College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China.
Tianjin Center, China Geological Survey, Tianjin 300170, China.
Sci Total Environ. 2022 Aug 25;836:155755. doi: 10.1016/j.scitotenv.2022.155755. Epub 2022 May 5.
With the rapid progress in urbanization, frequent urban waterlogging and non-point source pollution are threatening the living and health of human beings. Sponge city construction has become an effective means to curb urban waterlogging. Although related studies have explored the comprehensive benefits of sponge cities, few studies have been conducted on the effects of different geographical environments on runoff control and suspended solid (SS) removal. Based on 76 cities with sponge cities in China, this study used the meta-analysis method to evaluate the relationships of climate, terrain, underlying surface conditions, and construction area with the increase in the total annual runoff control rate and SS removal rate. The results reveal that the runoff control benefit can be significantly improved by sponge cities under the combined conditions of average annual precipitation of approximately 1000 mm, high fractional vegetation cover, sufficient soil fertility, a terrain slope i of ≤2%, and a permeability coefficient of strata of 100-200 m/d, especially in northern China, where the weight representing the quantity of comprehensive benefits was calculated to be 25.5%. In addition, the study results assist in reforming unfavorable geographical environments in the construction of sponge city, thus providing more effective solutions for tackling SS pollution. The most significant benefits of SS removal were obtained in north central China, where the weight was 21.4%. This study comprehensively investigated the effects of geographical environmental factors on the comprehensive benefits of sponge city reflected by the improvement in the total annual runoff control rate and the SS removal rate. The results will provide guidance for the planning and design of global sponge cities and effectively optimize the practice, scale, and location of existing construction based on specific geographical environments.
随着城市化进程的快速推进，频繁发生的城市内涝和非点源污染正威胁着人类的生活和健康。海绵城市建设已成为遏制城市内涝的有效手段。尽管相关研究已经探讨了海绵城市的综合效益，但很少有研究关注不同地理环境对径流控制和悬浮固体（SS）去除的影响。本研究基于中国 76 个海绵城市，采用元分析方法评估气候、地形、下垫面条件和建设面积与总年径流控制率和 SS 去除率增加的关系。结果表明，在年平均降水量约 1000mm、植被覆盖度高、土壤肥力充足、坡度 i≤2%、地层渗透系数为 100-200m/d 的综合条件下，海绵城市可显著提高径流控制效益，特别是在中国北方，综合效益权重计算为 25.5%。此外，研究结果有助于改造海绵城市建设中的不利地理环境，为解决 SS 污染提供更有效的解决方案。SS 去除的最大效益出现在中国中北部，权重为 21.4%。本研究全面调查了地理环境因素对总年径流控制率和 SS 去除率提高所反映的海绵城市综合效益的影响。研究结果将为全球海绵城市的规划和设计提供指导，并根据特定的地理环境有效优化现有建设的实践、规模和位置。
