ZOU Qiang,CUI Peng,YANG Wei.Hazard Assessment of Debris Flows along G318 Sichuan-Tibet Highway[J].Mountain Research,2013,(03):342.





Hazard Assessment of Debris Flows along G318 Sichuan-Tibet Highway
1. 中国科学院水利部成都山地灾害与环境研究所/中国科学院山地灾害与地表过程重点实验室,四川 成都 610041;
2. 中国科学院大学,北京 100049;
3. 西南科技大学环境与资源学院,四川 绵阳 621010
1. Institute of Mountain Hazards and Environment / Key lab. of Mountain Hazards and Earth Surface Process,CAS,Chengdu 610041,China;
2. University of Chinese Academy of Sciences,Beijing 100049,China; 3. College of Environmental and Resource,SWUST,Mianyang 621010,China
Sichuan-Tibet highway debris flow hazard assessment information acquisition analysis
以野外调查为基础,选取坡度、地表起伏度、岩石抗剪强度指标(内摩擦角与粘聚力)、距断裂距离、地震烈度、岩体风化程度、最大24 h降雨量、年平均气温、土地利用类型等10项指标作为基本判别因子,分析泥石流对影响因子的敏感程度。研究表明,G318川藏公路最有利于泥石流发育的条件为:1.坡度:20°~35°;2.地表起伏度:100~300 m;3.岩石抗剪强度指标:内摩擦角<35°,粘聚力0.4;5.距断层距离:0~10km;6.地震烈度:大于Ⅶ度;7.土地利用:荒漠草原、冰川、裸岩砾石、坡草地;8.年平均气温:40 ...
This article analyzes the susceptibility of debris flows along G318 Sichuan-Tibet highway,and the results show the favorable geological and geomorphological conditions for debris flow occurrence,which includes: 1.hill slopes from 20° to 35°,2.relative elevation between 100 m and 300 m,3.for rocks’ shear strength indexes,angle of internal friction is lower than 35°and cohesive force is below 25 MPa,4.weathering degree of rock stratum should be above 0.4,5.the distances to faults within 10 km,6.the earthquake magnitude is above 7.0,7.land use types including desert steppe,glacier area,bare rock land,and slope grassland,8.annual mean temperature is located below 8° and between 10° and 12°,9.maximum daily rainfall is larger than 40 mm. Through adopting information acquisition analysis method for the above selected factors,the hazard degree of debris flow was evaluated,and debrisflow hard mapping of Sichuan-Tibet highway was completed with support of GIS technique. The proposed method divides the hazard degree along the highway into 5 levels: very low,low,medium,high and very high. The high hazardous areas along G318 Sichuan-Tibet highway are mainly located in the medium,high,very high levels,which account for 71.99% of the whole highway area. They are located in the canyon area of Dadu River,Jinsha River,Lanchang River,Nu River and Palongzangbu River. Referring to these areas,the debrisflow prevention project should be strengthened in road construction and land designing. While the very low hazardous areas are relatively small,accounting for only 4.21%,which are located in the sections of Chengdu plain area and Tibetan plateau area. The analyzed results above are consistent with results from the actual debris flows situation along Sichuan-Tibet highway. Thus,this hazard evaluation results are suitable for providing debris flow risk analysis and line selection for new road.


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收稿日期(Received date):2012-12-10;改回日期(Accepted) : 2013-02-04。
基金项目(Foundation item):国家自然科学基金重点
基金项目(41030742),国家基础研究重点计划(973)项目(2011CB409902),中国科学院“西部之光”人才培养计划项目(Y3R2440440)。[This research is supported by the Key Project of National Natural Science Foundation of China (Grant No. 41030742),the National Program on Key Basic Research Project (973 Program) ( Grant No. 2011CB409902),“Western Light”Talents Training rogram of CAS(Grant No.Y3R2440440).]
作者简介(Biography):邹强(1982-),男,讲师,主要从事山地灾害与GIS研究。[Qiang Zou (1982-),male,instructor,major in mountain hazards and GIS.] E-mail: zouqiang@swust.edu.cn *通信作者(Corresponding author):崔鹏(1957-): 博士,研究员,研究方向: 自然地理、山地灾害和水土保持。[Peng Cui (1957- ): Ph D,professor,specialized in physical geography,mountain hazards,water and soil conservation.] E-mail: pengcui@imde.ac.cn
更新日期/Last Update: 1900-01-01