【作者】 任非凡； 谌文武； 韩文峰；

【Author】 REN Feifan~(①②)CHEN Wenwu~(①②)HAN Wenfeng~(①③)(①College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000)(②Key Laboratory of Mechanics on Western Disaster and Environment,Lanzhou 730000)(③Tianjin Institute of Urban Constrution,Tianjin 300384)

【机构】 兰州大学土木工程与力学学院； 西部灾害与环境力学教育部重点实验室； 天津城市建设学院；

【摘要】 陇南是我国泥石流的主要发育区之一,泥石流灾害严重影响了陇南地区的经济发展及其高等级公路的建设。通过对研究区地质环境进行详细的地质调查,查明该区地处青藏高原的东北缘,地质条件复杂、构造活动强烈、山高坡陡、降雨量大且集中、人类活动不合理,为泥石流的发育提供了先决条件。进而阐述研究区泥石流时空分布规律:空间上集中分布于白龙江干流及其一级支流岷江和北峪河3个流域;时间上主要集中在7、8月。结合研究区的具体情况筛选本次区划的影响因子及其赋值权重,包括岩土性质、与断层的距离、地震、坡度、相对高差、5～8月份降雨量、土地利用、植被覆盖率8个因子,然后应用GIS软件对研究区泥石流危险度进行区划并得到了良好的效果。研究结果对拟建国道212地质选线,制定灾害抢险、救灾和抗灾的途径和措施等具有一定的指导意义。更多还原

【Abstract】 Longnan in is one of the most famous areas for debris flow.The disaster has greatly hampered the economic development of Longnan and the construction of highway.Through detailed geological and environmental investigation of the area,the research area locates in the northeastern fringe area of hai-Tibet plateau,Complicated geological structure,intense structural activities,high and steep slopes,mass and concentrative rainfall and improper human activities provide necessary preconditions for debris flow disaster.Then we analyze spatial and temporal characteristics of the debris flow distribution synthetically.Debris flows mainly exist in the Bailong River,Min River(the first-level branch of Bailong River)and Beiyu River and appear in July and August.Finally,we filtrate eight regionalization factors and ascertain their proportion by considering factual condition,these factors include: rock and soil characteristics,the distance from falutages,seism,gradient,relative altitude,rainfall from May to August,soil using and vegetation coverage,then we use GIS to finish the regionalization result of debris flow danger degree and achieve a good result.The study will have some instructional meaning on how to choose route and estab- lish approaches and measures to deal with a geological disaster.更多还原