汶川地震后北川干溪沟山地灾害及长期发展趋势初步分析

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	汶川地震后北川干溪沟山地灾害及长期发展趋势初步分析
	陈晓清; 李泳; 赵万玉; 崔鹏
刊名	四川大学学报(工程科学版)
	2010
卷号	42 期号:S1 页码:22-32
关键词	汶川地震山地灾害分布规律发展趋势
其他题名	Mountain Hazard Induced by Wenchuan Earthquake and Its Long-term Development Trends of Ganxi Gully,Beichuan
通讯作者	崔鹏
中文摘要	汶川地震在干溪沟内激发了大量的崩塌、滑坡。根据航空影像数据解译,干溪沟内发育成片的崩塌滑坡91块,总面积10.42 km2,占全流域的28.95%,而暂时没有泥石流活动痕迹。干溪沟内山地灾害在坡度、坡向、高程、断裂距离、地层岩性等方面存在如下规律:1)发生崩塌滑坡的坡度主要分布在30°～50°,随着坡度的增加,发生崩塌滑坡的概率越大;2)崩塌滑坡的坡向主要分布为向南方向;3)崩塌滑坡主要分布在1000～1600 m高程内,其中,1000～1 400 m尤其集中;4)绝大部分崩塌滑坡都分布距离北川断裂2 000 m或距离其他主要断裂1 000 m的范围内;5)T1f+t地层是"5.12"汶川地震的易发山地灾害地层。通过初步分析,预测干溪沟泥石流长期发展趋势为:1)总体呈活动强度下降趋势,可供形成山地灾害的松散固体物质来源总量呈下降趋势,泥石流总量下降;2)活跃期-平静期交替、活跃期逐渐缩短、平静期逐渐延长;3)泥石流活动类型表现震后一段时间内为输移控制型、然后为输移控制型向松散固体物质控制型过渡,最后发展成为松散固体物质控制型;4)汶川地震后第一个活跃期为10～15 a。干溪沟的山地灾害现状及其长期发展趋势分析为下一步制定减灾方案奠定了基础。
英文摘要	About 91 landslides induced by Wenchuan Earthquake were found in the ravine of Ganxi in Beichuan county,with a total area of 10.42 km2,28.95% of the whole drainage area,and without any debris-flow to be found so far.Some laws were found on the gradient,aspect,elevation,distance of rupture,and formation lithology of mountain hazard in Ganxi gully.The gradient of landslides is mostly 30° ～ 50°,and landslides are more likely to occur with the increase of their gradient.The aspect of landslides is mainly south.The altitude of those landslides is primarily 1 000 ～ 1 600 m,especially 1 000 ～ 1 400 m.The majority of landslides are around 2 000 m away from Beichuan fault or within 1 000 m from some other main faults.Most of the mountain hazards occur in the stratum of T1f + t.The long-term development trends of the debris flow in Ganxi gully were as follow.Its strength of activity will keep reducing with the decrease of loose granular materials and total amounts of debris flow.It would present an activity-quiet phase alternately and the quiet period will extend gradually.The debris-flow’s activity is transport-limited system right after the earthquake,followed by the transitional type between transport-limited system and weathering-linmited system and ultimately is weathering-linmited system.The debris flows will keep active about 10 ～ 15 years after Wenchuan earthquake.
学科主题	灾害学
分类号	X43
收录类别	EI ; CSCD
资助信息	国家重点基础研究发展计划(“973”计划)资助项目(2008CB425802);国家自然科学基金资助项目(40501008)
语种	中文
公开日期	2012-09-24
内容类型	期刊论文
源URL	[http://192.168.143.20:8080/handle/131551/4214]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
推荐引用方式 GB/T 7714	陈晓清,李泳,赵万玉,等. 汶川地震后北川干溪沟山地灾害及长期发展趋势初步分析[J]. 四川大学学报(工程科学版),2010,42(S1):22-32.
APA	陈晓清,李泳,赵万玉,&崔鹏.(2010).汶川地震后北川干溪沟山地灾害及长期发展趋势初步分析.四川大学学报(工程科学版),42(S1),22-32.
MLA	陈晓清,et al."汶川地震后北川干溪沟山地灾害及长期发展趋势初步分析".四川大学学报(工程科学版) 42.S1(2010):22-32.