基于鸿业SWMM模型的城市内涝防治优化设计探讨

Discussion on Optimal Design of Urban Waterlogging Control Based on Hongye SWMM Model

摘要:

城市内涝作为一种新型“城市病”，对城市的健康发展造成了多方面的挑战。光谷中心城作为武汉乃至全国的科技创新高地之一，为保证其内涝防治工作有的放矢，采用基于SWMM模型开发的“鸿业暴雨排水及低影响开发模拟系统”，对排水管网和水系建成后的光谷中心城，在50 a一遇的降雨条件下，进行径流在地表的淹没过程模拟，对内涝风险进行分析评估。结合分析评估结果，针对性地从排水管网、径流控制和调蓄、超标雨水通道三个方面构建排水、防涝、防洪三位一体综合体系，提出优化设计方案。优化后红Ⅰ风险区面积消减44.9%，橙Ⅱ风险区面积消减19.0%，黄Ⅲ风险区面积消减27.8%，蓝Ⅳ风险区面积消减11.3%，中心城内涝风险整体降低21.1%，区域内内涝风险明显改善。

Abstract:

As a new type of "urban disease", urban waterlogging poses many challenges to the healthy development of cities. Optical Valley Central City is one of the scientific and technological innovation highlands of Wuhan and even the whole country. In order to ensure its waterlogging prevention and control work with a definite objective in view, the “Hongye Rainstorm Drainage and Low-impact Development Simulation System” is developed by SWMM model to simulate the process of runoff surface waterlogging under the rainfall condition of once in 50 a for the Optical Valley Center City after the completion of drainage network and water system. The waterlogging risk is analyzed and assessed. Combined with the results of analysis and evaluation, a trinity integrated system of drainage, waterlogging prevention and flood control is built specially from three aspects of drainage network, runoff control and storage, and superstandard rainwater channels. An optimal design scheme is proposed. After optimized, the area of the Red I risk zone is reduced by 44.9%, the area of the Orange II risk zone is reduced by 19.0%, the area of the Yellow III risk zone is reduced by 27.8%, and the area of the Blue IV risk zone is reduced by 11.3%. The overall waterlogging risk in the central city is reduced by 21.1%. The waterlogging risk in the area is significantly improved.