Urbanization is accelerating at a breakneck pace, and with it comes an increasing risk of urban flooding, particularly in densely populated areas. A recent study led by Lyu Jiajie from the School of Environment at the Southern University of Science and Technology addresses this pressing issue through innovative rainwater management strategies tailored for urban rail transit depots. The research, published in ‘Chengshi guidao jiaotong yanjiu’—translated as ‘Urban Traffic Research’—explores the integration of gray and green infrastructure to create a more resilient and efficient rainwater system for the Yuhuazhai Depot of Xi’an Metro Line 3.
The study employs advanced hydrological simulation software, SWMM (Storm Water Management Model), to evaluate various rainwater management schemes. By utilizing a multi-objective optimization method that combines the response surface method with a particle swarm optimization algorithm, the research team was able to fine-tune the configuration of green infrastructure elements, such as permeable pavements and retention ponds. This meticulous approach aims to control total runoff volume, peak flood levels, total suspended solids (TSS), and associated costs.
“Our goal was to not only meet regulatory standards but also to maximize economic benefits for urban infrastructure projects,” Lyu explains. The findings suggest that prioritizing a combined layout of permeable pavements and retention ponds is key to achieving these objectives. This approach not only adheres to the GB 51345—2018 Assessment Standard for Sponge City Construction Effect but also enhances the overall efficiency of the rainwater system.
The implications of this research extend beyond Xi’an Metro; they resonate throughout the construction sector, where effective rainwater management is becoming increasingly critical. As cities grow and climate change exacerbates weather extremes, the demand for sustainable infrastructure solutions will only intensify. By integrating gray-green systems, construction companies can improve project viability and reduce long-term maintenance costs, ultimately leading to a more sustainable urban environment.
This study serves as a beacon for future developments in urban infrastructure, illustrating how thoughtful design can mitigate environmental risks while providing economic advantages. As Lyu notes, “The integration of gray and green infrastructure is not just a technical solution; it’s a pathway to smarter cities.” The potential for this research to influence urban planning and construction practices is significant, paving the way for a new era of resilience in urban environments.
For further insights into this groundbreaking research, visit the School of Environment, Southern University of Science and Technology.
