Development history of sponge cities and the state of research on runoff pollution control
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摘要: 以国内外海绵城市建设理论体系的发展历程为出发点,探究各国海绵城市建设异同与发展经验,继而以海绵城市建设最为典型的单项措施——雨水花园为例,从其结构组成、水力特性以及植物配置等方面分析其对径流污染的控制效应,以期为我国海绵城市建设提供理论借鉴.最后提出了海绵城市建设与运行存在的堵塞和蚊虫孳生等潜在问题与风险,并对我国海绵城市建设提出建议和展望:借鉴国外海绵城市建设理论体系发展历程的同时需要实现海绵城市建设真正意义上的"中国化";因地制宜,注重区域差异性;加强现场试验,进一步探究海绵城市对径流污染的控制机制;与此同时,堵塞和蚊虫孳生作为海绵城市建设与运行存在的潜在问题与风险也应予以重视.Abstract: Based on the development history of sponge city construction system in China and abroad, this paper explores the similarities and differences and development experiences of sponge cities in various countries. Taking the rain garden as the research object, this paper analyzes the effect of its structural composition, hydraulic characteristics, and plant configuration on runoff pollution; these can be used to provide a theoretical reference for the construction of sponge cities in China. Finally, potential problems and risks in the construction of the sponge city were presented, and suggestions and prospects for the construction of a sponge city such as mosquito breeding and plugging are presented, and suggestions and prospects for the construction of a sponge city in China are proposed. It is important to learn from the development history of foreign stormwater management systems and realize the "Sinification" of stormwater management in practice by:adapting to local conditions, focusing on regional differences, strengthening field trials, and exploring the control mechanism of sponge cities on runoff pollution. Meanwhile, the potential risks and problems related to plugging and mosquito breeding in sponge city construction should also be taken seriously.
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Key words:
- sponge city /
- development history /
- rain garden /
- runoff pollution control /
- problems and risks
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表 1 部分海绵城市试点建设技术导则差异统计
Tab. 1 Variance statistics of construction guidelines for each sponge city
城市 多年均降雨量 径流总量控制率/mm 径流污染控制(以TSS去除率)/% 推荐植物(水生植物为例)/% 径流峰值控制(以雨水排水系统设计重现期表示[24]) 白城[25] 399.8 80~85 50~70 石菖蒲、千屈菜等, 芦苇、鸢尾和千屈菜等 一般地区取2~3年, 重要地区取3~5年, 地下通道和下沉式广场等取10~20年 西宁[26] 380.0 85~90 68~74(海湖片区) 水葱、旱伞草和千屈菜等 一般地区取2~3年, 重要地区取3~5年, 地下通道和下沉式广场等取10~20年 鹤壁[27] 664.9 70~85 40~60 未推荐 一般地区取2~3年, 重要地区取3~5年, 地下通道和下沉式广场等取10~20年 上海[28] 1 123.7 75~85 75~80 美人蕉、水葱和灯芯草等 一般地区取3~5年, 重要地区取5~10年, 地下通道和下沉式广场等取30~50年 重庆[29] 1 133.0 75~85 ≥50 千屈菜、芦竹和美人蕉等 一般地区取2~5年, 重要地区取5~10年, 地下通道和下沉式广场等取20~30年 三亚[30] 1 263.0 60~85 ≥ 45 风车草、富贵竹、菖蒲和水生美人蕉等 一般地区取2~3年, 重要地区取3~5年, 地下通道和下沉式广场等取10~20年 名称 厚度/mm 功能说明 蓄水层 200~300 蓄水层厚度即为溢流井超高, 为径流雨水提供暂时的储存空间, 使部分沉淀物在此层沉淀[35] 植物层 视植物种类而定 植物通过吸收作用去除部分污染物, 发达的根系可以增强土壤渗透能力以及污染物的去除效果[36] 树皮覆盖层 50~100 保持土壤的湿度, 避免表层土壤板结而造成渗透性能降低, 但是可能会因腐败对造成进行二次污染, 应该及时清理[37] 换土层 250~1 200 维持植物生长; 功能同滤料层, 过滤径流雨水, 去除污染物, 多选用渗透性较强的天然或人工材料 透水土工布或砂层 100(砂层) 主要是为了防止土壤层小颗粒, 冲刷到砾石层造成排水不畅[35] 砾石层 250~300 由粒径为12~35 mm的砾石组成, 承受上部荷载, 使得整个系统具有结构稳定性 表 3 雨水花园对径流污染物中N、P的去除状况
Tab. 3 Typical rain garden performance on the removal of N and P in stormwater runoff
位置 填料组成 去除率/% 文献来源 TN TP Chapel Hill, NC 砂 40 65 Hunt et al[47] Charlotte, NC 砂壤土, 6%细沙 30 31 Hunt et al[48] Rocky Mount, NC 98%砂, 2%覆盖物 80 72 Brown et al[49] Silver Spring, MD 砂质粘壤土, 54%砂, 46%细沙, 含有机质 97 100 Li and Davis[50] Graham, NC 80%覆盖物, 15%砂, 5%有机质 54 63 Passport and Hunt[51] Rocky Mount, NC 砂质粘壤土, 96%砂, 4%覆盖物 58 -10 Brown et al[52] Lenexa, KS 木屑和砂混合种植土, 含20%有机质 56 — Chen[53] Taiyuan, Shanxi 30%壤土, 40%砂, 15%珍珠岩, 15%蛭石 82 91 Gao et al[54] Wuxi, Jiangsu 80%沸石, 20%碎木屑 90 70 Wang et al[55] Beijing 草炭土做覆盖层, 黏土、粗沙等为填料 62 83 Guo et al[56] -
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