Abstract
The consequences of a hazmat accident can be catastrophic due to the characteristics of hazardous materials. Different from the models, which are constructed from the perspective of “government-carrier”, this paper considers the three objectives of the risk, the cost, and the compensation cost from the “government-carrier-public” perspective, so as to construct a route optimization model of hazmat transportation considering risk equity. Moreover, considering that the difference in regional emergency response time will significantly affect the risk, this research incorporates the emergency response time into the transportation risk assessment function, and realizes risk equity by minimizing the total compensation cost based on the difference in regional emergency response time. To solve the proposed model, a multi-objective genetic algorithm based on linear weighting is designed. The results obtained from the case study verify the necessity of considering the risk equity in the route optimization model of hazardous materials transportation and prove that the established model and algorithm can find an optimal route that meets the expectations of the government, the carrier, and the public.
Highlights
Hazardous material refers to any type of substance that is capable of causing harm to people, property, or the environment
The main contributions of this study are that the emergency response time of the emergency departments around the link is included in the transportation risk assessment function
For the route optimization of multi-variety hazmat transportation, the transportation of different varieties of hazmat are independent of one another; second, because these three objectives are often in conflict, they cannot reach the optimal conditions at the same time; after deterministic transformation of the model constructed under an uncertain environment, a multi-objective genetic algorithm based on linear weighting is designed to solve the problem
Summary
Hazardous material (hazmat) refers to any type of substance that is capable of causing harm to people, property, or the environment. Some literature [1,2,3] on route optimization of hazmat transportation usually establish a model considering the transportation risk and transportation cost from the perspectives of “government-carrier”. When assessing transportation risk in the route optimization model of hazmat transportation, studies [6,7,8,9] have adopted the population exposure risk approach They mostly select the optimal route from the perspective of ex-ante planning, ignoring the importance of ex-post processing. By integrating the emergency response time, we present a more practical risk assessment approach in order to construct a route optimization model of hazmat transportation from the perspective of ex-post processing. The computational results of the numerical study are presented and analyzed in Section 5, before ending with the conclusions and future research
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