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| DOI：10.13522/j.cnki.ggps.2025218 |
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| Simulation and evaluation of low-impact development stormwater control under varying rainfall scenarios |
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WEI Juncheng, GE Yang, WEI Shuai, KANG Zheng, FU Tiewen, LIU Zhiyong
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1. Center for Water Resources and Environment, School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China;
2. Zhongshan Water Supply Affairs Center, Zhongshan 528400, China; 3. Zhuhai Water Affairs Bureau, Zhuhai 519000, China
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| Abstract: |
| 【Objective】With rapid urbanization increasing stormwater runoff and flood risk, low impact development (LID) measures have become an effective approach for urban stormwater management. This paper investigates the impact of various rainfall scenarios on the stormwater control efficiency of LID facilities.【Method】The study was based on the storm water management model (SWMM) and the Chicago storm hyetograph. Taking the Dakeng River Basin in Guangzhou as the study area, we investigated and compared the efficiency of four types of LID facilities: sunken green spaces, rain gardens, green roofs, and permeable pavements, in controlling runoff for the same renovation area under six return periods: 1, 2, 5, 10, 20 and 50 years.【Result】①As the return period increases, the overall control efficiency of all LID types decreased, suggesting the limited buffering capacity of LID facilities against extreme rainfall events. ②The control efficiency of the LID types was ranked as follows: rain garden ≈ permeable pavement＞LID2＞LID1＞sunken green space＞green roof. Rain gardens and permeable pavements were most effective in reducing total runoff, while the combined schemes excelled in optimizing the temporal distribution of runoff. ③Earlier rainfall peaks amplified the rapid rise and slow recession of runoff, increasing the difficulty of peak flow control and reducing the overall stormwater control efficiency.【Conclusion】Both rainfall return period and peak characteristics significantly influenced the stormwater control efficiency of LID facilities. Among the 6 types of LID facilities we compared, rain gardens and permeable pavements were most effective in reducing total runoff, whereas the combined schemes were superior in optimizing temporal runoff distribution. These findings provide valuable guidance for the design and optimization of urban stormwater management systems. |
| Key words: SWMM model; low impact development; stormwater control efficiency; rainfall peak coefficient |
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