忽略本底对污染物扩散数值计算精度的影响  

Impact of Ignoring Background to the Accuracy of Pollutant Diffusion Calculation

作　　者：陈翔 陈江海 CHEN Xiang;CHEN Jianghai(Shanghai Investigation,Design and Research Institute,Shanghai 200434,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434

出　　处：《人民珠江》2018年第11期128-133,共6页Pearl River

基　　金：太湖生态水动力模拟与水环境提升技术(2016YFC0401504)

摘　　要：将忽略本底引起的污染物扩散范围的计算偏差定义为本底效应。为研究忽略本底下污染物扩散计算结果的精确度及本底效应的变化规律,给今后污染物数值计算提供参考依据,更好服务于环境评估和决策制定,通过数学模型研究了不同污染物浓度在有无本底条件下的扩散规律。研究得到:本底效应随着源强浓度与本底浓度之比的增大而减小。当源强浓度远大于本底时,本底效应较小,忽略本底浓度计算得到的偏保守结果精度较高,可信度较强;当源强浓度与本底较接近时,本底效应突出,偏保守结果较实际情况相差甚远,可信度较差。The deviation of the pollutant diffusion of ignoring the background can be defined as the background effect.In order to study the accuracy of the result calculated without background and the discipline of background effect change,provide a reference for future numerical calculation of pollutants,and also better serve the environmental assessment and decision-making,in this paper,multiple sets of mathematical model test of different pollutant concentration diffusing in the presence or absence of natural background were taken.The results show that the background effect decreases with the increase of the ratio of source concentration to background concentration.When the source concentration is far greater than the background,the background effect is small.At this time,the conservative result calculated by ignoring the background concentration has a higher accuracy and a higher degree of credibility;otherwise the conservative result would be untrusted.According to the results of this study,it puts forward specific reference values for considering the background concentration in the future numerical calculation of pollutant diffusion.

关 键 词：污染物扩散 数值模拟 本底浓度 源强浓度 本底效应 

分 类 号：X828[环境科学与工程—环境工程]