随着经济社会快速发展和人口增加,城市附近蓄滞洪区内轨道交通项目建设速度明显加快,国内外就其项目建设对蓄滞洪区运用产生的影响研究较少。以武汉市轨道交通21号线工程为例,采用动边界模拟技术,建立蓄滞洪区二维水流数学模型,在此基础上就轨道交通建设项目对蓄滞洪区运用的影响进行分析研究。研究成果表明:武湖蓄滞洪区内轨道交通工程桥墩、车站等占用有效蓄滞容积相对较小;工程建设对蓄滞洪区分洪流量、历时、水位及流场过程的影响较小,对蓄滞洪区退洪流量、历时、水位及流速过程等影响不大,不会对蓄滞洪区运用带来明显不利影响,其研究方法及成果可供工程规划设计单位及防洪管理部门参考。

With rapid economic and social development and population growth, rail transit project construction increases obviously at flood detention basin near big city, but few reasearchers turn their eyes to the influence of rail transit on usage of flood detention basin. In view of this, we take rail transit No. 21 in Wuhan as an example. We apply dynamic boundary simulation technology and establish a two-dimensional water flow mathematical model for the flood detention basin to analyze the influence on the basin. Results show that effective flood detention volume occupied by bridge pier or railway station is relatively small in Wuhu flood detention basin. Furthermore, project construction has little influence on flood diversion discharge, duration, water level and flow field. It is the same for flood fall discharge,so project construction doesn’t have obvious adverse impact on the usage of flood detention basin. Finally, the research method and results can be taken as reference for design companies and autorities of flood prevention.