【作者】 张明媛；

【导师】 周晶； 袁永博；

【作者基本信息】 大连理工大学 ， 土木工程管理， 2008， 博士

【摘要】 城市作为巨大的承灾体,日益成为国际社会防灾减灾的中心和重点。城市灾害的多样性、频繁发生与其造成的各种损失和破坏的严重化趋势,已经对城市经济社会发展构成重大威胁,城市对灾害的预测、防御、救助及灾后恢复的综合能力,直接决定了城市可持续发展的基础和能力。人们对城市灾害综合风险的正确评估和科学合理的管理成为实现减灾的最好手段。本文针对城市承灾能力评价和风险分析中的一些关键问题作了以下几个方面的理论和方法研究:(1)从承灾体角度对城市系统的功能性进行了分析。分别判断了城市社会子系统、经济子系统和环境子系统在受灾后的表现和功能影响,以及子系统内部的各重要要素。(2)在城市承灾体功能性分析的基础上,对城市的综合承灾能力进行研究探讨,提出防灾能力、抗灾能力、救灾能力和灾后恢复能力构成了城市综合承灾能力。建立了城市承灾能力评价指标体系,其中重点添加了以往评价中忽略的城市环境因素。对比分析了全国29个省会及直辖城市的承灾能力,并利用模糊评价对其进行了等级划分,得出这些城市整体的承灾能力较低,需尽快加强城市综合承灾能力建设的结论。(3)在风险分析的基础上,提出了“网络均衡性”的概念,建立了网络均衡度计算模型。通过综合考虑节点网络结构重要性和功能重要性,判断网络节点的综合重要性,并基于熵原理进行了网络均衡性的实例计算,得到了与原结论一致的分析结果。计算过程表明:该方法简单,避免了以往利用连通可靠性评价网络的复杂数学计算过程。该方法也解决了以往城市生命线抗灾能力只用经济型指标评价的不精确问题。(4)建立了生命线多功能系统的耦合关联矩阵,提出了判断耦联关系的量化方法。通过生命线多功能耦合系统的脆性关联分析来判断由于子系统在结构、功能上的关联造成其破坏和灾后恢复的相互影响性,解决了以往耦联关系多是定性评价的问题。从整体上评价了城市生命线系统的抗灾能力,得出了灾害下城市生命线系统间的关联性从强到弱为:通讯系统、电力系统、交通系统、供气系统和供水系统。这一结果说明灾害下通讯系统的自身功能破坏对其他系统的影响最大,并得到了无论哪个系统破坏,都会影响城市供水系统的结论。为城市灾后生命线系统的恢复工作提供了理论依据。(5)建立了城市灾害综合风险评价模型。从风险具有和代表的不确定性和复杂性入手,将城市灾害综合风险看作是基于危险性和易损性的不确定系统,通过判断各自的确定及不确定影响因素指标,基于集对分析中同一、对立和差异度的思想,建立了城市灾害综合风险评价模型,并利用客观的降维方法——投影寻踪确定了因素的权重,降低风险分析问题的复杂性。应用改进的遗传算法计算有约束条件的优化问题,得出了较满意的降维结果。重点研究了集对联系度中的差异性系数的客观量化方法,将其偏向性和偏向程度加入风险不确定性的计算中,得到了风险阈值的范围,进而得出了风险不确定性的大小。利用该方法对大连市做了动态风险分析评价和趋势预测,并得出大连市的城市灾害期望损失值产生的可能性为50.77%的结果。该方法解决了以往灾害风险分析中多需要历史灾害数据或大样本数据的问题,为更多的分析目标物风险提供了可行方法。(6)提出了城市承灾系统灾害“放大效应”风险的评价方法。基于脆性熵原理计算出城市承灾系统的脆性熵,来判断我们灾后对城市的控制能力。将突变理论应用于脆性熵的计算过程中,解决了脆性因子崩溃概率难以获取的问题。同时,在对城市灾害系统的脆性分析过程中,可以得出在同一时间内,城市各种灾害发生的相对可能性大小,为有针对性的进行防灾减灾工作提供了判断依据。对大连市的城市灾害脆性风险熵进行了计算,得出了该城市灾害“放大效应”风险的发展趋势,结果表明我们对城市灾后的控制力将相对越来越弱,符合城市化进程的发展规律。(7)提出从灾害组织结构管理角度对风险管理中人力资源进行管理。通过利用已有方法对比分析了上海市和洛杉矶市的灾害组织管理结构情况,建立了组织结构优化的概念模型。提取出合理进行组织结构中部门整合的建议。(8)建立了应急管理信息系统的初步模型。提出了应急管理信息系统的建立目的不是为了预测和估算,而应是起到当灾害发生时,对已造成的灾情局面做快速反应的辅助功能的观点。分析了城市灾害应急管理的作用和实质工作,利用SuperMap软件开发了某地区应急管理信息系统的一些功能。(9)进行了防减灾投入与城市经济发展水平协调性分析,提出从协调性管理进行财力资源管理的观点。结合灰关联度和灰色预测模型GM(1,n)对大连市综合承灾能力与经济发展水平协调性进行了分析。通过假设论证,找到了城市承灾能力与经济发展水平不协调的原因是由于承灾能力形成的滞后性,并利用经典的Daniel趋势函数判断了两者之间的发展趋势同步性。更多还原

