潜流式人工湿地的数值模拟与参数率定

摘要：本文以沈阳辉山明渠河口潜流式湿地为例，探讨了利用数值模拟预测湿地运行效果以及参数率定的方法。采用多孔介质的水流与溶质运移耦合模型，通过对湿地模型的概化与处理，利用FEFLOW软件针对潜流基质层水流和溶质扩散进行了数值模拟，通过敏感度分析确定基质层的孔隙度、渗透系数、弥散系数和吸附降解系数为影响污水处理效果的敏感参数，并通过参数率定对所建立的湿地模型进行了模拟预测，结果证明所构建的湿地模型的预测值与观测值拟合程度较好，从而为潜流式人工湿地设计中运行效果预测及参数设定提供了一种新的有效方法。

Numerical Simulation and Parameter Calibration for SFS

Abstract: Taking SFS of open channel in Hui Shan ,Shenyang as an example, the paper discusses the effect of the wetland operation and the method of parameter calibration by numerical simulation and prediction. This thesis utilizes the coupling model for flow and solute transport of porous medium and based on the conceptualization and process of wetland model, uses FEFLOW software to simulate flow and solute diffusion in matrix layer of SFS. The sensitivity analysis shows that porosity, hydraulic conductivity, dispersivity and first-order-decay rate are the sensitive parameters of the treatment effect. At the meantime, the paper utilized parameter calibration to simulate and predict the wetland model, the result showed that the model forecast is in a good coincidence with the observations. It can provide a new and effective method for the effect of operation and parameter setting in the design of SFS.