摘要
由于自然改造的持续,地貌形态复杂,判断发育过程中的冲积扇是否经历过构造作用,一直是活动构造研究中的难点之一。近年来发展起来的无人机航空摄影测量技术在构造地貌数据采集方面有着突出的优势。文中结合野外调查和探槽等相关工作,利用无人机航空摄影测量技术对新疆巴里坤盆地南缘断裂上一处复杂的冲积扇面进行了高精度的DEM和DOM数据采集。针对正在发育的复杂冲积扇面,在对DEM进行地形解析和图像处理的基础上,采取了对扇面进行次级分区、逐个研究、相互佐证的方法,通过在次级分区内建立剖面集进行单独分析和邻近分区对比分析,明确了冲积扇面发育过程中经历的构造作用和2.5m的垂直变形量,显示该技术方法是识别复杂冲积扇残存构造信息并提取相关活动构造参数的有效手段。
Alluvial fans that are in the process of development always show complex geomorphic features due to natural modification. Accordingly,analyzing these fans whether to be influenced by tectonic deformation is one of the technique difficulties in active tectonic studies. Complex alluvial fans are the focus of the study of active tectonics such as fracture mapping and activity behavior analysis,for they have often retained important structural information. Traditional measurement methods,such as satellite remote sensing,RTK GPS and Lidar,are difficult to meet the demand for the study of micro tectonic deformation because of the reason of accuracy or cost performance. The recent UAV photogrammetry technology,due to its many advantages such as low cost,high resolution,and efficiency of exporting DEM and DOM data,has been widely used in three-dimensional modeling,ground mapping and other fields. In the quantitative study of active tectonics,this technology fills up the deficiency in the research of the micro structure of the traditional measurement. Through detailed field investigations and paleoseismic trenching,we further used this technology to obtain the topographic data of a complex alluvial fan located at the southern marginal fault of Barkol Basin,Xinjiang. Pointing at the alluvial fans that are in the process of development,and on the basis of topographic analysis and image processing for DEM,we take the research method of secondary partitions of the geomorphic surface and cut the alluvial fans longitudinally according to the difference of its age. Through the establishment of profile cluster within each partition,separate analysis and data contrast with the adjacent partitions,we acquired the tectonic activity information during the development of alluvial fan. The tectonic vertical deformation of this alluvial fan is about 2. 5m.
出处
《地震地质》
EI
CSCD
北大核心
2017年第4期793-804,共12页
Seismology and Geology
基金
财政部重点项目"全国地震重点监视防御区活动断层地震危险性评价"(1521044025)资助
关键词
无人机摄影测量技术
冲积扇地貌
巴里坤盆地南缘
构造活动信息
UAV photogrammetry technology
alluvial fan geomorphology
the southern margin of Barkol Basin
information of tectonic activity
