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Titolo:
A BOX MODEL FOR NORTHEAST ATLANTIC COASTAL WATERS COMPARED WITH RADIOACTIVE-TRACERS
Autore:
NIELSEN SP;
Indirizzi:
RISO NATL LAB,POB 49 DK-4000 ROSKILDE DENMARK
Titolo Testata:
Journal of marine systems
fascicolo: 5-6, volume: 6, anno: 1995,
pagine: 545 - 560
SICI:
0924-7963(1995)6:5-6<545:ABMFNA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Nielsen, "A BOX MODEL FOR NORTHEAST ATLANTIC COASTAL WATERS COMPARED WITH RADIOACTIVE-TRACERS", Journal of marine systems, 6(5-6), 1995, pp. 545-560

Abstract

A box model for the estimation of doses to members of the public fromdischarges of radioactivity into North-East Atlantic coastal waters has been used to predict annual means of radionuclide seawater concentrations which have been compared with measured data of tracer radionuclides, Cs-137, Tc-99 and Sb-125. Discharges of these radionuclides intothe sea from the nuclear reprocessing plants Sellafield in the UK andLa Hague in France have been used as input to the model. Fallout of Cs-137 from atmospheric nuclear weapons tests and fallout of Cs-137 from the Chernobyl accident into the Baltic Sea have been taken into account. A large proportion of the measured data was collected during the CEC MAST-900052 project which is concerned with the utilization of radionuclides as tracers for water movements. The data cover the time period 1972-1992. A comparison between predicted and measured concentrations of radionuclides in seawater indicated the need to improve the model with respect to mixing conditions in the English Channel and water transport from the North Sea to the Baltic Sea via the Skagerrak, the Kattegat and the Belt Sea. Improvements were made using the data for Cs-137 and Tc-99 and involved adjustments of the mixing conditions (water exchange rates) between adjacent water boxes while keeping the net advective water fluxes of the model unaltered. The results of the modified version of the model have been compared with observed values. Thecomparison shows a somewhat better agreement for Cs-137 and Sb-125 than for Tc-99 which is believed to be due to the lower reliability of the Tc-99 discharge data from Sellafield in 1978. An analysis of the predicted-to-observed seawater concentrations indicates an overall predictive accuracy of the model of 0.9 corresponding to a 10% underestimation and a predictive precision of about a factor of 2.5 at a confidence level of 95%. The Sb-125 data, which are independent of the tuning of the model, support the general conclusions about the model predictions of radionuclide concentrations in seawater.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 06:59:17