Daily fine sediment dynamics on an active Alpine glacier outwash plain
Daily fine sediment dynamics on an active Alpine glacier outwash plain
复制标题
活跃的高山冰川冲积平原上的每日细沉积物动态
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
D. Milan
中科院分区：
文献类型：
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作者：
D. Hetherington;D. Milan
以往对河道形态变化的研究往往依赖于稀疏的时空数据集，往往无法量化由沙和细砾石组成的河道的小尺度变化。这项研究报告了使用高分辨率3D激光扫描仪(LMS Z210)评估瑞士费佩尔和蒙特矿山冰川前冰川带河流沉积物收支的情况。在融水季节早期，在4000平方米的辫状平原上获得的高分辨率(>；500点m-2)数据使得能够产生床面的数字高程模型(DEM)。减去连续的每日DEM，揭示了研究河段上游段的总体侵蚀模式，下游段发生沉积。该扫描仪能够量化发生在研究范围中央部分的撕脱和内侧杆侵蚀的主要发作。在河段的下游端也可以识别出瞬时叶和沉积层，以及叶前缘的进积。还可以检测到河道形态的相对较小的变化，如沙洲边缘的淤积、岸滩侵蚀和溜槽的发展。
Previous studies of channel morphological change have frequently relied upon sparse spatial and temporal data sets, often failing to quantify small-scale changes in channels composed of sand and fine gravel. This study reports the use of a high resolution 3D laser scanner (LMS Z210) in the assessment of fluvial sediment budgets in the proglacial zone of the Ferpecle and Mont Mine glaciers, Switzerland. High resolution (>500 points m -2 ) data obtained across 4000 m 2 of braid plain during the early part of the meltwater season permitted Digital Elevation Models (DEMs) of the bed surface to be produced. Subtraction of successive daily DEMs revealed an overall pattern of erosion in the upstream section of the study reach with deposition occurring in the downstream section. The scanner was able to quantify a major episode of avulsion and medial bar erosion that occurred within the central part of the study reach. Transient lobes and sediment sheets could also be identified at the downstream end of the reach, as could lobe front progradation. Relatively minor changes in channel morphology could also be detected such as bar edge accretion, bank erosion, and chute development.