An Analysis of Features of Surface Wind andAir Diffusion in Three Gorges Dam Area

The features of surface wind and air diffusion in the Three Gorges dam area is analysed according to the climatic viewpoint. The main results include that the average wind speed in the dam area is slightly greater than that in Yichang station, but Zigui station less distinctly; the wind normal speed is greater in winter and spring, and least in autumn; the calm in morning often appears in autumn and winter; the monsoon feature is not marked, but the wind daily variation distinct, that is to say, it is typical mountain and valley breeze. According to these features, the typical wind field charts in the day and night are given. By wind frequency analysis jointed air stability, it is found that the air diffusion direction pointed to the Changjiang River valley, therefore, the air pollution round this place will be aggravating. As a whole, the air diffusivity is lower in the dam area in autumn and winter.

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