Subglacial bedforms of the last British Ice Sheet
Subglacial bedforms of the last British Ice Sheet
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英国最后一个冰盖的冰下地床形态
DOI：
10.4113/jom.2010.1111
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发表时间：
2010
期刊：
影响因子：
2.2
通讯作者：
C. Jordan
中科院分区：
文献类型：
--
作者：
A. Hughes;C. Clark;C. Jordan
请点击这里下载与本文相关的地图。冰下底形是以前冰川地貌的一个特征。平行于冰流形成（如鼓形冰碛）或横向于冰流形成（肋状冰碛），它们保存下来的分布是冰盖形态的宝贵记录。到目前为止，这些地貌在英国没有得到充分利用，以至于我们只能看到最后一个英国冰盖的流动模式的简单静态视图，在少数几个地点记录了复杂性的一瞥。可以说，这是因为缺乏一个合适的，冰盖规模，冰下底形分布图。我们提出了第一个一致的和全国范围内的冰下底形图为英国系统制图。个别地貌绘制从浮雕阴影再现的高分辨率高程数据和陆地卫星TM图像。每个底形的轮廓线或波峰线都是通过人工采集的，直接数字化到地理信息系统（GIS）数据库中。查明了39 000多个地貌，揭示了新的线理格局、多个交叉/叠加的实例，并为当地实地调查确定的已知分布增加了更多细节。该地图是英国冰下底形人口的一个近乎完整的表示，它为重建冰盖规模的流动演变提供了适当的基础，并为解释沉积学和地层学数据提供了地貌框架，是朝着英国冰盖配置的详细模型迈出的重要一步。该地图的比例尺为1：525 000。
Abstract Please click here to download the map associated with this article. Subglacial bedforms are a characteristic feature of formerly glaciated landscapes. Formed parallel (e.g. drumlins) or transverse (ribbed moraine) to ice flow their preserved distribution is a valuable record of ice sheet configuration. To date these landforms have been underused in Britain such that we have only a simple static view of the flow patterns of the last British Ice Sheet, with glimpses of complexity recorded in just a few locations. Arguably, this is because of the lack of a suitable, ice-sheet scale, map of subglacial bedform distribution. We present the first consistent and countrywide map of subglacial bedforms for Britain produced from systematic mapping. Individual landforms were mapped from relief-shaded renditions of high-resolution elevation data and Landsat TM imagery. The outline or crest-line of each bedform was manually captured by onscreen digitisation directly into a Geographic Information System (GIS) database. Over 39,000 landforms were identified revealing new lineation patterns, multiple instances of cross-cutting/superimposition, and adding additional detail to the known distribution established by local field surveys. A near complete representation of the British subglacial bedform population, the map is a major step towards a detailed model of British Ice Sheet configuration by providing a suitable basis for reconstructing the flow evolution at the ice sheet scale, and a geomorphological framework for the interpretation of sedimentological and stratigraphical data. The map is presented at a scale of 1:525,000.
影响因子：
4
作者：
Clark, Chris D.;Hughes, Anna L. C.;Ng, Felix S. L.
通讯作者：
Ng, Felix S. L.