Interannual surface evolution of an Antarctic blue-ice moraine using multi-temporal DEMs
Interannual surface evolution of an Antarctic blue-ice moraine using multi-temporal DEMs
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DOI：
10.5194/esurf-4-515-2016
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
M. Westoby;S. Dunning;J. Woodward;A. Hein;S. Marrero;Kate Winter;D. Sugden
中科院分区：
文献类型：
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作者：
M. Westoby;S. Dunning;J. Woodward;A. Hein;S. Marrero;Kate Winter;D. Sugden
抽象。多时相和高分辨率地形数据产品越来越多地用于量化冰川环境中的地表高程变化。在这项研究中，我们采用3-D数字高程模型（DEM）差分量化的地形演变的一个蓝色冰碛复杂的爱国者山，遗产范围，南极洲。地面激光扫描（TLS）被用来获取多个地形数据集的冰碛表面在2012/2013年的夏季开始和结束，并在2014年的一个重新调查的领域运动。一个补充的地形数据集是在第一季结束时通过应用结构从运动与多视图立体（SfM-MVS）摄影测量从无人驾驶航空器（UAV）获得的一组航拍照片。使用多尺度模型云比较（M3 C2）算法进行三维云-云差异。DEM差分显示净隆起和横向运动的冰碛峰在第1季（平均隆起~ 0.10米）和表面降低类似的幅度在一些冰碛间洼地和接近目前的冰缘，虽然我们无法验证后者。我们的研究结果表明，整个网站之间的季节1和2（平均0.07米）净隆起。这项研究表明，它是可能的检测动态表面地形变化跨越冰川冰碛在短时间尺度（年度内）通过收购和差分的高分辨率地形数据集。这些数据提供了新的机会，了解表面消融，冰流和冰碛冰内的碎片供应之间的过程联系。
Abstract. Multi-temporal and fine-resolution topographic data products are increasingly used to quantify surface elevation change in glacial environments. In this study, we employ 3-D digital elevation model (DEM) differencing to quantify the topographic evolution of a blue-ice moraine complex in front of Patriot Hills, Heritage Range, Antarctica. Terrestrial laser scanning (TLS) was used to acquire multiple topographic datasets of the moraine surface at the beginning and end of the austral summer season in 2012/2013 and during a resurvey field campaign in 2014. A complementary topographic dataset was acquired at the end of season 1 through the application of structure from motion with multi-view stereo (SfM-MVS) photogrammetry to a set of aerial photographs acquired from an unmanned aerial vehicle (UAV). Three-dimensional cloud-to-cloud differencing was undertaken using the Multiscale Model to Model Cloud Comparison (M3C2) algorithm. DEM differencing revealed net uplift and lateral movement of the moraine crests within season 1 (mean uplift ~ 0.10 m) and surface lowering of a similar magnitude in some inter-moraine depressions and close to the current ice margin, although we are unable to validate the latter. Our results indicate net uplift across the site between seasons 1 and 2 (mean 0.07 m). This research demonstrates that it is possible to detect dynamic surface topographical change across glacial moraines over short (annual to intra-annual) timescales through the acquisition and differencing of fine-resolution topographic datasets. Such data offer new opportunities to understand the process linkages between surface ablation, ice flow and debris supply within moraine ice.