城市下凹式立交桥因其桥下路面常低于周边区域地形, 极易形成城市区域的/ 人为滞水点0, 在遭遇降雨时频 繁发生内涝积水灾害, 对城市交通、行人和车辆的安全构成了严重的危害。因此, 有效模拟城市立交桥区域的暴雨 洪水淹没程度, 对城市防洪减灾和交通应急管理具有重要的现实意义, 同时可以为解决城市内涝问题提供重要的科 技支撑。以济南市历下区立交桥为例, 采用 Mike U rban 模型和 Mike21 FM 模型, 依据研究区域数字高程数据, 2007 年 7 月 18 日黄台桥雨量站实测 3 h 降雨数据以及不同重现期的设计降雨过程, 对立交桥区域的暴雨积水程度 进行模拟计算与分析。研究结果表明, 2007 年/ 7 # 180暴雨发生时, 济南市历下区立交桥桥下最低洼区域积水深度 可达近 11 95 m 左右, 其积水深度高于济南市 100 年一遇暴雨的积水深度。

The urban co ncave o verpass bridges can easily become " art ificial waterlog g ing zone" since the area beneath t he bridg e is usually lower than the surr ounding ar eas, which leads to frequent w aterlog g ing disasters, endang ering the safet y o f urban tr af2 fic, pedestrians, and vehicles. T her efor e, effective simulatio n o f r ainst orm waterlo gg ing pr ocesses in ur ban over pass bridg e ar ea will hav e important practical sig nificance fo r ur ban f loo d co nt ro l, disaster r eduction, and t raffic emer gency manag ement. It can pr ov ide impo rtant t echnical suppo rt for solv ing the ur ban w aterlog g ing pr oblems. I n this study, both M ike Urban and M ike21 FM mo dels w ere used to simulate the waterlo gg ing pro cesses o f the 3 h r ainstorm o bserv ed in July 18, 2007 at Huang tai Bridg e rain g aug e st ation and the design precipitatio n w ith different return periods at t he Lix ia ov erpass bridg e ar ea in Jicnan cit y. T he results of t his study showed that the depth of waterlo gg ing in the lowest area under the Lix ia over pass bridge co uld r each abo ut 11 95 m during the 2007. 07. 18 r ainsto rm ev ent, which was hig her than that in a 1002year rainstorm in Jicnan cit y.

济南市海绵城市水循环演变与水文过程模拟项目( 230200064)