Modelling the tidal dispersion of and in the English Channel

Periáñez, R.

doi:10.1016/s0265-931x(99)00125-3

Cited by 30 publications

(46 citation statements)

References 32 publications

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“…Note the different units for Pu characteristic times. For a conservative radionuclide, average transport velocity is about 3.5 km/day, in agreement with the previous estimation in [9] with a short-term dispersion model: 2.8 km/day. The velocities are significantly reduced for non-conservative radionuclides since water-sediment interactions make them less mobile.…”

Section: Radioprotectionsupporting

confidence: 90%

“…The model used to simulate the dispersion of non-conservative radionuclides in the English Channel is based upon some previous work [8][9][10]. The first two papers describe a model that simulates tideinduced dispersion of conservative and non-conservative, respectively, radionuclides in the Channel.…”

Section: Methodsmentioning

confidence: 99%

“…Water-sediment interactions are described using kinetic transfer coefficients [9,10]. As an example we can see some results of the new model, applied to simulate actual releases of 99 Tc and 125 Sb from La Hague, in Fig.…”

Section: Methodsmentioning

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: Radioprotectionsupporting

confidence: 90%

Section: Methodsmentioning

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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“…Parameters for the model have been obtained from literature. Details on these parameters and their values are described in detail in (2,5). In these references, it is also justified why different oxidation states for plutonium are not considered and colloids are neglected.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, k 1 also depends on the particle size since depends on the surface of particles per water volume unit (3). More details may also be seen in (5).…”

Section: Model Descriptionmentioning

confidence: 95%

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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The Enhancement of 226Ra in a Tidal Estuary due to the Operation of Fertilizer Factories and Redissolution from Sediments: Experimental Results and a Modelling Study

Periáñez¹

2002

Estuarine, Coastal and Shelf Science

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Modelling the tidal dispersion of and in the English Channel

Cited by 30 publications

References 32 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 the flux of radionuclides from the Rhone River into the Mediterranean Sea

The Enhancement of 226Ra in a Tidal Estuary due to the Operation of Fertilizer Factories and Redissolution from Sediments: Experimental Results and a Modelling Study

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