Debris flows in a weathered granitic massif:: Sierra de Gredos, Spain
Debris flows in a weathered granitic massif:: Sierra de Gredos, Spain
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DOI：
10.1016/s0341-8162(02)00094-2
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发表时间：
2003-02-20
期刊：
影响因子：
6.2
通讯作者：
Vigil, R
中科院分区：
文献类型：
--
作者：
Palacios, D;García, R;Vigil, R
格雷多斯山脉由海西期花岗岩组成，是风化地幔的母岩，除了在晚更新世被冰川侵蚀的地区外，风化地幔遍布整个山脉。最近的泥石流形成于风化层覆盖的陡坡上，造成了相当大的破坏。本文分析了地幔结构和化学成分对泥石流形成和演化的影响。结果表明，风化地幔，尽管其初始状态，在某些地区是非常厚的，泥石流总是起源于这里形成的头陡坎和渠道，漏斗的斜坡洗。这一行动导致冲沟，迅速破坏泥石流沉积物和渠道。泥石流对格雷多斯山脉排水系统的发展具有影响力，研究表明，发生在其他风化花岗岩山脉的泥石流可能具有类似的影响。(C)2002 Elsevier Science B.V.保留所有权利。
Sierra de Gredos is composed of Hercynian granitic rock, the parent material for a weathering mantle, which extends throughout the range except in the areas that were eroded by glaciers during the late Pleistocene. Recent debris flows have formed on the steep slopes covered by the weathering mantle, causing considerable destruction. This study analyzes the impact of the mantle's structure and chemical composition on the formation and evolution of debris flows. The results show that the weathering mantle, despite its incipient state, is very thick in certain areas and that debris flows always originate here forming head scarps and channels that funnel the slope wash. This action leads to gullying, which quickly destroys the debris flow deposits and channels. Debris flows are influential in developing the drainage system in Sierra de Gredos, and the research suggests that debris flows occurring in other weathered granitic mountain ranges may have a similar impact. (C) 2002 Elsevier Science B.V. All rights reserved.