Multimodal Emergency Logistics Hub Site Selection And Route Planning Study

With the rapid development of information technology and productivity levels,the increase in population mobility and resource consumption has led to a certain degree of regional social and ecological environmental volatility,and a trend towards the normalisation of sudden public health events with complex causes and high social impact.At the same time,people are becoming more aware of life and health and have higher expectations of their standard of living.This requires society and the government to deal with public health emergencies quickly and with high quality to protect people’s lives,reduce property damage and maintain social stability.The most fundamental aspect of practical urban emergency management is the rational co-ordination and transfer of resources,with policy,financial and technical support from the state and society respectively.With the help of many social forces and macro support,the location of logistics centres and the optimisation of end distribution routes can improve the efficiency of emergency supplies,reduce casualties and ensure the effective supply of supplies.Based on this,this thesis investigates the construction of a logistics network focusing on the location of hubs and end distribution routes by considering multimodal transport and the establishment of hubs in the event of a public health emergency.Firstly,we summarise and analyse the current state of research on emergency site selection,material distribution and logistics network layout at home and abroad,and summarise the possible references and shortcomings of the existing literature,and propose the main research content and implementation methods of this thesis.The thesis also presents an in-depth review of the relevant theories and explains the key issues in emergency logistics,especially in the construction of emergency logistics networks.Secondly,after determining the stage of development of public health events,the emergency logistics network constructed in this thesis was studied.Firstly,the four characteristics of a medium-term emergency logistics network,namely stable and predictable demand,stable supply,long duration and ease of congestion,are extracted;transport modes,hub points and distribution routes are analysed separately in relation to the emergency logistics capacity.In terms of transport modes,the thesis identifies the use of combined transport.In practical application,inter-city and intra-city delivery conditions are different,so different transport modes are also used to combine;in terms of hub site selection,the thesis composes a multi-objective site selection model based on transport costs,site selection costs,customer satisfaction and service capacity of emergency facilities,after sorting out the factors and classical models considered in the site selection problem;in terms of distribution In the distribution route problem,a detailed analysis of the distribution access capacity is carried out,and the matching of transport modes is carried out from three perspectives: demand point,road condition and carrier capacity,and the final matching results are obtained by using an example analysis.Finally,in order to meet the dual requirements of supply and low cost during the recovery phase of a health emergency,this thesis combines the location of emergency care centres and the planning of routes for the distribution of emergency materials,distinguishing different decision objectives for the two problems,so as to obtain a twolevel planning model.On this basis,the genetic algorithm is used to check the model’s suitability and the algorithm’s efficiency,to select a suitable supply node in the upper supply city and to determine the routing plan in the lower distribution network.In this thesis,we develop a two-level planning model to solve the problem of emergency material supply in the health sector.The scope of multimodal transport is expanded in terms of transport modes,and diversified multimodal transport modes are achieved in the upper supply system and the lower distribution network through intermodal or combined transport.The intermodal transport system has been extended by the creation of nodes.As far as nodes are concerned,the types of nodes have been expanded,which proves that a reasonable increase in the number of distribution centres in a given area can effectively improve logistics efficiency.In future research,the same scenario of demand points can be considered in the model of multi-category material transport and multimodal transport services.