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| 山谷地形流场和扩散的数值研究 | |
| 引用本文： | 吴涧,王卫国,蒋维楣.山谷地形流场和扩散的数值研究[J].高原气象,2001,20(2):140-147. |
| 作者姓名： | 吴涧 王卫国 蒋维楣 |
| 作者单位： | 1. 南京大学大气科学系,云南大学地球科学系, 2. 云南大学地球科学系, 3. 南京大学大气科学系, |
| 基金项目： | 云南省自然科学基金项目 (98D0 2 0M )，云南省教委科研基金项目 (991112 1)资助 |
| 摘 要： | 运用三维非表力E－ε闭合模式，模拟了山体和山谷地形下的流场、湍流场和不同位置低矮点源扩散的污染物浓度分布。发现在不稳定时湍能的热力产生率并非在任何位置都是主要的。当风速较大时，在山谷底部机械产生率也可能超过热力产生率。对污染扩散的分析表明：在近地面源条件下，稳定层结时如果出现小风，无论源在何处，都人造成一定范围内的严重污染，当污染源位于山前或山顶时，谷底的污染不剧烈。当污染源位于谷底时，无论何种层结、何种来流风速，都会造成山谷地区的严重污染。污染源位于山体沿来流方向的中心线上的谷底时，如果风速大，污染物沿回流输送；如果风速小，则沿来流方向输送。 |
| 关 键 词： | 湍流运动 回流 污染物浓度 山谷地形 流场 |
| 文章编号： | 1000-0534(2001)02-0140-08 |
| 修稿时间： | 1999年10月14 |
On the Numerical Simulation of Flow Field and Turbulent Diffusion over the Mountain and Valley Terrain |
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| WU Jian ,JIANG Wei mei ,WANG Wei guo.On the Numerical Simulation of Flow Field and Turbulent Diffusion over the Mountain and Valley Terrain[J].Plateau Meteorology,2001,20(2):140-147. | |
| Authors: | WU Jian JIANG Wei mei WANG Wei guo |
| Institution: | WU Jian 1,2,JIANG Wei mei 1,WANG Wei guo 2 |
| Abstract: | By using the numerical model with the E-ε closure the air stream, the motion of turbulence and the diffusion of three lower sources in different position has been simulated. It has been shown that the thermodynamic item in the TKE equation is not important anywhere, but the item of shear energy production is more important than the thermodynamic item in the valley when the wind speed is higher. It has been found also that the concentration at the bottom of valley is not so high, when the source is located on the top of mountain or before the mountain. The valley will be polluted seriously under any stratification if the source is located in the valley. When the source is located in the valley, the pollutant can be transferred with the backflow, if the wind speed is hight; also the pollutant can be transferred with the coming-flow, if the wind speed is lower. |
| Keywords: | Terrain of mountain and valley Turbulence motion Backflow Concentration of pollutant |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |