摘要
根据示踪试验的数据,由考虑扩散过程的推流模型计算得到的平均水力停留时间τ和水力停留时间分布的标准方差σθ2的理论值;利用数学软件MATLAB7.1模拟潜流人工湿地中的示踪剂浓度——时间响应曲线获得水力停留时间分布(RTD)函数,根据MATLAB软件中不同函数拟合得到的τ值与理论值间的比较,发现对数正态概率密度函数可以较好地拟合实际得到的示踪试验浓度——时间曲线,本研究的潜流人工湿地中水流状况为有扩散的推流模式.
According to the data from tracer test done in a pilot scale subsurface constructed wetland, the average hydraulic residence time （r） and the standard variance of the r distribution （（σθ^2）） are calculated on formulas given by the plug-flow based dispersion model. The experimental hydraulic residence time distribution （RTD） curve is modeled by software MATLAB based on the data from tracer test. Comparison between the r given by the plug-flow based dispersion model and modeling by functions in the software MATLAB demonstrates that log-normal probability density function can be satisfactorily used to model the RTD curve. It is concluded that the investigated water flow mode in subsurface constructed wetland is plug-flow based dispersion model.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第5期145-148,共4页
Journal of Southwest University(Natural Science Edition)
基金
国家科技攻关资助项目(863项目,2008AA06Z312)
国家自然科学基金资助项目(20477033)
教育部留学回国人员科研启动基金资助项目(教外司留No2004-527)
重庆市自然科学基金重点资助项目(CSTC2004BA7019)
关键词
潜流人工湿地
MATLAB软件
水力停留时间分布函数
示踪试验
模型
subsurface flow constructed wetland
software MATLAB
hydraulic residence time distribu- tion curve
tracer test
model
