Triggering mechanisms and depositional rates of postglacial slope-movement processes in the Yosemite Valley, California
Triggering mechanisms and depositional rates of postglacial slope-movement processes in the Yosemite Valley, California
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加利福尼亚州约塞米蒂山谷冰后斜坡运动过程的触发机制和沉积速率
DOI：
10.1016/0169-555x(95)00112-i
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发表时间：
1996
期刊：
影响因子：
3.9
通讯作者：
Stefan Jäger
中科院分区：
文献类型：
--
作者：
G. Wieczorek;Stefan Jäger
我们研究了从395个斜坡运动事件的报告，在过去的150年中，在约塞米蒂国家公园，中央山脉内华达州，加州，以确定最普遍的类型的斜坡运动及其触发机制。岩石滑坡和罗克瀑布比泥石流、泥石流和各种滑塌要多得多。罗克瀑布产生了最大的累积量的存款。大约一半的斜坡移动有未报告或未被识别的触发事件。地震和暴雨分别占所有类型的历史斜坡运动的公认触发器的沉积物的最大累积量;融雪，人类活动和冻融条件只占报告的触发器的体积的一小部分。比较约塞米蒂山谷部分地区斜坡运动过程的历史和冰后期平均年沉积率表明，在1851-1992年期间，斜坡运动过程产生的沉积率约为过去15，000年平均沉积率的一半。
We examined information collected from 395 reports of slope-movement events during about the past 150 years in Yosemite National Park, central Sierra Nevada, California, to identify the most prevalent types of slope movements and their triggering mechanisms. Rock slides and rock falls have been more numerous than debris slides, debris flows, and miscellaneous slumps. Rock falls have produced the largest cumulative volume of deposits. About half of slope movements had unreported or unrecognized triggering events. Earthquakes and rain storms individually accounted for the greatest cumulative volumes of deposits from recognized triggers of all types of historical slope movements; snowmelt, human activities and freeze-thaw conditions accounted for only a small proportion of the volumes from reported triggers. A comparison of the historical and postglacial average annual rates of deposition from slope-movement processes in a portion of the Yosemite Valley indicates that, during the period 1851–1992, slope-movement processes have been producing about half the average rate of deposits than during the past 15,000 years.