基于局部DEM重构的城市内涝模拟研究

Simulation Study of Urban Flooding Based on Locally Reconstructed DEM

为了提高城市内涝模拟精度,以福州市杨桥中路片区为例,利用InfoWorks ICM软件构建了基于局部DEM重构的精细化内涝耦合模型,并采用3场历史降雨对模型进行率定和验证,验证结果表明模型模拟精度较高。采用相同的模型结构,在进行网格化2D区间时分别使用重构DEM、原始DEM以及单一反距离权重插值DEM,对模型的模拟结果进行对比。结果表明:基于局部DEM重构的内涝模型相较于原始DEM模拟水深相对误差平均降低了25.83%,相较于单一反距离权重插值DEM,模拟水深与范围更符合实际情况。

In order to improve the accuracy of urban flooding simulation,a refined coupled model of flooding based on local reconstructed DEM was constructed by using InfoWorks ICM software for the Yangqiao Middle Road area of Fuzhou City as an example,and 3 historical rainfall events were used to rate and validate the model,and the validation results showed that the model simulation accuracy was high.Using the same model structure,the simulation results of the model were compared by using the reconstructed DEM,the original DEM and the sin⁃gle inverse distance weight interpolation DEM when gridded 2D intervals were performed.The results show that the relative error of simulated water depth based on the locally reconstructed DEM is reduced by 25.83%on average compared with the original DEM,and the simulated water depth and range are more consistent with the actual situation compared with the single inverse distance weight interpolation DEM,and the research results can provide a reference for urban flooding simulation.