The aim of the present study was to investigate the impact of the mean flow velocity on the Floating Treatment Wetland (FTW) roots' network behaviour and associated opportunity for suspended solids entrapment. The objective was to identify the appropriateness of a FTW to reduce turbidity in a retention pond subject to specific flow regimes. A flume experiment with and without FTW was run under three mean flow velocities impacting roots' inclinations and roots' water column occupancy. For initial turbidity of 60–70 FNU, the results indicate that inclusion of a FTW would increase turbidity reduction by up to 37%, 34% and 45% under flow velocity of 0.023 m/s (V1), 0.097 m/s (V2) and 0.181 m/s (V3), respectively, compared to the Control (experiments without FTW). This suggests that even under high flow velocity, inducing the roots to flatten under the mat, the FTW provided an efficient additional particles removal process to settlement, i.e. entrapment of suspended solids into FTW roots' network. For V1, turbidity thresholds for good and very good water quality status (EU guidelines) were reached about 1:00 and 5:30 (h:mm) faster with the inclusion of a FTW. Providing that flow ratio through the FTW roots' network could be promoted in a real retention pond, such as in the present flume experiment, potential turbidity removal efficiency solely induced by a FTW covering 16% of a pond length and 70% of pond width could be extrapolated for various pond sizes. As an example, the inclusion of a 8 m long FTW in a 50 m long pond with inlet turbidity of 60–70 FNU, could improve turbidity removal efficiency by ~32% at low flow velocity (V1) and by ~10% at medium and high flow velocities (V2 and V3).

本研究的目的是调查平均流速对漂浮处理湿地（FTW）根的网络行为的影响以及相关的悬浮固体截留机会。目的是确定FTW是否适合在特定流域下降低滞留池中的浊度。在三个平均流速影响根系的倾斜度和根系的水柱占用率的情况下，进行了带或不带FTW的水槽实验。对于60–70 FNU的初始浊度，结果表明，在流速为0.023 m / s（V1），0.097 m / s（V2 ）和0.181 m / s（V3），与对照组相比（没有FTW的实验）。这表明即使在高流速下，FTW导致根部在垫子下方变平，从而为沉降提供了有效的附加颗粒去除过程，即将悬浮的固体截留在FTW根部的网络中。对于V1，加入FTW可以使达到良好和非常好的水质状态的浊度阈值（欧盟准则）更快地达到1:00和5:30（h：mm）。假设可以在真正的滞留池中提高通过FTW根系网络的流量比率，例如在当前的水槽实验中，仅由FTW覆盖池长的16％和池宽的70％的潜在浊度去除效率就可以根据各种池塘大小进行推断。例如，在一个50m长的池塘中包括一个8m长的FTW，进水浊度为60-70 FNU，