研究论文
吴涧,蒋维楣,王卫国.山区盆地大气湍流特征与污染扩散的数值试验[J].环境科学学报,2000,20(5):554-557
山区盆地大气湍流特征与污染扩散的数值试验
- A numerical simulation of atmospheric turbulence and diffusion over mountain area
- 基金项目：云南省自然科学基金(98D0020M)资助项目;云南省教委科研基金(9911121)资助项目
- 作者
- 单位
- 吴涧
- 1. 南京大学大气科学系, 南京 210093; 2. 云南大学地球科学系
- 蒋维楣
- 南京大学大气科学系, 南京 210093
- 王卫国
- 云南大学地球科学系
- 摘要：运用三维非静力大气动力学数值模式, 模拟了稳定、中性和不稳定3种层结下山区盆地的大气湍流和污染扩散特征.通过模拟认为, 在山区复杂地形条件下, 由风切变引起的机械湍流是湍流运动的主要形式之一, 它主要受风速的影响.同时, 在非中性层结下, 热力湍流也是湍流运动的主要形式之一.由于地形复杂和层结变化, 使得污染扩散与平原地区有较大差异, 在稳定层结条件下可以产生高浓度的污染.
- Abstract：A/3-D nonhydrostatic model with E-ε closure has been used to simulate the TKE structure and diffusion over mountain area under different stratifications.From the simulation, the vertical motion of air can be affected by statification, but the effect is less than that of teerain.It has been recongnized from the simulation that the shear energy production of TKE is important in turbulent motion under any stra.tification.The theomodynamic production of TKE is also important under nonneutral stratification.The shear production and the absolute value of the thermodynamic production under stable stratification are less than that of unstable stratification about 10 times.The maximum values of the shear and thermondynamic production items appear just on the ground, then they decrease with height just like line.The concentration of pollutant is the maximum under stable stratification and is the minimum under unstable stratification.
- Key words：mountain area turbulence pollution diffusion
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