不同布水方式下水平潜流人工湿地水动力学机制研究

通过6种布水方式（一般推流、多向入流、部分回流、波流、对角流、多点进水）下水平潜流人工湿地的脉冲示踪剂实验研究，获得其水力停留时间概率分布密度曲线。用4种不同概率分布函数（正态分布、对数正态分布、卡方分布、瑞利分布）对其水力停留时间的概率分布密度进行拟合分析，结果表明：对数正态分布的拟合效果更好。将对流扩散模型和连续反应器模型分别用于6种布水方式下的示踪剂迁移过程模拟，结果表明：连续反应器模型比较适合模拟部分回流式布水方式，对流扩散模型能够较好模拟其他5种布水方式。考虑多向入流和多点进水的示踪剂浓度叠加作用，进一步利用基于对流扩散机制的叠加模型进行示踪剂迁移过程模拟，结果表明：基于对流扩散机制的叠加模型能够较好模拟多向入流、多点进水类型的水平潜流人工湿地。

Hydrodynamic mechanism of horizontal subsurface flow constructed wetlands for differential inflow configuration

According to tracer tests, six kinds of horizontal subsurface flow constructed wetlands with different inflow configuration(i.e. common push flow, more direction inflow, part circumfluence, wave flow, diagonal flow, more point inflow) have different hydraulic residence time distribution density curve. Among four kinds of probability distribution functions(i.e. normal distribution, logarithm normal distribution, chi-square distribution, rayleigh distribution), the logarithm normal distribution function has better fit results. According to simulation results on tracer concentration of six kinds of horizontal subsurface flow constructed wetlands with different inflow configuration, the completely stirred tank reactor model(CSTRM) is better to fit part circumfluence inflow configuration, the dispersion and plug flow model(DPFM) is better to fit other five kinds of inflow configuration. Considering tracer concentration folding of more direction inflow and more point inflow constructed wetlands, this study discovers that the dual DPFM is better to simulate their tracer movement in horizontal subsurface flow constructed wetlands.