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西藏笨多高位变形体遥感解译与危险性预测分析

卫童瑶 殷跃平 李滨 褚宏亮 高杨 王猛 赵超英 刘晓杰

卫童瑶, 殷跃平, 李滨, 褚宏亮, 高杨, 王猛, 赵超英, 刘晓杰. 2021: 西藏笨多高位变形体遥感解译与危险性预测分析. 中国地质灾害与防治学报, 32(3): 17-24. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-03
引用本文: 卫童瑶, 殷跃平, 李滨, 褚宏亮, 高杨, 王猛, 赵超英, 刘晓杰. 2021: 西藏笨多高位变形体遥感解译与危险性预测分析. 中国地质灾害与防治学报, 32(3): 17-24. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-03
Tongyao WEI, Yueping YIN, Bin LI, Hongliang CHU, Yang GAO, Meng WANG, Chaoying ZHAO, Xiaojie LIU. 2021: Remote sensing interpretation and risk prediction analysis of Benduo high deformation body in Tibet. The Chinese Journal of Geological Hazard and Control, 32(3): 17-24. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-03
Citation: Tongyao WEI, Yueping YIN, Bin LI, Hongliang CHU, Yang GAO, Meng WANG, Chaoying ZHAO, Xiaojie LIU. 2021: Remote sensing interpretation and risk prediction analysis of Benduo high deformation body in Tibet. The Chinese Journal of Geological Hazard and Control, 32(3): 17-24. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-03

西藏笨多高位变形体遥感解译与危险性预测分析

doi: 10.16031/j.cnki.issn.1003-8035.2021.03-03
基金项目: 中国地质调查局地质调查项目(DD20211540);西藏自治区自然资源厅项目(藏财采【2020】0546)
详细信息
    作者简介:

    卫童瑶(1997-),男,硕士,主要从事工程地质与地质灾害研究工作。E-mail:1138018902@qq.com

  • 中图分类号: P642.22

Remote sensing interpretation and risk prediction analysis of Benduo high deformation body in Tibet

  • 摘要: 以易贡藏布上游笨多高位变形体为例,结合野外地面调查、无人机综合摄影调查、光学遥感动态调查和数值模拟预判等方法,对笨多高位变形体的发育特征及其可能形成灾害链的危险性进行预测分析。研究结果认为:(1)笨多高位变形体位于断层内,岩体破碎、岩体结构面发育、强度较低。目前笨多高位变形体内强烈变形的小型崩塌体12处,裂隙64条。(2)根据InSAR解译结果发现笨多高位变形体共有两处变形区,其中BX1变形区域规模较大,且最大形变速率达到85 mm/a,一旦失稳下滑具有较高的堵江风险。(3)对变形体失稳后危险性预测分析可知,笨多高位变形体发生失稳后会堵塞易贡藏布,堆积体平均厚度为90 m,形成堰塞湖回水长度达25 km。坝体堵塞形成的回水区域对上游的忠玉村溃决后对下游村镇的威胁程度均较高。(4)根据堰塞体的风险特征,探讨了开挖泄洪洞排泄洪水的处理方案。
  • 图  1  笨多高位变形体遥感全貌图

    Figure  1.  The overall view of Benduo's high-position deformable body

    图  2  笨多高位变形体现场照片

    Figure  2.  Photos of Benduo high-position deformed body

    图  3  笨多高位变形体工程地质剖面示意图

    Figure  3.  Profile of Benduo's high-position deformable body

    图  4  笨多高位变形体遥感解译分区图

    Figure  4.  The remote sensing interpretation map of Benduo high-position deformable body

    图  5  笨多崩塌崩源区控制性结构面

    Figure  5.  Controlling structural plane in the source area of the Benduo collapse

    图  6  笨多高位变形体2014年11月至2020年5月雷达视线向年均地表形变速率

    Figure  6.  The average annual surface deformation rate of the Benduo high-level landslide from November 2014 to May 2020 in the direction of the radar line of sight

    图  7  笨多高位滑坡2014年11月至2020年5月雷达视线事件序列地表形变

    Figure  7.  Ground deformation of the Benduo high-level landslide from November 2014 to May 2020 in the radar line of sight event sequence

    图  8  运动过程堆积厚度等值线图

    Figure  8.  Contour map of accumulated thickness during movement

    图  9  笨多高位变形体发生堵江溃决洪水流量过程线

    Figure  9.  The flood flow process line of Benduo high-level landslide blocking the river and breaking the river

    图  10  笨多高位地质灾害泄洪洞应急措施示意图

    Figure  10.  Schematic diagram of emergency measures for the flood discharge tunnel of Benduo high-level geological disaster

    表  1  笨多崩塌光学遥感数据一览表

    Table  1.   Summary of optical remote sensing data of Benduo collapse

    序号日期数据来源分辨率
    12006-04-30Google地球2.0 m
    2天地图影像2.0 m
    32020-10-24无人机航空正射影像0.2 m
    42020-10-24无人机航空倾斜影像0.2 m
    下载: 导出CSV

    表  2  控制性结构面产状统计表

    Table  2.   Occurrence statistics of controlled structural planes /(°)

    编号走向倾向倾角
    结构面1115~175205~26545~52
    结构面2172~211282~30140~45
    结构面3120~14530~5572~86
    结构面4285~313195~22358~71
    结构面5190~210100~12071~81
    下载: 导出CSV

    表  3  模拟结果统计表

    Table  3.   Statistics of simulation results

    名称模拟时间/s最大速度/(m·s−1最大流量/(m2·s−1铲刮深度/m
    数值2509311001.5
    坝体
    横宽/m
    坝体平面
    面积/km2
    坝体最大
    高度/m
    坝体平均
    高度/m
    2300.2111590
    下载: 导出CSV

    表  4  笨多高位变形体堵江溃决模型参数

    Table  4.   Model parameters of Benduo high-level landslide blocking the river and breaking the river

    模型参数坝前河面
    平均宽度/m
    坝前上游
    水深/ m
    堰塞湖最大
    库容量/m3
    取值450909000000000
    洪峰流量时的
    溃口宽度/m
    坝后下游水深/m坝前上游补给
    流量/(m3·s−1)
    1005600
    下载: 导出CSV

    表  5  易贡藏布各月份平均流量

    Table  5.   Average monthly flow of Yigong Zangbo

    月份123456
    平均流速/(m3·s−168.955.159.791.8266.3775.9
    月份789101112
    平均流速/(m3·s−11180918.2670.3284.6133.187.2
    下载: 导出CSV

    表  6  单孔泄洪洞计算结果(方案一)

    Table  6.   Calculation results of single-hole spillway tunnel (Scheme 1)

    水位高程/m高度/m宽度/m最大泄流量/(m3·s−1洪峰流量/(m3·s−1
    3130102012182735
    31408151258.34439
    31508121287.59161
    31608101265.215058
    下载: 导出CSV

    表  7  双孔泄洪洞计算结果(方案二)

    Table  7.   Calculation results of double-hole spillway tunnel (Scheme 2)

    水位高程/m高度/m宽度/m最大泄流量/(m3·s−1洪峰流量/(m3·s−1
    31308121234.52735
    314061013004439
    31506813149161
    31605.57124115058
    下载: 导出CSV
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  • 收稿日期:  2021-05-08
  • 修回日期:  2021-05-25
  • 刊出日期:  2021-06-25

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