多介质潜流人工湿地的水动力过程模拟  

Mathematical Modeling of Hydrodynamics in Heterogeneous Subsurface Flow Constructed Wetland

作　　者：张涛[1] 宋新山[1] 卢守波[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《环境科学与技术》2011年第4期27-30,43,共5页Environmental Science & Technology

基　　金：上海市自然科学基金(No.10ZR1400300);国家自然科学基金创新群体基金(No.50721006);国家重点基础研究发展计划973计划专题(2006CB403402-3)

摘　　要：水动力过程是湿地净化功能发挥的重要机制之一。根据脉冲示踪试验,获得潜流人工湿地的水力停留时间分布曲线。针对其"多峰"现象,利用数学软件MATLAB7.0分别将对数正态分布、对流扩散模型以及考虑延迟的连续完全混合反应器模型对脉冲示踪试验数据进行叠加模拟,同时利用多流弥散模型拟合分析,结果表明:叠加模型和多流弥散模型均能较好的模拟示踪剂的迁移过程,其中对数正态分布叠加拟合模型效果最好,多流弥散模型的模拟结果则更反映了湿地分层结构的实际情况。Hydrodynamics of the constructed wetlands is an important mechanism affecting its treatment performance.Instantaneously injected sodium chloride tracers were used to obtain residence time distributions in 4 parallel inhomogeneous gravel cells of the subsurface flow constructed wetland.Considering the presence of multiple peaks,the combined models including logarithm normal distribution,dispersion and plug flow model（DPFM） and the completely stirred tank reactor model（CSTRM） and multiflow dispersion model（MFDM） were used to fit the experimental tracer breakthrough curve.Results showed that the combined models specifically logarithm normal distribution and MFDM could fit the transportation of tracer well.The result of modeling using the MFDM was a clear expression of layered structure of wetland cells resulting in distinctly different values of flow velocity and dispersion for each flow component.

关 键 词：潜流人工湿地 示踪试验 水力停留时间分布 叠加模拟 多流弥散模型 

分 类 号：X52[环境科学与工程—环境工程]