Hazard Assessment of Debris Flows along G318 Sichuan-Tibet Highway
详细信息
- 责任者：Zou Qiang (Key Lab. of Mountain Hazards and Earth Surface Process ; Institute of Mountain Hazards and Environment ; CAS ; Chengdu 610041 ; China) ; Cui Peng
- 刊名：Journal of Mountain Research
- 出版年：2013
- 卷期：31(3)
- 页码：p.342-348
- 图表：3 illus., 2 tables, 21 refs.
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
摘要
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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