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Report No.

Improvement of Worldwide version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI), 2; Evaluation of numerical models by $$^{137}$$Cs deposition due to the Chernobyl nuclear accident

Terada, Hiroaki  ; Chino, Masamichi

The prediction performance of WSPEEDI (Worldwide version of System for Prediction of Environmental Emergency Dose Information), which consists of the atmospheric dynamic model MM5 and the Lagrangian particle dispersion model GEARN-new, is evaluated by measurements of precipitation and surface deposition of $$^{137}$$Cs over Europe during the Chernobyl accident. It is concluded that MM5/GEARN-new can predict $$^{137}$$Cs deposition distribution with good accuracy when accurate precipitation is predicted by using a explicit scheme on cloud microphysics with ice phase processes. High-resolutional calculation is also conducted for the area surrounding Chernobyl by a nesting method. MM5/GEARN-new can predict quite a realistic distribution of $$^{137}$$Cs deposition around Chernobyl which was not calculated by the previous version.



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Category:Nuclear Science & Technology



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