• 关键词：大气扩散模拟系统  水雾扩散  湍能闭合  随机游动

• 基金项目：国家自然科学基金(No.49775257);中科院“九五”重点项目(KZ952S1405)部分资助

• 刘红年
• 南京大学大气科学系, 南京 210093

• 蒋维楣
• 南京大学大气科学系, 南京 210093

• 徐敏
• 南京大学大气科学系, 南京 210093

• 摘要：利用三维能量方程闭合大气边界层模式和随机游动扩散模式组成一个大气扩散实用模拟系统, 模式考虑了湍流夹卷、雾滴蒸发、重力沉降等物理过程, 模拟研究了水电站泄洪产生的水雾的扩散及其对环境相对湿度的影响.模拟结果表明, 中性层结条件下, 水雾扩散距离为2.58m, 水雾最远影响距离为1km左右, 使环境相对温度增加1%—3%.大气稳定度对水雾扩散有很大的影响, 不稳定情况下, 水雾扩散和影响范围较小, 但因水雾蒸发量大, 水雾扩散和影响涉及的垂直向范围较大, 中性情况下次之, 稳定情况下, 水雾扩散和影响距离较远, 但所及高度不大.模拟结果与部分实测资料比较, 符合甚好.

• Abstract：In this paper, a practical atmospheric diffusion simulation system which is composed of a 3D/PBL model with E-%ε% closure scheme and a random walk model was used to simulate the diffusion of water fog produced by flood discharging of hydropower station and its effects on humidity of environment. The process of gravitational settle、 entrainment and evaporation were considered. It showed that the distance of fog diffusion is about 258m and the humidity variation is 1%—3% in the region about 1km from the source under the neutral condition. The degree of stability has great influence on fog diffusion, under unstable condition the distance of fog diffusion is shorter, but the spread height of diffusion is higher than those under the neutral condition. Some of the result were compared with the data obtained from similar hydropower station.

• Key words：simulated system of atmospheric diffusion  fog diffusion the turbulence energy closure  random walk model

• 
  摘要点击次数： 1855 全文下载次数： 2724