模块化人工湿地水力学性能数值模拟与优化

针对模块化人工湿地系统构建过程中存在的关键性问题,借助数值模拟方法对不同湿地基质铺设顺序、基质厚度和导流板设置方式下湿地内部的水力学性能进行系统评价。结果表明,保持各基质层铺设厚度一致(200mm)的前提下,由上至下依次按照中、大、小的阻力系数顺序铺设基质时,湿地模块内的水力学性能最优,水力效率(λ)可达0.912,在此铺设顺序下,当上、中、下层基质的厚度比设置为1∶4∶1并在模块湿地底部中间位置处(600mm)设置与下层基质等高(100mm)的导流板,湿地内部水力效率最佳,λ达到0.965。

Numerical simulation and optimization of hydraulic performance of modular constructed wetland

To solve the problem met in the building of modular wetland,hydraulic properties of the wetland module with different substrate laying sequence,substrate thickness and setting mode of guide plate were systematically evaluated using numerical simulation method in this paper.It was determined that the optimum hydraulic performance was achieved when the substrates,with a equal depth(200 mm),were laid in a medium,large and small resistance order from top to bottom,corresponding to a hydraulic efficiency value(λ)of 0.912.By using the above optimal laying order and setting up the ratio of the upper,middle and lower substrate thickness to 1∶4∶1 and setting guide plates with a equal height of bottom substrate(100 mm)at the middle of the bottom of the module wetland(600 mm),the optimum hydraulic performance(λ=0.965)of the module could be achieved.