青藏高原鲜水河活动断裂带蠕变斜坡地质灾害InSAR识别研究

发布时间：2018-07-04 06:27

本文选题：鲜水河活动断裂 + 地质灾害识别　；参考：《地质学报》2017年08期

【摘要】：断裂带附近往往是蠕变斜坡地质灾害的多发区,微小变形是指示蠕变斜坡地质灾害的一项重要标志。本文以青藏高原鲜水河活动断裂带为研究区,选用多期ALOS/PALSAR合成孔径雷达数据进行时序干涉(InSAR)观测,获得了毫米级的地表变形量,结合现场调查、遥感解译和地质条件综合分析,揭示了该区域蠕变斜坡地质灾害的类别、变形特征和空间发育规律:(1)断裂沿线主要发育了蠕变滑坡、蠕变泥石流物源和冰碛物流动3种类型蠕变斜坡地质灾害;(2)蠕滑滑坡具有"错乱的等高线状台阶",凸凹不平的主滑方向地形剖面,舌状地貌,无基岩裸露滑床等特征;(3)鲜水河断裂北段古滑坡、历史地震滑坡和震裂斜坡发育,与断裂带直接相交的,大部分存在蠕滑变形,未相交的往往无蠕滑变形,体现了活动断裂对地质灾害发育的控制作用;(4)发育"土石林型"和"坡面松散堆积物型"两种泥石流,识别特征是物源区有分散的缓慢变形体,流域范围内变形体的数量和速率是重要标志;(5)鲜水河断裂带附近4200m高程以上区域广泛存在现代冰碛物沿冰川槽谷滑动变形,其分布范围广、单体规模大、运动速率高,是现今研究区最主要的地表剥蚀形式之一。研究结果也表明,InSAR技术结合地质条件能有效地识别蠕变斜坡地质灾害,适于山区地质灾害众多、调查不便的工作环境,是地质灾害调查技术未来重要发展方向。
[Abstract]:Near the fault zone is often the multiple area of the creep slope geological hazard, and the small deformation is an important symbol indicating the geological hazard of the creep slope. In this paper, the active fault zone of the fresh water river in the Qinghai Tibet Plateau is taken as the study area, and the multi phase ALOS/PALSAR synthetic aperture radar data are selected for the time series interference (InSAR) observation, and the surface deformation of the millimeter level is obtained. On the basis of field investigation, remote sensing interpretation and comprehensive analysis of geological conditions, the categories, deformation characteristics and spatial development laws of the creep slope geological disasters in this region are revealed. (1) the main development of the creep landslide along the fracture, the creep debris flow and the moraine logistics of the 3 types of creep slope geological hazards; (2) the creep landslide has the "disorder" The contour profile of the contour line, the uneven main slip direction profile, the tongue shaped landform and no bedrock and slippery bed; (3) the ancient landslides in the northern segment of the fresh water river fault, the historical earthquake landslides and the fractured slopes are developed, and the fracture zones are directly intersected with the fracture zones, most of them have creep deformation, and the unintersected often have no creep deformation. The control effect of disaster development; (4) the development of two kinds of debris flows of "soil and stone forest" and "sloping loose accumulation", which are characterized by dispersed slow deformable bodies in the source area, and the number and rate of the deformable bodies within the basin range are important signs; (5) there are widespread moraine along the glacier trough over the area of the fresh water river fault zone near the 4200m elevation. Sliding deformation is one of the most important forms of surface erosion in the present study area. It is one of the most important forms of surface erosion in the present study area. The results of the study also show that InSAR technology can effectively identify the geological hazards of creep slope with geological conditions. It is suitable for many geological disasters in mountain areas, and the inconvenient working environment is an investigation technique for geological disasters. The important direction of future development.
【作者单位】：国土资源部新构造运动与地质灾害重点实验室中国地质科学院地质力学研究所;
【基金】：中国地质调查局工作项目(编号:DD20179282、DD20160272) 院所长基金项目(编号:DZLXJK201611) 自然科学基金项目(编号:41672359)资助的成果
【分类号】：P694

【相似文献】