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分析了合肥一水库边，近地面大气折射率结构常数Ｃ~２_ｎ的观测结果。表明Ｃ２ｎ的水平分布和时间变化与气象条件有关，是近地面热量平衡变化的结果。由于大面积大热容量水体的存在，使Ｃ~２_ｎ的变化有复杂多样的特点。得到了用气象要素，即气温、云量加上太阳高度分别估算近湖面和近地面Ｃ~２_ｎ的经验公式。提出了估算复杂地形Ｃ~２_ｎ的方法。
The observation results of the refractive index structure constant C ~ 2_n near the surface of Hefei-I reservoir are analyzed. The results show that the horizontal distribution and time variation of C2n are related to the meteorological conditions and are the result of the near-surface heat balance change. Due to the existence of a large area of large heat capacity of water, so that changes in C ~ 2_n complex and diverse characteristics. The empirical formula for estimating C ~ 2_n near the lake surface and the near ground with meteorological elements, namely, temperature, cloudiness plus the height of the sun, was obtained. A method of estimating complex terrain C ~ 2_n is proposed.