摘要
利用雾滴尺寸的Γ分布模型推导了雾滴谱特征与雾的含水量及能见度的关系 ,给出了利用毫米波衰减和能见度测量雾滴谱特征的方法 .根据雾的含水量与能见度的经验关系 ,对平流雾和辐射雾的雾滴谱特征进行了计算和分析 ,结果表明 ,平流雾的雾滴浓度随含水量的增加而增加 ,而辐射雾则相反 ,并且对于同等含水量 ,平流雾的雾滴浓度比辐射雾小约一个数量级 ,但其模式半径却要大得多 .最后利用所导出的雾滴谱得到了辐射雾的 10 6 μm和 11μm红外辐射衰减与含水量的线性关系 ,与实验结果有很好的一致性 .
The relations of the spectrum characteristics of the fog drop with its water content and visibility are deduced based on the Γ distribution model of its size. Then a method is developed for obtaining it from the attenuation measurements at millimeter band. The spectrum characteristics of advection and radiation are calculated and analyzed respectively according to the relations between the water content of fog and visibility, which shows that the fog drop density of advection is proportional to its water content but the opposite is true for the radiation, and for the same water content the density of advection drop is much less than that of radiation with its radius much longer. Finally the linear relation between attenuation and water content at 10 6?μm and 11?μm is obtained based on fog drop size distribution, which is in good agreement with experimental results.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2002年第2期253-256,共4页
Journal of Xidian University
基金
国家自然科学基金资助项目 ( 6 0 0 810 0 2 )
