灰绿耦合基础设施空间布局优化对城市内涝缓解效果的研究

Study on Effect of Optimizing Spatial Layout of Gray-Green Coupled Infrastructure on Alleviating Urban Waterlogging

摘要:

在城市化与气候变化背景下，传统灰色基础设施难以应对日益严峻的城市内涝问题。现有研究缺乏针对不同内涝风险区的灰绿设施协同布局优化与耦合效应量化分析。以郑州市七里河片区为例，构建SWMM-GRMS（storm water management model-gravitational RMS acceleration）耦合模型，模拟50年一遇暴雨下不同灰绿设施布局的水文响应，并基于上、中、下游内涝点提出差异化治理策略。结果表明：灰色设施具有较强峰控能力，其中H2点削减率80%，但响应陡峭；绿色设施可延峰平程，削减率为15%~25%，但容量有限；灰绿耦合则显著提升峰值削减率，H1、H2、H3分别为83%、85%、79%，过程线更平缓稳定。研究验证了基于空间分布差异的灰绿耦合布局对提升城市内涝综合防治能力的有效性。

Abstract:

In the context of urbanization and climate change, the traditional grey infrastructure is hard to cope with increasingly severe urban waterlogging problem. Existing research lacks the quantitative analysis on the collaborative layout optimization and coupling effects of gray-green facilities in different waterlogging risk areas. Taking Qilihe Area in Zhengzhou as an example, a coupled model of SWMM-GRMS (storm water management model - gravitational RMS acceleration) is established to simulate the hydrological response of various grey-green infrastructure layouts under the once-in-50-years torrential rain. And the differentiated management strategies are proposed on the basis of the waterlogging points in the upstream, midstream and downstream areas. The results demonstrate that the grey facilities have the stronger peak flow control capacity, in which the reduction rate of H2 point is 80%, but the response is steep. The green facilities can delay the peak and flatten the level. The reduction rates are 15%~25%, but its capacity is limited. In contrast, the grey-green coupled approach significantly enhances the peak reduction rates to 83%, 85% and 79% at H1, H2 and H3, respectively, and the level line is more gradual and stable, which verifies that the effectiveness of the gray-green coupling layout based on spatial distribution differences in enhancing the comprehensive prevention and control capacity of urban waterlogging.