| 扩散参数的不确定性及其对扩散因子的影响 |
| 摘要点击 999 全文点击 1179 投稿时间：1997-07-11 |
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| 中文关键词 大气扩散 扩散参数 扩散因子 不确定度 |
| 英文关键词 atmosphere diffusion diffusion parameter diffusion factor uncertainty |
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| 中文摘要 |
| 根据联邦德国卡尔斯鲁厄核研究中心(KfK)31次示踪实验(排放高度为60m)结果,定量估算了高架源、大粗糙度地形条件下,各类天气相应的扩散参数的不确定度。发现同一地点、同一天气类型,扩散参数实测值相差可达二个量级,σy的不确定度随天气类型由A至F类而变大。采用拉丁超立方取样方法估算了上述扩散参数不确定度实测值所导致的小时轴向扩散因子(从而导致空气浓度及吸入剂量等)的不确定度。在F类天气,扩散因子值相差可达4个数量级。图示了各类天气条件下扩散因子不确定度随下风距离的变化关系。 |
| 英文摘要 |
| This paper estimates quantitatively uncertainty of diffusion parameters for various atmospheric stability under the condition of elevated release and large roughness based on the result of 31 tracer experiments(release hight of 60m)completed by Karlsruhe Nuclear Research Center(KfK),Germany.It could be seen that the difference of measuring values of diffusiotn parameter is able to reach 2 orders of magnitude even if in the same site and the same atmospheric stability.The uncertainty of σy increases with stability from A to F.The uncertainty of hour axial diffusion factor (and so air concentration) caused from above uncertainty of measuring values of diffusion parameter is estimated by using Latin Hypercube Sample(LHS) method.For F stability the difference of diffusion factor can reach 4 orders of magnitude.The relation between the uncertainty of diffusion factor and downwind distance under various atmospheric stability condition is shown by figures. |
