从简化释放情景看自由对流层中放射性核素的垂直分布特征:案例研究

Xiangming Sun, K. Chung, Qiudan Dai
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引用次数: 0

摘要

对高空辐射剂量估算的研究不如对地面或边界层的研究多。然而,航空业的利益相关者需要对巡航水平的放射性烟羽影响进行合理估算。本研究旨在提供剂量的定量估算,以及估算在七天以内的扩散过程中的可靠性。利用拉格朗日大气弥散模型,对简化假设的放射性核素释放情况下放射性核素的垂直延伸进行定量估算。在北方冬季的情况下,选择不同纬度的辐射源进行模拟。研究了三种气象数据,以测试垂直羽流分布对驱动气象数据的敏感性。研究了空气中放射性核素浓度的垂直分布,并分析了相关的不确定性。结果发现,在垂直湍流速度起重要作用的地方,羽流的垂直延伸对所使用的气象数据很敏感。因此,有必要解决自由对流层中空气浓度或剂量的不确定性问题,在向利益相关者提供结果时必须谨慎。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The characteristics of the vertical distribution of radionuclide in free troposphere from simplified release scenarios: a case study
Dose estimation in the upper air is not studied as much as on ground level or in boundary layer. However, there is a need from stakeholders in aviation industry for a reasonable estimation of the radioactive plume impact at cruising levels. This study aims to provide a quantitative estimation of the dose and how reliable it is for dispersion processes up to seven days. A Lagrangian atmospheric dispersion model is used to estimate quantitively the vertical extension of radionuclides from simplified hypothetical radionuclide release scenarios. Sources at different latitudes are selected for simulation in a boreal winter case. Three meteorological data are examined to test the sensitivity of vertical plume distribution to driving meteorological data. The vertical distribution of air concentration of radionuclides is investigated and the associated uncertainties are analysed. It is found that the vertical extension of plumes is sensitive to meteorological data being used where vertical turbulent velocities play an important role. It is therefore necessary to address the uncertainties of air concentration or dose in the free troposphere and caution must be taken when providing the results to stakeholders.
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