Simulating Emergency Evacuation Under Rainstorm And Flood Scenario

In the process of rapid urbanization,the area of urban construction land is rapidly expanding,and the large-scale urban underlying surface gradually becomes a hard cement surface,which makes the urban impervious surface rapidly increase,and the risk of urban flood disasters has become increasingly prominent.When flood disasters come,reducing people's lives and property losses is an important responsibility of the emergency disaster reduction departments of governments at all levels.How to timely and quickly evacuate and safely reach disaster avoidance points is also a key issue that every disaster-related person must think about.In response to this demand,the current government disaster reduction departments mainly establish emergency plans and implement emergency evacuation drills to improve the familiarity of the people in disaster-prone areas with the evacuation process and exercise the emergency command capabilities of disaster relief personnel.However,the traditional emergency plan drill has a single form,and residents are not motivated to participate and tend to become a formality.With the gradual maturity of the electronic sand table deduction simulation system,the construction of the virtual geographic environment of the storm flood disaster process based on the geographic information system and the deduction of emergency plans in the virtual scene have been gradually promoted and applied.However,the current emergency plan deduction software has insufficient simulation of the dynamics of flood inundation and disaster evacuated disaster scenes and the coordination of related subjects,and lacks a dynamic coordination mechanism between disaster scenes—emergency resources—evacuators—rescuers,which makes the plan virtual drills.The essence is still the emergency dispatch communication,which does not reflect the optimization of operations under various constraints in disaster scenarios.In response to the above problems,this paper uses a distributed hydrological model to input the rainfall scenario that triggers the start of the plan.Based on GPU-CA parallel computing,the rapid dynamic simulation of the storm flood inundation scenario is realized,and the road network connectivity is analyzed in real time;the existing one is improved.The multi-agent evacuation model enables the disaster survivor's agent to dynamically plan its own evacuation route by interacting with the support group's agents in real time based on the road flooding process,the density of people and vehicles,and the accessibility of disaster avoidance points during the evacuation process.And the destination disaster avoidance point,so as to more accurately simulate the actual flood prevention emergency evacuation decision-making process.The main research contents of the thesis are as follows:(1)In this study,the cellular automata(CA)model was used to simulate the confluence process under the typhoon and rain scenario.In view of the feature that cellular automata can perform parallel computing,GPU high-performance computing technology was combined with cellular automata to realize flood submergence simulation based on GPUCA model.(2)Based on the agent model and the shortest path search algorithm,this study created a dynamic evacuation model under storm and flood scenarios.Combined with the real-time calculation of flooding dynamics and road congestion,the model can dynamically modify the evacuation speed and evacuation route of the agent,so that the evacuation simulated by the model is more realistic.This study also used the CUDA framework to accelerate the model.(3)This research analyzed the storm and flood emergency plan,and analyzed its structural composition,extracted characteristic objects and scenarios,and proposes multiagent algorithm which based on scenarios in the flooding state,road passability,and dynamic change of emergency shelter capacity scenarios.(4)Developed a software system based on virtual reality technology.Taking the university town in Fuzhou as a typical case area,the above functions have been realized,and three system roles have been set up: commanders,disaster relief personnel and victims.People in disaster-prone areas choose victims Roles can be familiar with their own evacuation routes,and the role of commanders or disaster relief personnel selected by the emergency mitigation departments of governments at all levels can make command decisions through the system and verify the effectiveness of their own decisions.