High mobility of the channelized ancient Linka rock avalanche within the Bangong - Nujiang suture zone, SE Tibetan Plateau
High mobility of the channelized ancient Linka rock avalanche within the Bangong - Nujiang suture zone, SE Tibetan Plateau
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青藏高原东南部班公-怒江缝合带内渠道化古林卡岩崩的高流动性
DOI：
10.1016/j.enggeo.2021.105999
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发表时间：
2021-03
影响因子：
7.4
通讯作者：
Bo Yuan
中科院分区：
文献类型：
--
作者：
Qingli Zeng;Jiewang Zhu;Liye Liao;Rongqiang Wei;Fengshan Ma;Xuping Ma;Bo Yuan
大型岩石雪崩通常会造成生命损失，并对远离其初始失效位置的基础设施造成灾难性破坏，这主要是由于其巨大的体积、高速度和长跳动。对岩崩堆积物的表面形态和内部结构的研究可以揭示其运动和沉积机制的证据。临卡岩雪崩源体积约310 Mm3，起源于高陡陡坡，后转化为河道化岩雪崩，具有较高的可迁动性，超高程反算最大速度为42 m/s，移动距离约6200 m， Fahrboschung为0.24。该边坡破坏序列由外部灰岩板的初始破坏和内部砂岩板的第二次破坏组成。石灰岩雪崩有2到3次涌浪，而砂岩雪崩可能只有一次涌浪。临卡岩雪崩的高迁移率主要是由于高起伏源发生屈曲破坏、河道化过程中能量耗散低、基底相岩石破碎强烈以及沿瓦曲河双向传播时可能存在的水润滑作用。我们对林卡岩石雪崩的研究结果支持了先前的认识，即在长跳动岩石雪崩的不同阶段，多种机制有不同的作用。
Large rock avalanches often result in loss of life and catastrophic damage to infrastructure far from their initial failure positions, predominantly due to their tremendous volumes, high velocities and long runouts. Studies of the surface morphologies and internal structures of rock avalanche deposits can reveal evidence of their movement and deposition mechanisms. Through field survey, satellite image interpretation and particle-size distribution analysis, we studied the ancient, long-runout Linka rock avalanche, which is next to the Nujiang River, southeast Tibetan Plateau. The Linka rock avalanche, with a source volume of ~310 Mm3 originated from a high, steep dip slope and then transformed into a channelized rock avalanche, showing high mobility with a superelevation back-calculated maximal velocity of 42 m/s, a travel distance of ~6200 m and a Fahrboschung of 0.24. The slope failure sequence consisted of an initial failure of an outer limestone slab and a second failure of an inner sandstone slab. The limestone avalanche had 2 or 3 surges, while the sandstone avalanche probably had only one surge. The high mobility of the Linka rock avalanche predominantly resulted from a buckling failure occurred on a high relief source, low-energy dissipation during the channelized flow, intensive rock fragmentation in the basal facies and possible water lubrication when propagating bi-directionally along the Waqu River. Our findings for the Linka rock avalanche support previous knowledge that multiple mechanisms have different roles at different stages in a long runout rock avalanche.
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影响因子：
3.6
作者：
Xian-qin Hu;D. Cruden
通讯作者：
Xian-qin Hu;D. Cruden
DOI：
--
发表时间：
1994-01
期刊：
--
影响因子：
--
作者：
A. Strom
通讯作者：
A. Strom
影响因子：
7.4
作者：
Ming Zhang;Yue-ping Yin;M. McSaveney
通讯作者：
Ming Zhang;Yue-ping Yin;M. McSaveney
DOI：
10.1201/9780203946282.ch1
发表时间：
2007-05
期刊：
--
影响因子：
--
作者：
Tamotsu Takahashi
通讯作者：
Tamotsu Takahashi
影响因子：
5.2
作者：
De Blasio, Fabio Vittorio;Crosta, Giovanni Battista
通讯作者：
Crosta, Giovanni Battista