近地面光学湍流估算与测量  

Estimation and Measurement of the Optical Turbulence over Land

作　　者：何武光[1] 吴健[1] 杨春平[1] 韩勇[1] 徐光勇[1] 

机构地区：[1]电子科技大学光电信息学院,成都610054

出　　处：《电子科技大学学报》2008年第6期893-896,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(10376007)

摘　　要：根据Monin-Obkhov相似理论,建立了近地面大气估算和预测模型,并进行了数值分析。与其他基于相似理论的估算模型对比结果表明,在不稳定条件下利用气象要素和一些经验参数估算近地面平坦地形光学湍流,理论估计和实验结果符合较好,在低风速时折射率结构常数随风速增加而减小。利用Thiermann-Kohnle模型,结合地理位置和太阳辐射规律,预测了某地某时段的光学湍流,并通过实地测量气象数据估测了折射率结构常数和湍流内尺度。A model for estimating and predicting the optical turbulence in the surface layer over land is presented based on Monin-Obukhov similarity theory, and some numerical analyses are carried out in comparison with other models. It is found that under unstable conditions, the optical turbulence over land with flat terrain can be well estimated by using standard meteorological parameters and some experiential data. The estimated result shows that the model is in good agreement with the measurements. When wind speed is low, the turbulence intensity （represented by refractive-index structure constant） becomes weaker with the stronger wind. The optical turbulence of some day and year is predicted with the Thiermann-Kohnle model by using geographic information and solar irradiance regularity. Finally, the refractive-index structure constant and inner scale are estimated using meteorological data measured on the spot.

关 键 词：气象要素 光学湍流 折射率结构常数 相似理论 近地面 

分 类 号：TN21[电子电信—物理电子学]