the English Channel

Cited by 34 publications

References 0 publications

Circulation features in the central Arctic Ocean revealed by nuclear fuel reprocessing tracers from Scientific Ice Expeditions 1995 and 1996

Circulation features in the central Arctic Ocean revealed by nuclear fuel reprocessing tracers from Scientific Ice Expeditions 1995 and 1996

Quantitative assessment of dissolved radiotracers in the English Channel: Sources, average impact of la Hague reprocessing plant and conservative behaviour (1983, 1986, 1988, 1994)

Time scales for conservative and non-conservative radionuclide transport in the English Channel

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