Development of a rapid active layer detachment slide in the Fenghuoshan Mountains, Qinghai–Tibet Plateau

IF 3 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Permafrost and Periglacial Processes Pub Date : 2022-06-14 DOI:10.1002/ppp.2151

G. Jiang, Siru Gao, A. Lewkowicz, Hongting Zhao, Shou-ji Pang, Qingbai Wu

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引用次数: 2

Abstract

An active layer detachment slide (ALDS) in the interior portion of the Qinghai–Tibet Plateau (QTP) was investigated within 2 days of its formation on September 21, 2018. The ALDS developed on a relatively gentle slope (4.8° to 9°) at an elevation of 4,850 m above sea level (asl) and was about 145 m long and 45 m wide, with a headscarp 2.2–2.5 m high. Analyses of meteorological data and soil temperatures indicated that it was probably triggered by a record thaw depth which intersected a layer with high ice content at the base of the active layer and in the top of the permafrost. Based on the time window, the minimum downslope velocity of the main slide mass was about 20 m/h which is higher than previously reported values. The ALDS ran into the embankment of the Qinghai–Tibet Railway (QTR) but did not damage the railbed. However, extensive rehabilitation of the slope was needed subsequent to the failure to clear the slide mass and as minor headscarp recession and thaw settlement continued on the slope. In this work, we describe this feature and the most likely mechanisms of development.

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青藏高原峰火山快速活动层滑脱滑动发育

2018年9月21日，青藏高原内部的一个活动层剥离滑动体（ALDS）在形成后2天内进行了研究。ALDS在海拔4850的相对平缓的斜坡（4.8°至9°）上发育海拔约145米 m长，45 米宽，头鱼高2.2–2.5米。对气象数据和土壤温度的分析表明，这可能是由创纪录的融化深度引发的，该深度与活动层底部和永久冻土顶部的高含冰层相交。根据时间窗口，主滑坡体的最小下坡速度约为20 m/h，其高于先前报告的值。ALDS撞上了青藏铁路（QTR）的路堤，但没有损坏道床。然而，在未能清除滑坡体之后，以及由于斜坡上的轻微头枕后退和解冻沉降仍在继续，需要对斜坡进行广泛的修复。在这项工作中，我们描述了这一特征和最可能的发展机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Permafrost and Periglacial Processes 地学-地质学

CiteScore

9.70

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Permafrost and Periglacial Processes is an international journal dedicated to the rapid publication of scientific and technical papers concerned with earth surface cryogenic processes, landforms and sediments present in a variety of (Sub) Arctic, Antarctic and High Mountain environments. It provides an efficient vehicle of communication amongst those with an interest in the cold, non-glacial geosciences. The focus is on (1) original research based on geomorphological, hydrological, sedimentological, geotechnical and engineering aspects of these areas and (2) original research carried out upon relict features where the objective has been to reconstruct the nature of the processes and/or palaeoenvironments which gave rise to these features, as opposed to purely stratigraphical considerations. The journal also publishes short communications, reviews, discussions and book reviews. The high scientific standard, interdisciplinary character and worldwide representation of PPP are maintained by regional editorial support and a rigorous refereeing system.