A Study On Container Truck Scheduling And Expansion Model Under The Port Environment Constraint

With the gradual recovery of world economic trade,container transportation is becoming more and more busy,and the air pollution generated by the port during transportation is becoming more and more serious.It even poses a great threat to the health of the staff in the port area and the atmospheric environment safety of the city where the port is located.For this reason,China has issued a series of policies and regulations to divide pollution control areas,implement air pollutant emission control measures,continue to promote port non-road mobile source pollution reduction,and vigorously promote the sustainable development of port green energy conservation.Therefore,it is urgent to carry out energy conservation and emission reduction work for port transportation equipment.As the most important collection and distribution tool in the port area,container trucks are one of the main sources of air pollution in ports.Its emission reduction has important practical significance for reducing port pollution emissions and improving port operation efficiency and atmospheric environmental safety level.Firstly,based on the port container throughput data,the paper analyzes the domestic and foreign literatures,combined the field research results to take the emission factors and possession of container trucks under different working conditions into account and estimated the inventory of tailgate pollution emissions from the port.Through the analysis of AIS data,the ship emission inventory and the corresponding spatio-temporal distribution characteristics are obtained.By using the Gaussian model,the paper constructs a throughput-based port pollution estimation method.The result shows that in terms of time distribution,the total amount of atmospheric pollutants reached the highest value in November,while it was at a low level in March,the emission law is basically consistent with the laws of human social activities.Meanwhile,in terms of spatial distribution,ship emissions are concentrated in the vicinity of waterways and berths,while truck exhaust emissions are denser in shore bridges and yard areas.Further using the Gaussian model to evaluate the impact of atmospheric pollutants in the port area as a receptor,the analysis shows that the daily average concentration of various pollutants in the region has far exceeded the national standard,and it is necessary to take effective measures to reduce air pollution in time.This study laid the foundation for the subsequent truck optimization path optimization model and the establishment of the truck long-term planning model.Secondly,the paper constructs an container truck shortest path scheduling optimization model under port environment constrained.In view of the current pollution situation,the operation mode of the loading and unloading process in the port area is taken as the research object.Considering the physical conditions of the port area and the container loading and unloading demand,the minimum discharge of the port area is taken as the model target,and the container loading and unloading tasks are allocated and collected under different requirements.The driving path is the decision variable,and the environment-oriented shortest path scheduling optimization model of the truck is established.The pollution control,the no-load rate and the total driving distance of the two different loading and unloading modes are analyzed to optimize the working mode.The results show that,compared with the single-ship independent loading and unloading mode,the multi-ship hybrid cross-operation mode can effectively reduce the pollution discharge in the port area,shorten the transportation distance of the trucks,reduce the no-load rate of the truck,and improve the port.Transportation efficiency of the district.Finally,a long-term expansion planning model of the truck under port environment constrained is constructed.Taking the minimum total transportation cost of the inland transportation system as the objective function,the atmospheric environment risk of the entire port area and the loading and unloading task requirements of the completed throughput are taken as the main constraints,and different scenarios are designed.Based on the interval mathematics planning method,various containers are obtained.A reasonable timing for truck expansion and a specific solution for container throughput allocation.Based on this,the model establishes an environment-oriented container truck expansion planning model.The results show that if no emission reduction control measures are implemented in the next 9 years,the growth rate of pollutants in the port area can exceed 20%,so in the second stage planning period,it can be controlled by purchasing new energy trucks and installing on-board emission reduction facilities.Pollution emissions,although the system cost has increased,but the atmospheric environment quality of the port area can maintain the current level in the future.In summary,this paper establishes the idea of “Atmospheric Risk Research in Port Area – Optimization of Transportation Path at Present Stage – Long-term Capacity Expansion Planning”.The model results can provide scientific decision-making programs and effective suggestions for the environment-oriented green port traffic environment system and future planning and construction,which is conducive to promoting the sustainable development of ports and accelerating the optimization and upgrading of port vehicles.It is of theoretical and practical significance to promote the further development of energy saving and emission reduction in port collection.