多孔纤维棉在绿色屋顶中的适配性试验研究

Experimental study on suitability of porous fiber cotton in green roofs

为了解多孔纤维棉在绿色屋顶排(蓄)水层的适配性,分别采用塑料凹凸排水板和多孔纤维棉作为绿色屋顶试验装置的排(蓄)水层,通过模拟降雨试验对外排径流量、水质和植物生长进行监测,探究多孔纤维棉与传统排(蓄)水层材料的差异。结果表明:相较于塑料凹凸排水板,2~8 cm厚的多孔纤维棉更适合作为绿色屋顶的排(蓄)水层,在干旱期可维持植物生长,在降雨期可提高雨水滞留效果和对悬浮物的削减效果,减少TP和COD_(Cr)的淋出,但会加剧TN的淋出。

In order to understand the adaptability of porous fiber cotton in the drainage(storage)layer of a green roof,plastic concave-convex drainage plates and porous fiber cotton were respectively used as drainage(storage)layers of green roof test device,and the differences between porous fiber cotton and traditional drainage(storage)layer materials were explored through monitoring runoff,water quality,and plant growth in rainfall simulation test.The results show that,compared with plastic concave-convex drainage plate,porous fiber cotton with a thickness of 2 to 8 cm is more suitable for the drainage(storage)layer of green roof,which can sustain plant growth during dry periods,improve stormwater retention effect and suspended solid reduction effect during rainfall periods,and reduce the leaching of TP and COD_(Cr),but it will aggravate the leaching of TN.