Abstract
This paper analyzes the formation mechanism of urban hazard chains. The results demonstrate that the complex interaction between the disaster-bearing bodies under the action of disaster-causing factors is the direct cause of urban hazard chains. The analysis of the energy effects of urban hazard chains shows that the coupling of the excitation energy released by the causative agent and the energy of the disaster-bearing bodies is the fundamental cause of urban hazard chains. Based on the description of the dynamical mechanism of the urban disaster chain system, this paper first sets up a disaster scenario and considers the effect of the time lag to establish a system dynamics model of the urban disaster chain and urban disaster management. The model of urban disaster management system dynamics shows the mutual influence and complementary relationship between disasters and the economy, pointing out that emphasizing the spill-over effects of disaster management systems can improve the effectiveness of disaster mitigation. This study also uses equilibrium entropy and brittle entropy theories to characterize the vulnerability of single-function networks and the degree of brittle association of each lifeline subsystem, respectively, and establishes a model for assessing the sensitivity of lifeline systems to disaster damage. Built on the collection and feedback of information from disaster areas after the occurrence of emergencies, this paper establishes a deterministic multihazard emergency resource dispatches model and an uncertain multihazard emergency resource dispatch model.
Highlights
Academic Editor: Zhihan Lv is paper analyzes the formation mechanism of urban hazard chains. e results demonstrate that the complex interaction between the disaster-bearing bodies under the action of disaster-causing factors is the direct cause of urban hazard chains. e analysis of the energy effects of urban hazard chains shows that the coupling of the excitation energy released by the causative agent and the energy of the disaster-bearing bodies is the fundamental cause of urban hazard chains
Based on the description of the dynamical mechanism of the urban disaster chain system, this paper first sets up a disaster scenario and considers the effect of the time lag to establish a system dynamics model of the urban disaster chain and urban disaster management. e model of urban disaster management system dynamics shows the mutual influence and complementary relationship between disasters and the economy, pointing out that emphasizing the spill-over effects of disaster management systems can improve the effectiveness of disaster mitigation. is study uses equilibrium entropy and brittle entropy theories to characterize the vulnerability of singlefunction networks and the degree of brittle association of each lifeline subsystem, respectively, and establishes a model for assessing the sensitivity of lifeline systems to disaster damage
Because of the enormous damage caused by urban disasters and the increasing amplification effect of urban disasters with the accelerated urbanization process, this paper first analyzes the city as a specific disaster-bearing body, based on the evolution of the disaster chain and using the system dynamics research method
Summary
Received 20 April 2021; Revised 28 May 2021; Accepted 4 June 2021; Published 11 June 2021. A large number of disaster prevention and mitigation practices at home and abroad have shown that correct disaster risk assessment results are the basic basis for the optimal configuration and orderly construction of the three major disaster prevention and mitigation countermeasure systems-monitoring and forecasting system, defense system, and emergency relief system-in the time domain, and the practice of regional economic construction and social development has put forward the urgent need to strengthen the study of regional disaster risk assessment theories and methods [7]. As single-hazard research methods and sectoral disaster management models are becoming increasingly incompatible with the characteristics of urban disasters, changing from single-hazard prevention to integrate disaster prevention and mitigation is an inescapable requirement of urban disaster laws [12]. Comprehensive urban hazard risk assessment remains a burning issue in disaster research. e practice of disaster research at home and abroad has shown that it is not realistic to predict and prevent disasters from occurring with complete accuracy and that it is only appropriate to adopt effective disaster risk assessment and management strategies
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