【Abstract】 The urban is getting more and more central and important to international society disaster defense and reduction as a huge disaster bearing body. The diversity of frequent urban disaster as well as the severity of lost and damage have threatened to the development of urban economic society. The integrative capability of disaster prevention, defense, salvation and resilience directly reflected on the base and capability of urban sustainable development. The reasonable assessment and management of urban natural disaster were the best way of people completing disaster mitigation.The thesis focuses on some key technology of assessment of urban disaster-carrying capability and risk analysis and the following aspects are devoted to the main effects:(1) The city systematic functionality is analyzed from the sight of disaster carrying body. The performance and functional affection of urban society sub-system, economic sub-system and environment sub-system after disaster are analyzed as well as the important factors inside.(2) Based on the analysis of functionality of urban disaster carrying body, the comprehensive disaster carrying capability in urban place is discussed with the result that the capability is constituted of disaster prevention, disaster defense, disaster salvation and resilience. The index system of urban disaster carrying capability assessment is found with the addition of environment factors which are always ignored. The disaster carrying capability of twenty-nine major cities are compared with each other and we get the conclusion that they are all a little low after fuzzy estimation so that they need to be improved with strenghthing the integrated disaster carrying capability.(3) Based on the risk analysis, a concept named " net proportionality" is raise up to model the calculation of net proportionality. After considering synthetically nod structural importance and functional importance for estimating the integrated importance of net nod, the net proportionality of an example is calculated based on entropy theory. The result is the same as the present one. The process of calculation showes that the method is simple avoiding the complex mathematic calculation of connecting reliability for network estimation. It also resolves the imprecise problem of using the economic index to do estimation of disaster defense of urban lifeline before.(4) The coupling associate matrix of lifeline multi-functional system is set up for quantifying the coupling relationship. The interaction of destroying and resilience after disaster caused by sub-systems on structural and functional association are judged through the crisp associating analysis of lifeline multi-functional coupling system. The disaster defense of urban lifeline system is estimated as a whole and the association under disaster from strong to weak is: communication system, electric power system, transport system, gas system and water system. The result showes that the affection of communication system to other systems is the most if its functionality was destroyed under disaster, and the water system would be affected whatever which system destroyed.(5) The estimating model of urban disaster comprehensive risk is set up. The paper takes the urban integrated disaster risk as an uncertain and complex system containing hazards and vulnerability, modeles the risk assessment with the set pair analysis approach after ensuring the certain or uncertain factors and ensures the weight using project pursuit approach which is an objective dimension-decreasing method good for reducing the complexity of the risk analysis. The improved genetic algorithm is used to solve the optimize problem with restriction to get an satisfying result of dimension-decrease. The objective quantify method of otherness coefficient in set pair affiliation is paid more attention. Its deflection is used in the calculation of risk uncertainty for getting the threshold of risk and the uncertainty value further. The dynamic risk in Dalian is analyzed and the trend is forecasted using this method as well as the result that the probability of expectation loss of risk in Dalian is 50.77%. This approach resolved the problem that much more history disaster data or samples data is need for disaster risk analysis.(6) The assessing approach of "blown-up" risk of urban disaster carrying system is developed. The crisp entropy of urban disaster carrying system is calculated for judging our control capability. Taking the use of mutation theory in the calculation of crisp entropy, the problem of crisp probability of crisp gene is solved. Mean time, during the crisp analysis of urban disaster system, the relative probability of each kind of disaster also could be gotten for providing the reason of pertinence disaster prevention and mitigation work. The crisp risk entropy of urban disaster in Dalian is calculated to get the developing trend of "blown-up" risk of urban disaster which presentes that our control of urban after disaster would getting weaker according with the developing rule of citifying.(7) The human resource management is presented from the sight of disaster organization structure. A concept model of organization structure optimization is set up after using a present approach for the analysis of the disaster organization management of Shanghai and Los Angeles.(8) Modeles an emergency management information system. A point is presented that the aim of setting up emergency management information system is assisting the quick reaction to the situation of a disaster instead of forecasting and estimating. The software SuperMap is used to develop some function of an emergency management information system after the effect and real work of urban disaster emergency management is analyzed.(9) A point of managing financial resource from the sight of coordination management is presented as well as the analysis of coordination between disaster prevention and mitigation investment and economic development. Combining the grey association and grey forecast model, the coordination in Dalian is analyzed. After supposing argumentation, the reason of un-coordination between urban disaster carrying capability and development proved is the hysteresis of disaster carrying capability. And the developing trends are also judged by classic Daniel function.更多还原