Environmental diffusion

环境扩散

• 批准号: 7527-2007
• 负责人: Sullivan, Paul
• 金额: $ 0.95万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=389535
• 关键词: Environmental; diffusion

When a gas, which may be malodorous, flammable or toxic, is released into the atmospheric boundary-layer one would like to know the probable concentration values encountered at various locations and times. These concentration values are very difficult to predict or to measure.The environment is in a turbulent state and the very irregular values of concentration recorded in field (and also in laboratory) measurements commonly exhibit extreme excursions of concentration that are many times the nominal average level. The usual descriptor used for the quantification of concentration values is the probability density function however this is impractical in the environmental context.

当一种可能是恶臭、易燃或有毒的气体被释放到大气边界层时，人们希望知道在不同地点和时间遇到的可能浓度值。这些浓度值很难预测或测量，环境处于湍流状态，在现场（以及实验室）测量中记录的非常不规则的浓度值通常显示出浓度的极端偏移，是标称平均水平的许多倍。用于浓度值的量化的通常描述符是概率密度函数，然而这在环境背景下是不切实际的。