Influence of composite disaster chain topological structure on risk of disaster evolution network
To investigate the influence of the composite complexity of topological structures in disaster chains such as linear chain,divergent chain,convergent chain,and cyclic chain on the risk of disaster evolution network and the acting mechanism of risk mitigation through chain disconnection,the disaster evolution networks were categorized into four types of α,β,γ,and δ based on the composite complexity of disaster chains. Then,the relationship between the risk level of disaster evolution net-works and their complexity under the determined number of disaster nodes was simulated by using the assessment model of disaster evolution risk,and the risk characteristics of four types of networks were analyzed. Finally,the acting mechanism of risk mitigation through chain disconnection was revealed. The results show that under a constant number of disaster nodes,there is a certain positive correlation between the risk level of disaster evolution networks and their complexity. Specifically,α-type networks exhibit the lowest risk levels,β-type networks have high risk suppression effect,γ-type networks demonstrate explosive risk characteristics,and δ-type networks possess both explosive and persistent risk characteristics. The mechanism of risk mitigation through chain disconnection involves decoupling and class reduction,thereby lowering the risk level of disaster evolution networks. The research results can provide theoretical support for revealing the acting mechanism of chain discon-nection to prevent risks.
disaster chaintopological structuredisaster evolution networkrisk prevention and control
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