雅鲁藏布江色东普沟崩滑-碎屑流过程模拟及运动特征分析

李昆仲; 张明哲; 邢爱国

doi:10.16031/j.cnki.issn.1003-8035.2021.01.03

雅鲁藏布江色东普沟崩滑-碎屑流过程模拟及运动特征分析

1.
西藏自治区地质环境监测总站，西藏拉萨　850001

2.
上海交通大学海洋工程国家重点实验室，上海　200240

基金项目: 国家重点研发计划课题(2018YFC1504804)；国家自然科学基金(41530639)

详细信息

作者简介: 李昆仲(1978-)，男，江苏东海县人，硕士，高级工程师，主要从事地质灾害研究。E-mail：910949179@qq.com

通讯作者: 张明哲(1997-)，男，山东泰安人，博士研究生，主要从事高速远程滑坡灾害研究。E-mail：mingzhezhang@sjtu.edu.cn

中图分类号: P642.21

收稿日期: 2020-09-18

修回日期: 2020-09-25

刊出日期: 2021-02-25

Numerical runout modeling and dynamic analysis of the ice avalanche-debris flow in Sedongpu Basin along Yarlung Zangbo River in Tibet

1.
Geological Environmental Monitoring Station of Tibet Autonomous Region, Lhasa, Tibet　850001, China

2.
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai　200240, China

More Information

Corresponding author: ZHANG Mingzhe, mingzhezhang@sjtu.edu.cn

Received Date: 18 September 2020

Revised Date: 25 September 2020

Publish Date: 25 February 2021

摘要

摘要:
2018年10月17日，西藏自治区雅鲁藏布江西岸色东普沟发生冰崩岩崩，冲刷侵蚀下部冰积堆积体和沟床松散堆积物，形成碎屑流冲入雅鲁藏布江，堆积后形成堰塞坝堵塞河道，严重影响当地居民安全和社会经济发展。本文基于真实遥感影像建立三维数值模型，利用DAN^3D分析其动力学特征，选取Frictional-Voellmy复合模型反演得到碎屑流堆积特征、滑体运动速度和铲刮深度等动力特征参数，与实际勘察结果基本一致，具有较好的可靠性。在野外勘察基础上，结合高密度电阻率法揭示了色东普沟崩滑-碎屑流堆积特征，结果表明DAN^3D能够较好地模拟滑体的堆积形态和最大厚度，验证了DAN^3D模拟的有效性，研究结论及方法对于此类灾害的机理研究及未来防治工程提供了新的研究思路。
- 色东普流域 /
- 冰崩 /
- 碎屑流 /
- DAN^3D /
- 高密度电阻率法
Abstract:
On October 17, 2018, a massive ice avalanche-debris flow occurred in the Sedongpu Basin on the left bank of the Yarlung Zangbo River in Tibet. The sliding mass scoured the glacial deposits and loose deposits in the gully bed and then transformed into a debris flow. Eventually, a barrier dam was formed and blocked the Yarlung Zangbo River, which seriously affected the safety of residents and social and economic development. In this paper, a three-dimensional numerical simulation of this event was performed based on remote sensing. A dynamic analysis (DAN^3D) model was utilized to analyze the dynamic characteristics of sliding mass, and the Frictional-Voellmy composite model was selected to reproduce debris flow accumulation characteristics, movement speed, and scraping depth. The simulation results are consistent with the actual survey results and have good reliability. Based on field investigation, the electrical resistivity tomography method was used to reveal the post-event accumulation characteristics of the ice avalanche-debris flow in Sedongpu gully. The results showed that DAN^3D could well simulate the accumulation shape and maximum thickness of sliding mass, which verified the effectiveness of DAN^3D simulation. The results of the study can help forecast similar events and provide new research ideas for the mechanism research of such disasters for future prevention and control projects.
- Sedongpu Basin /
- iceavalanche /
- debris flow /
- DAN^3D /
- electrical resistivity tomography method

HTML全文

图 1 色东普沟崩滑-碎屑流地理位置

Figure 1.

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图 2 色东普流域气温、降水变化曲线

Figure 2.

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图 3 色东普沟主沟剖面图

Figure 3.

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图 4 色东普沟崩滑-碎屑流数字高程模型

Figure 4.

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图 5 崩滑-碎屑流过程不同时刻滑坡堆积形态

Figure 5.

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图 6 崩滑-碎屑流铲刮分布

Figure 6.

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图 7 崩滑-碎屑流最大速度分布图

Figure 7.

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图 8 崩滑-碎屑流物探测线分布

Figure 8.

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图 9 横向测线(ERT4-ERT7)物探成果图

Figure 9.

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图 11-1

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图 10 纵向测线(ERT1-ERT3)物探成果图

Figure 10.

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图 11 物探解译和DAN^3D模拟堆积物厚度对比

Figure 11.

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表 1 流变模型和计算参数

Table 1. Rheological model and simulation parameters

	模型	容重/ (kN·m⁻³)	摩擦角/ (°)	摩擦系数	湍流系数/ m	内摩擦角/ (°)	最大铲刮深度/m
崩滑区	Frictional	25	28	−	−	36	0
流通区	Voellmy	21	−	0.04	1200	24	35
堆积区	Voellmy	21	−	0.05	1000	24	17

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表 2 物探解译与DAN^3D模拟堆积物最大深度对比（单位: m）

Table 2. Comparison of the maximum deposition depth between the ERT method and DAN^3D simulation (Unit: m)

	ERT1	ERT2	ERT3	ERT4	ERT5	ERT6	ERT7
物探解译	29	40	19	12	15	20	18
DAN^3D模拟	30	25	20	15	15	10	10

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