济南市山前平原区暴雨内涝模拟

应用InfoWorks ICM综合流域模拟软件,建立济南市山前平原区一维排水管网模型和二维地面淹没模型,对2015-08-03场次实测降雨和不同降雨情景下的研究区内节点溢流和地面淹没情况进行定量模拟,统计溢流检查井的分布和地面淹没范围,利用实测地面淹没过程线校验实测洪涝过程模拟结果,验证模型适用性,分析模型误差原因.结果表明:1)一维模拟站点附近节点最大溢流出现时间为21:50,二维模拟地面最大水深出现时间为20:05,二维模拟与实际出现时间20:03较为相符,二维模拟最大水深为0.078m,与实测值0.07m 也比较吻合;2)由于二维模拟结果准确性较高,以二维模拟结果为标准,确定2015-08-03场次降雨为5a一遇降雨标准.本研究对研究区历史暴雨洪水进行了评估,给出了多种降雨情景下的地面淹没过程,将为研究区防洪减灾工作及正在进行的“海绵城市”建设工作提供科技支撑. 

Simulating rainstorm waterlog in piedmont plains in Jinan City

Urban flooding,due to climate change and rapid urbanization, has become a great challenge for Jinan City. In the present study,Infoworks ICM model was used to simulate rainstorm waterlog in piedmont plains of Jinan. One-dimensional stormwater network model and two-dimensional waterlog model were developed to simulate flood inundation for observed and design rainfalls with different return periods. Distributions of inundation nodes were recorded. Simulation results were compared with actual inundation hydrograph, with the model error further analyzed. Occurrence times of maximum water depth at station mesh for one-and two-dimensional models were found to be 21:50 and 20:05,respectively, consistent with actual records. The two-dimensional modeling results showed that maximum water depth was 0.078 which agreed well with observed values. The two-dimensional model performed better in simulations. Rainfall event on2015-08-03 had a 5 year frequency according to two-dimensional model. One-dimensional model may underestimate inundation. An historical stormwater flood was simulated, design rainfalls with different periods were further simulated,the sources of model error was then analyzed. This work will provide some scientific basis for flood control and disaster reduction, and for the construction of "sponge city" in Jinan.