摘要
Due to the complexity of sustainable urban research,the environmental sustainability was assessed.Taking the sponge city as an example,the case study was conducted based on the integrated geographic information system(GIS)and emergy methods.The results demonstrate that the emergy of agricultural crops,major industrial products,comprehensive energy products,imports and exports,waste products and increased natural system emergy are the decisive factors for the sustainability assessment.Agricultural crops are the primary contributor,which accounts for 48.9%of the total emergy amount.Urban solid waste has a self-evident superiority in the waste products emergy proportion.Surface water and vegetal biomass emergy possess the pivotal consequences,far higher than soil organic matter.The sewage treatment stations(0.11%)play a small role in the sustainability assessment of the sponge city.The emergy sustainability index is 0.02181,which indicates poor environmental sustainability.According to the study results,increasing renewable energy input proportion and adopting the vegetal biomass of high unit emergy values(UEVs)can improve the sustainability level.
针对城市可持续研究的复杂性,对城市环境进行可持续性评估.以海绵城市为例,基于集成的GIS和能值方法进行了案例评估计算和分析.结果表明:农业作物、主要工业产品、综合能源产品、进出口、废旧产品和自然系统增加的能值是可持续评价的决定性因素;农业作物为主要贡献者,占总能值的48.9%;城市生活垃圾对最终的结果有着较大影响.地表水和植物生物量的能值影响远高于土壤有机质.污水处理站在海绵城市可持续评价中作用不大,可持续指数为0.02181,效果较差.根据研究结果,提高可再生能源投入和高能值转化率的生物量可以改善海绵城市的可持续发展水平.
基金
The Postgraduate Research and Practice Innovation Program of Jiangsu Province (No.KYCX18_0104).
