危险废物物流与“环境保护”和“公共安全”两大城市问题息息相关，优化设计危险废物物流系统是解决城市环境污染，提升防灾减灾救灾能力的重要途径。本项目特别注重环境风险的动态“防”与“控”，主要采用扩散模型、多商品流、多目标动态优化和仿真技术，研究城市危险废物物流系统的设计理论和优化方法。主要内容有：（1）基于城市路网结构，揭示环境风险的扩散过程和传播规律，并建立度量模型；（2）基于环境风险动态预防，建立符合城市属性的危险废物物流规划模型与优化方法，构建风险预警机制；（3）基于环境风险动态控制，确认城市路网的“重灾区”和“安全区”，建立危险废物物流系统的应急优化方法，完善风险控制机制。本项目拟融合环境、管理和交通运输学科的理论方法，阐明环境风险的动态扩散机理，从风险的“事前预防”和“事后控制”两个维度，完善城市危险废物物流系统优化的理论方法体系，为政府推行防灾减灾救灾体制机制改革提供决策支持

Hazardous waste logistics plays a key role in the urban management problem of "environmental protection" and "public safety". The design and optimization of hazardous waste logistics is considered as the efficient way to reduce the urban environment pollution, and to enhance the ability of disaster avoidance, reduction and rescue. In this project, we especially focus on the dynamic prevention and control of environmental risks, applying diffusion model, multi-commodity flow formulation, multi-objective dynamic optimization and simulation to develop the theory and method in the field of optimization of urban hazardous waste logistics. In which, (1) the diffusion mechanism of the environmental risk as well as the corresponding dynamic assessment is developed in accordance with the characteristics of environment and urban network structure, also the environmental risk assessment is formulated; (2) Considering the nature of the city, we develop the model and methodology for the urban hazardous wastes logistics optimization based on the environmental risk dynamic prevention, and then the corresponding risk avoidance policy is proposed; (3) Figuring out the severely afflicted area and safe area, we develop the corresponding emergency model to control the existing impacts on the environment, where the risk control methodology is also improved. With the support of this project, the methodologies of environmental engineering are introduced to the management science and traffic transportation for the environmental risks diffusion analysis and simulation. Then, a new methodology, including the potential risks avoidance before incidents, the existing risks control and reduction after incidents, is proposed for the security and safety of the hazardous waste management. The related methodologies, plans and results can fulfill the theoretical and methodology system of urban hazardous wastes logistics optimization, and provide recommendations for the government to innovate the policies of disaster prevention, reduction and relief.