甘肃岷县灾害之地理解析

Geographic Analysis of Disasters of Minxian,Gansu

通过资料分析、实地考察及灾害调查等方法,揭示了岷县地质灾害频发的根本原因在于其地理劣势:位于南北地震带,断裂发育;处于地貌梯度带,具备地质灾害高发的充分条件,其中包括多发灾害性天气过程;新生代的地层具有容易受到侵蚀和扰动的特征.此外,地形复杂、生态环境恶化、地质灾害常常呈链式发生,也是岷县地质灾害连绵不绝的原因.岷县具有各类地质灾害频发的历史,从而阻碍了该县的经济发展,低下的经济水平制约了当地建筑抵御自然灾害的能力,灾时损失颇显惨重,形成恶性循环.为了实现岷县发展的良性循环,提出了保持可持续性,认清其灾害背景和发展基础是非常重要的,对该地区灾后重建工作有借鉴意义.

In recent years, natural disasters occurred frequently in Minxian. Analysis based on field research and hazard survey shows that the root cause of frequent geological hazards in Minxian is its geographic disadvantages： the county, located in North-south seismic belt with many faults and landform gradient belt,is subject to geological hazards and a chain of consequent disasters initiated by its complex landform and adverse ecological environment. Frequent disasters constitute the major reason for the retardance of economic development in the county. Less advanced economy of the area hence restricts the construction of houses which withstand natural disasters. For a virtuous circle of economy and complete post-disaster reconstructions, the actual conditions of Minxian and the necessity of infrastructure construction have to be fully recognized.