Sponge Capacity Assessment and Optimal Design of Drainage System in Urban Built-up Areas
The concept of low impact development(LID)offers new solutions to urban water problems in China,such as flooding,non-point source pollution and water ecology damage caused by urbanization.Combined grey-green in-frastructure can reduce both runoff and pollution.However,there is a lack of quantitative basis for the sponge ca-pacity,the storage capacity of green infrastructure and the design of key parameters.This study employs SWMM model simulation,numerical calculation and on-site measurements to assess the background sponge capacity.By combining the comprehensive runoff coefficient method,the degree of water-sensitive areas are identified in the study areas.The proportion of land parcels are categorized as excellent,good,moderate,poor,and extremely poor in terms of sponge capacity is 8.6％,9.1％,24.6％,55.0％,and 2.7％,respectively.The majority of the drainage areas are graded as moderate and poor;Combined with field measurements and RECARGA model simulation,the sponge capacity of green infrastructure and the inflow parameters of gray facilities are clarified.The results indicate that green infrastructure shows a more pronounced response to rainfall intensity than changes of filler thickness.Sys-tematic scheme design is carried out from two aspects of optimization of the drainage pipe system and the gray-green combined drainage system.The study establishes a technical path for the technical path of gray-green combined drainage regulation,providing an effective basis for selecting key design parameters and formulating pipeline reno-vation schemes.
国家科技期刊平台
NSTL
万方数据
