汶川地震对白龙江流域地质灾害的影响——以武都区构林坪为例  

Impact of Wenchuan earthquake on geo-hazards in Bailong River Basin:a case study of Goulinping Valley,Wudu County

作　　者：郭鹏[1] 孟兴民[1] 薛亚婷[1] 熊木齐[1] 赵岩[1] 

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2015年第3期313-318,326,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家科技支撑计划项目(2011BAK12B06);甘肃省科技重大专项计划项目(1102FKDA007)

摘　　要：选取位于白龙江地质灾害最严重的中游区域,且受人类影响较弱的典型泥石流沟构林坪为例,基于SBAS InSAR技术监测分析2008年"5.12"汶川特大地震前后该流域的地表形变特征.研究发现横穿该流域上下游分界处的迭部-白龙江断裂自2008年前以8.0 mm/a的相对速率稳定抬升,在震后迅速增至11.5 mm/a.根据资源卫星、Geoeye,SPOT影像调查资料,与InSAR结果相应,该流域地质灾害的增幅明显上升.地震对地质灾害的作用表现为直接激发作用和潜伏后发作用,在白龙江流域,汶川地震不仅直接引发大量次生地质灾害,还使该流域的岩土结构、强度等遭到破坏,孕育大量潜在灾害,使该地区地质灾害长期并将会频繁发生,次生灾害的分布具有"上盘效应"和沿断裂带集中分布的特点.A detailed study was made of Goulinping Basin,a typical debris flow in the middle reaches of Bailong River,a most serious geological hazard area with relatively little human influence.Based on SBAS InSAR monitor technology,an analysis of the characteristics of the basin surface deformation was made of the conditions before and after the Wenchuan earthquake on May 12,2008.The study found that the rate of the relative movement between the upper wall and foot wall of the Diebu-Bailongjiang fault across the Goulinping Basin between the upstream and downstream boundary was 8.0 mm/a before 2008,and then it rapidly increased to 11.5 mm/a after the earthquake.According to the survey data of the resource satellite Geoeye,SPOT image and corresponding results of InSAR,the geological hazard growth also increased obviously.Earthquake acted on geohazards in two ways,causing direct or immediate destruction of the rocks first and occurring after a long time.In the Bailong River Basin,Wenchuan earthquake not only caused a large number of secondary geological disasters,but at the same time,destroyed the basin structure,the intensity of rocks and soil,resulting in potential hazards mainly distributed along the fault zone and on the upper wall.Therefore,the geological hazards in this area will last for a long time and be frequent.

关 键 词：SBAS INSAR 地质灾害 汶川地震 构林坪 白龙江 

分 类 号：P694[天文地球—地质学]