Wei Haoyu, Lundy Lian, Muthanna Tone Merete, Viklander Maria
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden.
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden.
Sci Total Environ. 2024 Oct 20;948:174749. doi: 10.1016/j.scitotenv.2024.174749. Epub 2024 Jul 14.
Gully pots (GPs) are an integral urban drainage component, transferring surface runoff into piped systems and reducing sediment and contaminant load on downstream sewers and receiving waters. Sediment build-up in GPs impairs their hydraulic performance, necessitating maintenance for hydraulic function recovery. The variations in sediment accumulation rates between GPs suggested by earlier studies challenge the effectiveness of adopting a generalised maintenance frequency. This study addresses the knowledge gap regarding how various factors influence sediment contamination in GPs. The impacts of seasonal activities and traffic conditions on the contamination of sediments in 27 GPs in areas with varying traffic intensities and street features (roundabouts, intersections, and straight roads) were examined. Over one year, GPs were emptied twice, with sediments collected for winter-spring and summer-autumn accumulation periods. These sediments were analysed for 84 substances, including metal(loid)s, hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), alkylphenols, phthalates, per- and polyfluoroalkyl substances and organotins. Significant temporal changes were identified in key parameters such as electrical conductivity, total organic carbons, tungsten (W), heavy-molecular-weight PAHs (PAH-H) and diisodecyl phthalate (DIDP) in GP sediments, influenced by winter road safety measures and autumn leaf abscissions. Significantly higher concentrations of 4-tert-octylphenol, DIDP, diisononyl phthalate, antimony and W were identified in GP sediments from roundabouts compared to those at the other two street features, exclusively during the winter-spring period. This is attributed to the synergistic effect of winter road safety measures and stop-and-go traffic patterns at roundabouts. No consistent spatial and temporal patterns were identified for substance concentration and mass accumulation rates. Results underscore the potential to develop a prioritisation-based maintenance strategy as an opportunity to enhance the efficiency of GP maintenance operations, ensuring better resource allocation and reduced environmental impact.
雨水口是城市排水系统不可或缺的组成部分，它将地表径流导入管道系统，减少下游下水道和受纳水体中的沉积物及污染物负荷。雨水口中沉积物的堆积会损害其水力性能，因此需要进行维护以恢复水力功能。早期研究表明，不同雨水口的沉积物积累速率存在差异，这对采用统一维护频率的有效性提出了挑战。本研究旨在填补关于各种因素如何影响雨水口沉积物污染这一知识空白。研究考察了不同交通强度和街道特征（环形交叉路口、十字路口和直道）区域内27个雨水口的季节性活动和交通状况对沉积物污染的影响。在一年时间里，雨水口被清空两次，分别收集冬春和夏秋两个积累期的沉积物。对这些沉积物进行了84种物质的分析，包括金属（类金属）、碳氢化合物、多环芳烃（PAHs）、烷基酚、邻苯二甲酸盐、全氟和多氟烷基物质以及有机锡。受冬季道路安全措施和秋季落叶的影响，雨水口沉积物中的关键参数如电导率、总有机碳、钨（W）、重分子量多环芳烃（PAH-H）和邻苯二甲酸二异癸酯（DIDP）出现了显著的时间变化。与其他两种街道特征处的雨水口相比，环形交叉路口的雨水口沉积物中4-叔辛基酚、DIDP、邻苯二甲酸二异壬酯、锑和W的浓度在冬春季节显著更高。这归因于冬季道路安全措施和环形交叉路口的启停交通模式的协同作用。未发现物质浓度和质量积累速率存在一致的时空模式。研究结果强调了制定基于优先级的维护策略的潜力，以此作为提高雨水口维护作业效率、确保更好资源分配和减少环境影响的契机。
