基于UAV精细化地表数据的城市洪涝模拟与分析——以济南市海绵城市示范区为例

近年来,气候变化与快速城市化使城市洪涝风险显著增大,给城市可持续健康发展造成重大威胁,精细化城市洪涝模拟是有效开展城市洪涝风险管理的重要手段,因此,雨洪模拟结果可靠性与精细程度至关重要.本研究以济南市海绵城市示范区为例,针对研究区特殊地形地貌特征,利用无人机(UAV)倾斜摄影技术获取精细化地表信息,基于此建立水文水动力...

Urban flood simulation and analysis using UAV-based refined surface data. Case study for sponge city pilot area of Jinan City

Climate change and rapid urbanization in recent years have resulted in a significant increase in urban flood risk, posing a considerable threat to sustainable and healthy development of the cities. Refined modelling of urban flood and waterlogging is often crucial to efficient flood management and requires better reliability and fineness of the flood model outputs. The sponge city pilot area of Jinan City was selected as a study case, where the special terrain and landform is conducive to urban flooding. Data of the refined urban land surface were collected using UAV-based oblique photography; and using these data, we have developed a hydro-hydrodynamic coupling model for interaction of various processes and applied it to analysis of the effect of terrain resolution on flood modeling. The results show that fine data resolution of the urban terrains is vital to accurate flood modeling, and using Digital Surface Model (DSM) or neglecting the walls in modeling will lead to overestimation or underestimation of the flood, which is really adverse. This study provides reliable, fine flood data to refined urban flood risk management in Jinan City.