【摘要】 利用UVW三轴风速仪三峡坛子岭单点地面风观测资料分析了三峡坝区地面风速量值、风向风速出现频率分布、风的日变化规律等 ,并根据这些观测资料、结合一些地形风理论知识和观测现象推测了三峡坛子岭附近地面风平面流场特征 ,从而揭示了河道地形回流风这一特殊小地形下的局地风现象。三峡坛子岭附近地面的这种回流风尺度在百米到千米量级 ,与由于地形热力因子引起的山地风不同 ,是由于小地形的动力作用引起的 ,其风向与长江河道引导的山地风相反。更多还原

【Abstract】 Based on observations of wind vector above Tanziling mountain of Three Gorges with a three dimensions anemocinemograph, the wind velocity, frequencies of velocity and direction and the daily variation in the areas are analyzed. Combining with the theories of orographic wind and some natural phenomenon,the horizontal characteristics of air flowing filed are given, so the riverway returning breeze is found. It emerged in a river channel around the basic flow if there is a special topographic form. This returning breeze in the areas has a hundred to thousand meter scale. It is different from mountain valley wind directed by Changjiang riverway that it is caused by orographic dynamical factor not by thermodynamical factor and has opposite direction.更多还原