帕隆藏布绞东滑坡堵江风险评估

周学铖; 徐争强; 胡祎; 张继宏

doi:10.16031/j.cnki.issn.1003-8035.2021.06-05

帕隆藏布绞东滑坡堵江风险评估

1.
四川省核工业地质调查院，四川成都　610052

2.
内蒙古第三地质矿产勘查开发有限责任公司，内蒙古呼和浩特　010011

基金项目: 林芝市巴宜区自然资源局项目（YDLZCG-1924）

详细信息

作者简介: 周学铖（1989-），男，工程师，主要从事遥感地质方面工作。E-mail: zhouxuecheng_rs@qq.com

通讯作者: 徐争强（1982-），男，高级工程师，主要从事遥感方面工作。E-mail: 84008181@qq.com

中图分类号: P642.22

收稿日期: 2021-03-02

修回日期: 2021-06-21

刊出日期: 2021-12-25

Risk assessment of blocking the river by Jiaodong landslide in Parlung Zangbo

1.
Sichuan Institute of Nuclear Geology, Chengdu, Sichuan　610052, China

2.
Inner Mongolia Third Geological and Mineral Exploration and Development Co. Ltd., Hohhot, Inner Mongolia　010011, China

More Information

Corresponding author: XU Zhengqiang, 84008181@qq.com

Received Date: 02 March 2021

Revised Date: 21 June 2021

Publish Date: 25 December 2021

摘要

摘要:
文章以绞东滑坡为例，利用多期光学影像和Sentinel-1A降轨数据对绞东滑坡的崩滑时间和历史活动性进行了分析，根据分析结果将绞东滑坡斜坡区划分为三个区域，其中两个已滑滑区（A区、C区）和一个潜在滑区（B区）。在此基础上，通过滑坡碎屑流和岩体势能之间的计算方程反演了已滑滑坡的体积规模和滑体平均厚度，并基于已滑滑坡对潜在滑区可能造成的灾情进行了预测，认为潜在滑区在全部滑坡的情况下存在堵江风险。文中研究认为，在遥感手段识别滑坡活动性的基础上，利用遥感影像、DEM等数据，通过计算滑坡碎屑流和岩体势能之间的关系，可进行实测数据难以获取区域的滑坡规模与滑体平均厚度估算，进而进行险情评估，为滑坡防治提供指导。
- 绞东滑坡 /
- 遥感 /
- InSAR /
- 滑坡-碎屑流 /
- 堵江风险
Abstract:
Taking Jiaodong landslide as an example, this paper analyzes the collapse time and historical activity of Jiaodong landslide by using multi-phase optical images and sentinel-1A orbit reduction data. According to the analysis results, the slope area of Jiaodong landslide is divided into three areas, including two already sliding areas (area A and area C) and one potential sliding area (area B). On this basis, through the calculation equation between landslide debris flow and potential energy of rock mass, the volume scale and average thickness of the sliding mass of the sliding landslide are inversed. Based on the prediction of the possible disaster caused by the sliding landslide to the potential sliding area, it is considered that the potential sliding area has the risk of blocking the river under the condition of full unloading. This study believes that on the basis of remote sensing means to identify landslide activity, using remote sensing images, DEM and other data, through calculating the relationship between landslide debris flow and potential energy of rock mass, we can estimate the landslide scale and average thickness of the area where the measured data are difficult to obtain, and then carry out risk assessmentduj to provide guidance for landslide prevention and control.
- Jiaodong landslide /
- remote sensing /
- InSAR /
- landslide debris flow /
- river blocking risk

HTML全文

图 1 绞东滑坡区位示意图

Figure 1.

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图 2 绞东滑坡斜坡区三维影像图

Figure 2.

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图 3 绞东滑坡三处斜坡区平均形变时序曲线图

Figure 3.

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图 4 绞东滑坡形变速率图（2019 年 10 月 3 日至 2020 年 7 月 29 日，LOS 方向）

Figure 4.

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图 5 绞东滑坡潜在滑区（B）地形剖面示意图

Figure 5.

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表 1 高位滑坡体体积计算模型检验计算表

Table 1. Check calculation table of high-level landslide volume calculation model

参数	L /m	B /m	H /m	d /m	α /(°)	μ	V_计算 /m³	V_现场估算 /m³	接近率 /%
北侧滑体	728	15	515	1.5	40	0.71	16143	15000	92.92
南侧滑体	579	218	428	1.5	35	0.74	544436	500000	91.84

下载: 导出CSV

表 2 高位滑坡体平均厚度计算表

Table 2. Calculation table of average thickness of high-level landslide mass

滑坡体	V_现场估算/m³	S_投影面积/m²	S_表面积/m²	h_平均/m
北侧滑体	15000	16359	19971	0.75
南侧滑体	500000	65199	79593	6.28

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表 3 滑坡堵河最小坝高快速评估表

Table 3. Quick evaluation table for minimum dam height of landslide blocking river

河谷底宽 W/m	河谷坡度 α/（°）	不同松散堆积体体积V_单位宽度下的坝体高度/m
河谷底宽 W/m	河谷坡度 α/（°）	2000 m³	4000 m³	6000 m³	8000 m³
40	30	18.71	31.93	40.33	47.36
	35	22.28	33.43	44.79	52.52
	40	23.26	34.53	48.73	55.73
80	30	14.37	26.86	33.41	41.71
	35	14.67	28.33	35.84	45.68
	40	15.04	31.71	38.07	49.17
120	30	11.26	18.05	28.06	36.23
	35	11.39	19.51	32.76	37.38
	40	11.97	21.61	34.00	39.19

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