Hydrologic Impacts of Sewershed-Scale Green Infrastructure Retrofits: Outcomes of a Four-Year Paired Watershed Monitoring Study
Hydrologic Impacts of Sewershed-Scale Green Infrastructure Retrofits: Outcomes of a Four-Year Paired Watershed Monitoring Study
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DOI：
10.1016/j.jhydrol.2022.128014
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发表时间：
2022-06
影响因子：
6.4
通讯作者：
Kathryn M. Boening-Ulman;R. Winston;David M. Wituszynski;Joseph S. Smith;R. Andrew Tirpak;Jay F. Martin
中科院分区：
文献类型：
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作者：
Kathryn M. Boening-Ulman;R. Winston;David M. Wituszynski;Joseph S. Smith;R. Andrew Tirpak;Jay F. Martin
世界各地的城市都在实施绿色基础设施（GI）改造以管理雨水，但在量化这些努力在流域尺度上的水文影响方面进行了有限的研究。为了填补这一知识空白，本研究的目的是监测和评估的影响，GI雨水控制措施（SCM）的污水处理规模径流水文在多个污水处理区与不同的GI实施。应用配对分水岭方法，其中对照（即，2016年至2019年，在美国俄亥俄州的哥伦布对三个处理污水棚（208个生物滞留单元和8，400 m2的可渗透路面）进行了监测。进一步的基础设施改造，如内衬卫生下水道，以防止雨水渗透和流入，预计将通过将更多的雨水引入雨水管道来抵消GI改造所带来的水文改善。在安装GI改造后，在处理污水厂中观察到径流深度和峰值流速显著降低（分别为35-62%和40-58%），滞后峰值增加（6-64%）。与对照污水棚相比，处理污水棚的径流阈值略有增加（1-3 mm），GI后的径流系数较低。在基础设施发生额外变化后，观察到流量和流速增加，但水文指标与GI前水平没有显著差异（即，整个项目对径流水文没有净影响）。这些答复表明，污水处理规模的GI实施成功地缓解了高峰流量，但是，额外的基础设施改善项目似乎已经抵消了量的减少，路由额外的雨水到GI。结果证实了下水道规模的GI改造的影响，但是，研究调查GI改造的位置，气候变化的影响，GI的设计，施工和维护，以最大限度地提高分布式SCM在城市地区的利益优化应进一步探讨。
Cities across the world are implementing green infrastructure (GI) retrofits to manage stormwater, but limited research has been performed to quantify the hydrologic impact of these efforts at the watershed-scale. To fill this knowledge gap, this study aimed to monitor and evaluate the impact of GI stormwater control measures (SCMs) on sewershed-scale runoff hydrology across multiple treatment sewersheds with varying GI implementation. A paired watershed approach was applied in which a control (i.e., no GI), and three treatment sewersheds (208 bioretention cells and 8,400 m2of permeable pavement in total) were monitored from 2016 to 2019 in Columbus, Ohio, USA. Further infrastructure changes, such as lining sanitary sewer laterals to prevent infiltration and inflow of stormwater, were anticipated to counterbalance the hydrologic improvements provided by the GI retrofits by routing more stormwater to the storm sewers. Significant decreases in runoff depths and peak flow rates (35–62% and 40–58% respectively) and increases in lag-to-peak (6–64%) were observed in the treatment sewersheds following the installation of GI retrofits. Compared to the control sewershed, the treatment sewersheds had slight increases (1–3 mm) in runoff thresholds and lower runoff coefficients post-GI. Following additional infrastructure changes, increases in volume and rate of flows were observed, but hydrologic indicators did not significantly differ from pre-GI levels (i.e., no net impact of the overall project on runoff hydrology). These responses indicated that sewershed-scale GI implementation successfully mitigated peak flow rates; however, the additional infrastructure improvement projects appear to have neutralized volume reductions by routing additional stormwater to the GI. Results confirm the impacts of sewershed-scale GI retrofits; however, research investigating the optimization of GI retrofit location, climate change impacts, and GI design, construction, and maintenance to maximize benefits of distributed SCMs in urban areas should be further explored.