Kinematic and morphological inventories of slope movement in Northern Norway

We developed simplified ground velocity products based on Interferometric Synthetic Aperture Radar (InSAR) to inventory slope movements in a ca 7500 km2 region in Northern Norway. We used a multiple temporal baseline InSAR stacking procedure based on 2015–2019 ascending and descending snow-free Sentinel-1 images to take advantage of a large set of interferograms and exploit different detection capabilities. Moving areas were identified, classified according to six velocity brackets, and morphologically associated to six landform types (rock glaciers, rockslides, glaciers/moraines, talus/scree deposits, solifluction/cryoturbation and composite landforms). We updated the pre-existing inventories of rock glaciers and rockslides in the region using InSAR kinematics. Landform delineations and divisions were refined, and newly detected landforms (54 rock glaciers and 20 rockslides) incorporated into the databases. The updated inventories consist of 414 rock glacier units within 340 single- or multi-unit(s) systems and 117 rockslides. Based on InSAR, a kinematic attribute assigned to each inventoried landform documents the magnitude order of the movement.

我们基于合成孔径雷达干涉测量（Interferometric Synthetic Aperture Radar，以下简称InSAR）开发了简化地表速度产品，用于对挪威北部约7500平方千米区域内的斜坡运动开展编目工作。本次研究采用基于2015至2019年升轨、降轨无雪Sentinel-1影像的多时间基线InSAR叠加处理流程，以充分利用大量干涉图并发挥不同的探测优势。研究人员识别出运动区域，按6个速度区间进行分类，并结合地貌形态特征将其对应至6类地貌类型：岩质冰川（rock glaciers）、岩崩（rockslides）、冰川/冰碛物、倒石堆/碎石坡堆积物、泥流/冻融扰动以及复合地貌。我们利用InSAR运动学方法更新了该区域原有的岩质冰川与岩崩编目成果，对地貌的划定与划分进行了优化，并将新探测到的54处岩质冰川和20处岩崩纳入数据库。更新后的编目包含340个单单元或多单元系统内的414个岩质冰川单元，以及117处岩崩。基于InSAR数据，我们为每一处已编录的地貌赋予运动学属性，以此记录其运动的量级范围。