基于脆性熵的城市生命线灾损敏感性评估

来源期刊:中南大学学报(自然科学版)2016年第8期

论文作者:徐文彬 刘爱华 吴超

文章页码:2793 - 2802

关键词:城市生命线;灾损敏感性;评估方法;节点;脆性熵

Key words:urban lifeline; damage sensitivity; assessment method; node; brittleness entropy

摘    要:为了对城市生命线在灾害作用下的高度敏感性和耦合放大性进行全面的评估,引入脆性熵理论对城市生命线的灾损敏感性进行研究。在界定承灾体脆弱性和灾损敏感性概念的基础上,构建城市生命线灾损敏感性评价指标体系。在综合考虑网络节点的结构重要性和功能重要性的基础上,用网络的实际均衡熵与系统最大熵的比值建立单功能网络结构灾损敏感性指数的计算模型。从影响机理入手,对各生命线子系统之间不同作用类型进行划分,并构造相应的布尔型矩阵,利用脆性熵理论分析各生命线子系统之间的脆性关联程度,得到生命线系统整体网络结构的灾损敏感性计算模型。从质量灾损敏感性和网络结构灾损敏感性2个方面建立城市生命线的灾损敏感性评估模型。研究结果表明:各子系统之间的脆性关联会使得城市生命线的灾损敏感性增加;在受到灾害破坏时,通讯系统与其他子系统的脆性关联最大,在灾后应该抢先修复。

Abstract: To conduct the comprehensive assessment for the high sensitivity and the coupling amplification of urban lifelines during disasters, the theory of brittleness entropy was applied to study the damage sensitivity of urban lifelines. On the basis of defining the concept of the vulnerability of and damage sensitivity of hazard-affected bodies, the evaluation index system of damage sensitivity of urban lifelines was built. After comprehensively considering the importance of the structure and the function of lifeline network nodes, the calculation model of the damage sensitivity index of mono-functional network structure was established with the ratio of the actual equilibrium entropy to the maximum entropy of the urban lifeline network. Starting from the impact mechanism, the Boolean matrix of the different kinds of influence ways was constructed according to the different mutual influence methods between the lifeline systems. The brittleness relevance degree of the lifeline subsystems was analyzed using the theory of brittle entropy. And the model was gotten to calculate the damage sensitivity of the whole network structure of urban lifeline. The damage sensitivity evaluation model of urban lifeline was established from two aspects of the quality damage sensitivity and the network structure damage sensitivity. The results show that the brittleness connection between the subsystems can increase the damage sensitivity of urban lifeline. The entropy of brittleness connection is the largest between communication system and other subsystems. After the disaster, it should be first repaired.

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