A 2D long term advection—dispersion model for the Channel and southern North Sea Part B: Transit time and transfer function from Cap de La Hague

Salomon, Jean-Claude; Breton, Marguerite; Guegueniat, P.

doi:10.1016/0924-7963(95)00021-g

Cited by 54 publications

(27 citation statements)

References 7 publications

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“…The transit time from La Hague to Dover is 75 days for a conservative radionuclide. This value compares with previous calculations of about 3 months [4]. Using the general theory of the age, Delhez and Deleersnijder [2] obtained a value of about 4 months.…”

Section: Resultssupporting

confidence: 81%

“…The transit time of the radionuclide patch from the source to a given point is defined as well. It is determined from the cross-correlation function of the time-series of radionuclide concentrations at the source and the point of interest [4]. Some characteristic times have also been defined for the bed sediments.…”

Section: Methodsmentioning

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%

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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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Section: Resultssupporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Periáñez

Miró

2009

Radioprotection

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“…R m (t) is assumed to be proportional to a lagged moving average, chosen to smooth the noise in discharges. They also used an alternative, theoretical weighting, derived from a model described by Salomon et al (1995). Similarly Masson et al (1995) used a three-point moving average, and attempted to remove seasonal effects by de-trending the time series of observations.…”

Section: Statistical Modelmentioning

confidence: 99%

Modelling 99Tc concentrations in Fucus vesiculosus from the north-east Irish Sea

Nawakowski¹,

Nicholson²,

Kershaw³

et al. 2004

Journal of Environmental Radioactivity

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“…The results obtained with the 125 Sb and a model of residual currents during previous work have overall agreed clearly with the calculated and measured results. The average distribution of the radionuclides measured and observed has been reproduced at the scale of the Channel and the North Sea [4] [5] [6]. However, a significant discrepancy has appeared between the assessments of calculated and measured radionuclides and in the spatial spread of the plumes marked at a given date.…”

Section: Introductionmentioning

confidence: 99%

TRANSMER, hydrodynamic model for medium- and long-term simulation of radionuclides transfers in the English Channel and southern North Sea

Bailly¹,

Dumas²

2005

Radioprotection

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Abstract. TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. This model evaluates the medium-and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year). It has been qualitatively and quantitatively validated by 1400 measurements of 125 Sb in seawater in the English Channel and the North Sea. Budgets of measured and simulated radionuclide quantities are balanced for theses seas. The correlation factor between individual measurements in seawater and calculation results is 0.88 with an average error of ± 54%, the error attributable to the measurement process being 15% on average. TRANSMER appears as a robust tool for modelling medium-and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions.

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A 2D long term advection—dispersion model for the Channel and southern North Sea Part B: Transit time and transfer function from Cap de La Hague

Cited by 54 publications

References 7 publications

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

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

Modelling 99Tc concentrations in Fucus vesiculosus from the north-east Irish Sea

TRANSMER, hydrodynamic model for medium- and long-term simulation of radionuclides transfers in the English Channel and southern North Sea

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