不同降雨量下基于宏观基本图的边界控制策略

Traffic Boundary Control Strategy Based on Macroscopic Fundamental Diagram Under Different Rainfall

在雨雪等不利天气条件下,城市交通拥堵加剧,北京、天津等大城市在降雨条件下经常发生多路段区域性交通拥堵。因此,根据天津市中心城区和市郊区域路网实际交通数据,以路网交通流宏观基本图模型为研究基础,对比不同降雨量以及不同路网的路网交通流时序和宏观基本图变化规律,分析不同降雨量对天津市中心城区和市郊区域路网交通状态的影响。基于不同降雨量下中心城区和市郊区域路网宏观交通流的变化规律,分别构建路网动态演化模型,并对模型的参数进行标定和有效性验证。针对降雨条件下路网发生的区域性拥堵问题,基于宏观基本图的边界控制分别设计了不同降雨量下中心城区和市郊区域路网控制策略,通过仿真实验分析验证了不同控制策略的效果,并给出了能够缓解中心城区和市郊区域路网拥堵的可行策略。结果表明:在小雨天气条件下,将从市郊区域向中心城区的交通流量的转移比例减小量控制在9%~50%范围之内时,中心城区与市郊区域交通状态更加均衡,路网调控效果更好;在大雨天气条件下,将从市郊区域向中心城区的交通流量的转移比例减小量控制在23%~50%范围之内时,中心城区与市郊区域交通状态更加均衡,路网调控效果更好。这表明该控制策略能够缓解中心城区和市郊区域路网的交通拥堵,保障路网交通系统的稳定运行。

Adverse weather such as rain and snow often aggravates urban traffic congestion,and large cities such as Beijing and Tianjin often experience multi section regional traffic congestion under rainfall conditions.There⁃fore,based on the real traffic data of the road network in the central and suburban area of Tianjin,with the macro⁃scopic fundamental diagram model as the research foundation,the paper compared the time series and the macro⁃scopic fundamental diagram changes of road network traffic flow for different rainfall and road networks.It analyzed the impact of different rainfall on the traffic status of the road network in the central and suburban area of Tianjin.The dynamic evolution models of the road network were constructed based on the change law in macroscopic traffic flow of the road network in the central and suburban area under different rainfall,and their parameters were also calibrated and validated.Aiming at solving the regional congestion problem of the road network,the control strate⁃gies of the road network in the central area and the suburban area under different rainfall conditions were designed based on the perimeter control of macroscopic fundamental diagram.The effectiveness of different control strategies was verified through simulation experiments,and feasible strategies were proposed to alleviate road network conges⁃tion in central and suburban areas.The simulation results show that:under light rain conditions,the traffic status between the central area and the suburban area is more balanced and the road network regulation effect is better when the transfer proportion of traffic flow from the suburban area to the central area is reduced within the range of 9%to 50%;under the condition of heavy rain,the traffic status of the central area and the suburban area is more balanced and the road network regulation effect is better when the reduction is controlled within the range of 23%to 50%.This shows that the control strategy can alleviate the traffic congestion of the road network and ensure the stable operation of the road network traffic system.