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Multi-scenario validation of CALMET-RIMPUFF for local-scale atmospheric dispersion modeling around a nuclear powerplant site with complex topography

Authors :
Xinwen Dong
Sheng Fang
Shuhan Zhuang
Hong Li
Jianzhu Cao
Source :
Journal of environmental radioactivity.
Publication Year :
2020

Abstract

The CALMET-RIMPUFF is composed of the California Meteorological Model and the Riso Mesoscale PUFF model, which provides reļ¬ned atmospheric dispersion modeling for nuclear emergency response. Because the performance of an atmospheric dispersion model can be case-sensitive, a multi-scenario validation is important to understand a model's behavior and limits. In this study, a multi-scenario validation of CALMET-RIMPUFF was performed based on six wind tunnel experiments simulating a real China's nuclear powerplant site with complex topographies and dense buildings. The CALMET-RIMPUFF simulations were compared with the measurements of the vertical wind profiles, 2D ground wind and concentration fields, both qualitatively and quantitatively. The results demonstrate that the CALMET-RIMPUFF can simulate the ground-level wind with acceptable accuracies. For vertical wind profiles, the accuracies show high dependencies on the local topography and building layout. The simulated ground concentrations generally agree well with the measurements, though the plume axis showed slight discrepancies from the measurements in three cases. Because the CALMET-RIMPUFF lacks a building effect module, it shows noticeable discrepancies in the building area. However, such discrepancies do not propagate to the downwind mountainous and sea areas, which the accuracies are quite satisfactory. Thus, the CALMET-RIMPUFF is capable for local-scale modeling at this site.

Details

ISSN :
18791700
Database :
OpenAIRE
Journal :
Journal of environmental radioactivity
Accession number :
edsair.doi.dedup.....407e2b6b8955de876e0d7f8114e4e0b0