ABSTRACT

Runoff entering urban drainage systems contains suspended solids, which carry pollutants and may cause blockages in downstream parts of the system (for example infiltration facilities). Suspended solids inflow should, therefore, preferably be controlled by solids removal at gully pots. This paper presents the results of lab experiments on the solids accumulation in gully pots in a scale 1:1 setup. The accumulation process is initially dominated by settling in the gully pot. When a substantial sediment bed is created, the bed starts to interact with the flow, the removal efficiency of solids decreases, and the bed eventually reaches an equilibrium level. The effects of the discharge, sediment size, and geometry on these processes are assessed. The accumulation rate and equilibrium bed level are strongly affected by the flow pattern which is influenced by the combination of the position the jets impinge on the water and the gully pot’s outlet position.

摘要

进入城市排水系统的径流包含悬浮固体，这些固体会携带污染物，并可能导致系统下游部分（例如渗透设施）阻塞。因此，悬浮固体的流入最好应通过在沟渠中除去固体来控制。本文介绍了以1：1比例设置的实验室实验结果，这些实验结果显示了在沟壑花盆中的固体沉积物。最初的积累过程主要是通过安置在沟渠中。当形成大量的沉积床时，该床开始与水流相互作用，固体的去除效率降低，并且该床最终达到平衡水平。评估了排放，沉积物大小和几何形状对这些过程的影响。