洪水灾害是一种突发性自然灾害,它给人民生命、财产带来了巨大的损失。为了辅助洪水灾害评估,减少洪水灾害带来的损失,提出了一种基于LiDAR(Light Detection And Ranging)数据的城市建模与仿真方法。该方法首先基于LiDAR数据和航拍图像...洪水灾害是一种突发性自然灾害,它给人民生命、财产带来了巨大的损失。为了辅助洪水灾害评估,减少洪水灾害带来的损失,提出了一种基于LiDAR(Light Detection And Ranging)数据的城市建模与仿真方法。该方法首先基于LiDAR数据和航拍图像对城市房屋和道路进行重建,然后基于重建数据,对洪水灾害及发生洪水灾害时的人员疏散情况进行仿真,并以可视化形式对仿真场景进行显示。最后以美国路易斯安那州新奥尔良市的LiDAR点云数据和航拍图像为实验数据,验证了这种城市建模与仿真方法在辅助洪水灾害评估时的有效性。展开更多
The occurrence of storm surge disaster is often accompanied with floodplain, overflow, dike breach and other complex phenomena, while current studies on storm surge flooding are more concentrated on the 1D/2D numerica...The occurrence of storm surge disaster is often accompanied with floodplain, overflow, dike breach and other complex phenomena, while current studies on storm surge flooding are more concentrated on the 1D/2D numerical simulation of single disaster scenario(floodplain, overflow or dike breach), ignoring the composite effects of various phenomena. Therefore, considering the uncertainty in the disaster process of storm surge, scenario analysis was firstly proposed to identify the composite disaster scenario including multiple phenomena by analyzing key driving forces, building scenario matrix and deducing situation logic. Secondly, by combining the advantages of k-ω and k-ε models in the wall treatment, a shear stress transmission k-ω model coupled with VOF was proposed to simulate the 3D flood routing for storm surge disaster. Thirdly, risk degree was introduced to make the risk analysis of storm surge disaster. Finally, based on the scenario analysis, four scenarios with different storm surge intensity(100-year and 200-year frequency) were identified in Tianjin Binhai New Area. Then, 3D numerical simulation and risk map were made for the case.展开更多
文摘洪水灾害是一种突发性自然灾害,它给人民生命、财产带来了巨大的损失。为了辅助洪水灾害评估,减少洪水灾害带来的损失,提出了一种基于LiDAR(Light Detection And Ranging)数据的城市建模与仿真方法。该方法首先基于LiDAR数据和航拍图像对城市房屋和道路进行重建,然后基于重建数据,对洪水灾害及发生洪水灾害时的人员疏散情况进行仿真,并以可视化形式对仿真场景进行显示。最后以美国路易斯安那州新奥尔良市的LiDAR点云数据和航拍图像为实验数据,验证了这种城市建模与仿真方法在辅助洪水灾害评估时的有效性。
基金Supported by the National Basic Research Program of China("973" Program,No.2013CB035906)Natural Science Foundation of Tianjin(No.JCYBJC19500)the Foundation of Innovative Research Groups of National Natural Science Foundation of China(No.51321065)
文摘The occurrence of storm surge disaster is often accompanied with floodplain, overflow, dike breach and other complex phenomena, while current studies on storm surge flooding are more concentrated on the 1D/2D numerical simulation of single disaster scenario(floodplain, overflow or dike breach), ignoring the composite effects of various phenomena. Therefore, considering the uncertainty in the disaster process of storm surge, scenario analysis was firstly proposed to identify the composite disaster scenario including multiple phenomena by analyzing key driving forces, building scenario matrix and deducing situation logic. Secondly, by combining the advantages of k-ω and k-ε models in the wall treatment, a shear stress transmission k-ω model coupled with VOF was proposed to simulate the 3D flood routing for storm surge disaster. Thirdly, risk degree was introduced to make the risk analysis of storm surge disaster. Finally, based on the scenario analysis, four scenarios with different storm surge intensity(100-year and 200-year frequency) were identified in Tianjin Binhai New Area. Then, 3D numerical simulation and risk map were made for the case.
