Surface and bed morphology of Hansbreen, a tidewater glacier in Spitsbergen
Surface and bed morphology of Hansbreen, a tidewater glacier in Spitsbergen
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斯匹次卑尔根群岛潮水冰川 Hansbreen 的表面和河床形态
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发表时间：
2012
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通讯作者：
T. Budzik
中科院分区：
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作者：
M. Grabiec;J. Jania;D. Puczko;Leszek Kolondra;T. Budzik
汉斯布林 (Hansbreen) 是斯匹次卑尔根岛南部（斯瓦尔巴群岛）的一座中等规模的潮水冰川，是北极研究最深入的冰川之一。这项工作基于 2005 年和 2008 年春季 GPS/GPR 活动期间收集的数据以及其他最近的地形/测深来源，提出了其表面和基础地形的新数字高程模型。冰川的平均厚度经计算为171 m，其体积估计为9.6 (±0.1) km 3 。基岩形态的主要特征是在海平面以下过深的巨大凹陷，从冰川前缘向上游延伸至11公里。该洼地被与该地区主要地质/构造特征相关的不同岩台划分为四个单独的盆地。基岩形态对冰川表面地形影响很大。讨论了基岩和地表地形对冰下排水系统几何形状的影响。冰川表面的巨大凹陷有利于融水的集中和冰臼系统的发展。关键词：北极、斯瓦尔巴群岛、冰川学、基岩地形。
Hansbreen, a medium size tidewater glacier in Southern Spitsbergen (Svalbard) is one of the most intensively studied glaciers in the Arctic. This work presents new digital elevation models of its surface and basal topography based on data collected during GPS/GPR campaigns conducted in the spring seasons of 2005 and 2008, as well as on other recent topographic/bathymetric sources. The mean thickness of the glacier is calculated as 171 m and its volume is estimated to be 9.6 (±0.1) km 3 . The main feature of the bedrock morphology is a vast depression that is overdeepened below sea level and extends as far as 11 km upstream from the glacier front. This depression is divided into four individual bas− ins by distinct sills that are related to the main geological/tectonic features of the area. The bedrock morphology affects considerably the glacier's surface topography. The influence of bedrock and surface relief on the subglacial drainage system geometry is discussed. Vast depressions on the glacier surface favor concentration of meltwater and development of moulin systems. Key wor ds: Arctic, Svalbard, glaciology, bedrock topography.