title: [Correlation of substrate structure and hydraulic characteristics in subsurface flow constructed wetlands].
abstract: The correlation of substrate structure and hydraulic characteristics was studied by numerical simulation combined with experimental method. The numerical simulation results showed that the permeability coefficient of matrix had a great influence on hydraulic efficiency in subsurface flow constructed wetlands. The filler with a high permeability coefficient had a worse flow field distribution in the constructed wetland with single layer structure. The layered substrate structure with the filler permeability coefficient increased from surface to bottom could avoid the short-circuited flow and dead-zones, and thus, increased the hydraulic efficiency. Two parallel pilot-scale constructed wetlands were built according to the numerical simulation results, and tracer experiments were conducted to validate the simulation results. The tracer experiment result showed that hydraulic characteristics in the layered constructed wetland were obviously better than that in the single layer system, and the substrate effective utilization rates were 0.87 and 0.49, respectively. It was appeared that numerical simulation would be favorable for substrate structure optimization in subsurface flow constructed wetlands.
authors.forename: Shao-Yuan
authors.initials: SY
authors.lastname: Bai
authors.forename: Zhi-Xin
authors.initials: ZX
authors.lastname: Song
authors.forename: Yan-Li
authors.initials: YL
authors.lastname: Ding
authors.forename: Shao-Hong
authors.initials: SH
authors.lastname: You
authors.forename: Shan
authors.initials: S
authors.lastname: He
mesh_terms: D008962:Models, Theoretical; D014865:Waste Disposal, Fluid / Q000379:methods*; D053833:Wetlands