Evaluation of Sponge City Construction Effect Based on SWMM Model
In order to quantitatively evaluate the effectiveness of sponge city construction in the Lihu area of Guangzhou,this study construct-ed a SWMM model at the scale of drainage zoning through background analysis and data collection.The simulation analysis of the sponge city construction effect in the Lihu area of Guangzhou was carried out from the aspects of annual runoff total control rate,pipe network overflow capacity,and waterlogging risk,in order to verify the disaster prevention and mitigation ability of the area after development and construc-tion according to the sponge city construction implementation plan.At the same time,the results of this study can provide theoretical refer-ence for sponge city construction in high-density areas in the south to alleviate urban waterlogging.The main conclusions drawn from simula-tion calculations of the Lihu area in Guangzhou are as follows:① After low impact development and construction,the annual runoff total con-trol rate in the Lihu area of Guangzhou has significantly increased.In 2022,the annual runoff total control rate in the area was 81.46%,which was 15.37%higher than that before the low impact development and construction in 2019;② The simulation analysis of the drainage network overflow capacity before and after the low impact development and construction in Lihu area of Guangzhou city shows that the area experienced overflow under different return periods of rainfall conditions before the low impact development and construction,and the over-flow ratio of the network increased with the increase of the design return period.After the low impact development and construction of the ar-ea,the overflow situation of the pipeline network was significantly reduced under different return periods of rainfall conditions;③ The simu-lation analysis of waterlogging risk after the low impact development and construction in Lihu District of Guangzhou City shows that the dis-trict is basically a risk-free area when the 24-hour rainfall with a 100 year return period(the accumulated rainfall is 322mm)occurs,and very few places are low-risk areas.The sponge city construction in Lihu District can effectively cope with the 100 year return period rain-storm.The construction of sponge cities in the Lihu area of Guangzhou can effectively reduce rainwater discharge and enhance the disaster prevention and mitigation capabilities of the area.
SWMM modelsponge cityeffect evaluationcapture ratio of total annual runoff volumeoverflow capacityLihu area
万方数据
维普
