潜流人工湿地水力学特性及工程设计

以净化低污染水体的潜流人工湿地水力学特性工程设计为重点，系统开展了室内外实验研究，并利用Peelet数分析了水平潜流人工湿地碎石床渗流返混程度。结果表明，潜流人工湿地集水花管孔口出流计算、基质填料内渗流计算、碎石床平均水力停留时间计算可分别借鉴薄壁孔口恒定淹没出流、线性或非线性渗流、活塞流理论；但受工程实际条件及运行淤堵等影响，工程实测结果均小于理论计算值。基于室内外实验成果，提出一套包括集配水系统水力计算、填料内渗流计算、平均水力停留时间计算在内的潜流人工湿地水力学特性计算方法和参数选择，可为人工湿地技术的工程设计提供借鉴。

Hydraulic characteristics and engineering design of subsurface flow constructed wetland

This study focused on the hydraulic characteristics and engineering design of subsurface flow constructed wetlands （SFWs） which are used for slightly polluted water purification. A series of researches were carried out systematically by laboratory and field tests, and the backmixing behavior in SFWs was analyzed by Peclet Number. The results show that the hydraulic characteristics of SFWs is in line with the basic theory of hy- draulics. The flow capacity of perforated pipe, the flow in wetland medium and average hydraulic retention time （HRT） in SFWs can be calculated by submerged orifice flow, linear or nonlinear seepage flow and piston flow separately. But with the impact of actual conditions and clogging, the measured values of a SFW were less than the theoretical values. Based on the laboratory and field results, the hydraulic design for SFW engineering was proposed, including the hydraulic calculation of water distribution system, seepage calculation in wet｜and medi- um, and the average HRT calculation, which is greatly beneficial to the design of SFW engineering.