HAN Jing-bo,YANG Mo-yuan,PAN Xing-yao,et al.Quantitative Evaluation of Multi-level Regulation Effect of Sponge City in Combined Drainage Zone[J].China Water & Wastewater,2020,36(19):95-101.
合流制排水分区海绵城市多层级调控效果定量评估
- Title:
- Quantitative Evaluation of Multi-level Regulation Effect of Sponge City in Combined Drainage Zone
- 关键词:
- 海绵城市; 多层级调控; 合流制溢流; 年径流总量控制率; InfoWorks ICM
- Keywords:
- sponge city; multi-level regulation; combined sewer overflow; volume capture ratio of annual runoff; InfoWorks ICM
- 摘要:
- 海绵城市建设逐渐强调系统治理的理念，通过多层级调控措施充分发挥海绵城市建设效果，但目前多层级调控措施缺乏细致的定量评估研究。为此，以北京城市副中心海绵城市试点区内的一个已建合流制排水分区为例，基于InfoWorks ICM软件构建海绵城市建设区的精细化模型并开展情景模拟分析，定量评估不同层级的海绵城市建设效果。结果表明：①与海绵城市建设前相比，源头调控、过程调控、末端调控方案的年径流总量控制率由47.9%分别提升至51.4%、75.7%、75.2%，源头-过程联合调控方案和源头-过程-末端联合调控方案分别达到77.0%和84.5%；②在合流制排水分区计算年径流总量控制率时，应考虑在下游再生水厂处的间接溢流过程，以准确评估海绵城市建设效果；③对于合流制排水分区，实施截污管过程调控工程后仍存在年均13次的合流制溢流事件，源头-过程-末端联合调控使得年均溢流频次和溢流总量分别降低61.5%和52.5%；④受再生水厂处理能力的制约，多层级调控技术方案对排水分区下游再生水厂溢流事件的影响十分有限，年均溢流频次和溢流总量仅降低6.2%和3.8%，有必要在排水分区尺度多层级海绵城市建设的基础上，采用再生水厂提标改造等一系列综合性手段，实现区域尺度的海绵城市建设目标。
- Abstract:
- Sponge city construction gradually emphasizes the concept of system governance, and its effect can be fully manifested through multi-level regulation measures. However, there is a lack of detailed quantitative evaluation research on multi-level regulation measures. A case study was carried out in a built-up combined drainage area in a sponge city pilot area of Beijing sub-center. A refined model of sponge city construction area based on InfoWorks ICM software was built, and the scenario simulation analysis was carried out. The effect of sponge city construction at different levels was quantitatively evaluated. Compared with the pre-sponge city, the volume capture ratio of annual runoff of source regulation, process control and terminal regulation schemes increased from 47.9% to 51.4%, 75.7% and 75.2% respectively, and those of the source-process and source-process-end combined control schemes reached 77.0% and 84.5%, respectively. When calculating volume capture ratio of annual runoff in the combined drainage zone, indirect overflow process of downstream reclaimed water plant should be considered to accurately evaluate the effect of sponge city construction. For the combined drainage zone, there were still 13 combined sewer overflow events per year after the implementation of the interception pipeline control project, and the source-process-end combined regulation could reduce the annual average overflow frequency and total overflow volume by 61.5% and 52.5%, respectively. Restricted by the treatment capacity of the reclaimed water plant, the impact of the multi-level regulation technical scheme on the overflow events of the downstream reclaimed water plant was very limited, and the annual average overflow frequency and total overflow volume only decreased by 6.2% and 3.8% respectively. Therefore, it was necessary to adopt a series of comprehensive means, such as construction of reclaimed water plant, to realize the construction target of sponge city at regional scale on the basis of multi-level sponge city construction of the drainage zone.
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