基于元胞传输模型的区域疏散动态交通分配

为制定合理、高效的灾害条件下区域疏散交通管理与规划方案,针对道路交通应急区域疏散的动态交通分配问题进行研究.首先,采用元胞传输理论和单终点疏散方法,建立了元胞-连接桥疏散路网模型,进而以系统疏散出行时间最短为目标函数,以元胞流量守恒和流量传播等为约束条件,构建了区域疏散动态交通分配线性规划模型.对该模型的求解可以得到系统最优疏散出行时间、疏散清空时间、分阶段疏散优先权分配方案、交叉口车流诱导方案以及疏散者终点选择和路径选择最优方案.案例分析的结果表明,该模型即能够满足大规模疏散路网建模的需求,同时又能恰当地反映疏散交通流的动态特性.

Dynamic regional evacuation traffic assignment based on cell transmission model

In order to present reasonable and effective traffic planning and management strategy under disaster conditions,the dynamic regional evacuation traffic assignment during the process of road transportation emergency planning and operations was studied.First,a cell-connector model for evacuation road network modeling was presented based on the revised cell transmission model.Then,we constructed a dynamic regional evacuation traffic assignment model with the minimal evacuation travel time as its object function and cell flow conservation and propagation as its major constraints.By solving this model,we can obtain the system’s optimal travel time,network clearance time,optimal flow staging at origins,optimal flow distribution at intersections and optimal evacuation route choice and destinations.Results of a case study show that this presented model can meet the modeling demand of mass evacuation road network and effectively describe the dynamics nature of evacuation traffic flow.