为探究不同绿地调控方式对降雨径流的削减作用,以武汉市南湖汇水分区为研究对象,基于暴雨洪水管理模型(storm water management model,SWMM)模拟分析海绵绿地改造措施下的年径流总量控制率、峰值流量及峰现时间的变化规律,揭示蓝绿协同视角下城市汇水分区绿地削减雨水径流效应特征.结果显示:城市汇水分区尺度20%～30%的下凹式绿地改造,可实现年径流控制率65%的海绵城市建设目标;不同的海绵绿地改造措施中,复杂下凹绿地(具备蓄水层和下排管)和简单下凹绿地(无蓄水层和下排管)对于单场降雨事件的作用差异不明显,但长历时多场次降雨情况复杂下凹绿地的效果会更加显著.
Characteristics and scenario simulation of rainwater runoff effect reduction in urban catchment zoning green space from perspective of blue-green synergy:in case of South Lake of Wuhan
In recent years,there has been a shift in the approach to using grey infrastructure for rain-water and flood management,and the rainwater and flood regulation and storage function from the perspec-tive of blue-green synergy has begun to be emphasized.To explore the reduction effect of various green space regulation methods on rainfall runoff,taking the South Lake catchment zone of Wuhan City as the re-search object,this paper simulates the changes in the total annual runoff control rate,peak flow and peak time under the sponge green space renovation measures based on the SWMM(storm water management model),revealing the effect of green space on reducing rainwater runoff in the urban catchment zone from the perspective of blue-green synergy.The results show that:the transformation of concave green space with a scale of 20%-30%for urban catchment zones can achieve the sponge city construction goal of an an-nual runoff control rate of 65%.Among different sponge green space transformation measures,there is no significant difference in the effect of complex concave-down green space(with aquifer and lower pipe)and simple concave-down green space(without aquifer and lower pipe)on a single rainfall event.However,the performance of complex concave green space will be more significant for long-term and multi rainfall sit-uations.
blue and green spacerainwater runoffstorm water management modelcatchmenteco-logical effectscene simulation
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