Morphometry of glacial cirques in the Cantabrian Range (Northwest Spain)
Morphometry of glacial cirques in the Cantabrian Range (Northwest Spain)
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DOI：
10.1127/0372-8854/2009/0053-0047
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发表时间：
2009-03
影响因子：
2.2
通讯作者：
J. Ruiz‐Fernández;Miguel A. Poblete-Piedrabuena;M. P. Serrano-Muela;C. Martí‐bono;J. García‐Ruiz
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文献类型：
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作者：
J. Ruiz‐Fernández;Miguel A. Poblete-Piedrabuena;M. P. Serrano-Muela;C. Martí‐bono;J. García‐Ruiz
在西班牙北方坎塔布里亚山脉选择了两个研究区，以分析相对边缘冰川环境中更新世冰斗的形态特征。欧洲峰西部地块（WMPE）（最高海拔2,596米）的特点是阿尔卑斯山般的地形和主要由石灰岩露头主导的地质景观。西南阿斯图里亚斯山脉（SSWA）（最高海拔2,002米）是典型的古生代景观，类似阿巴拉契亚山脉，主要是古老的侵蚀面。统计分析发现，在WMPE的环境因素（海拔高度，方面和岩性）和冰斗形态之间的关系很少。因此，该地区冰斗的发育可能更多地受到构造过程（如差异侵蚀和断裂）和岩溶侵蚀的影响。与此相反，一个明显的增加，在冰斗的大小观察到的SSWA的海拔高度增加。在两个研究区中，冰斗主要分布在北向和北东向的区域，尤其是在海拔低于WMPE的SSWA。在SSWA，而不是WMPE，冰斗的水平尺寸往往比垂直尺寸更快地增加，支持异速生长模型的冰斗发展在这方面。
Two study areas were selected in the Cantabrian Range, in northern Spain, in order to analyse the morphometric characteristics of Pleistocene glacial cirques in a relatively mar- ginal glacial environment. The Western Massif of Picos de Europa (WMPE) (highest altitude at 2,596 m) is characterised by Alpine-like relief and a geological landscape mainly dominated by calcareous outcrops. The sierras of Southwest Asturias (SSWA) (highest altitude at 2,002 m) is a typical Palaeozoic landscape of Appalachian-like relief and is dominated by old erosion surfaces. A statistical analysis found few relationships between environmental factors (altitude, aspect and lithology) and cirque morphometry in the WMPE. Glacial cirque development in this area is therefore likely to be more influenced by structural processes (such as differential erosion and fractures) and karstic erosion. In contrast, a clear increase in cirque size is observed with increasing altitude in the SSWA. In both study areas, cirques are predominantly distrib- uted in areas with N and NE aspects, but particularly so in the SSWA which is of lower alti- tude than the WMPE. In the SSWA but not the WMPE, the horizontal dimensions of the cirques tend to increase more rapidly than the vertical dimensions, supporting the allometric model of glacial cirque development in this area.