西藏易贡大滑坡成因探讨

基金项目:

国家自然科学基金项目《地理信息系统支持下的暴雨滑坡灾害动态风险评价》 49971066

Discussion on the Occurrence of Yigong Landslide in Tibet

1.
Institute of Remote Sensing Application, Chinese Academy of Sciences, Beijing 100101, China
2.
China Aero-Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
3.
LREIS, Institute of Geographic Science and Resource Research, Chinese Academy of Sciences, Beijing 100101, China

摘要: 2000年4月9日, 西藏林芝地区波密县易贡藏布札木弄沟发生了体积超过3×10⁸ m³的特大规模滑坡, 这是该沟100年(1900—2000年)来发生的第2次大规模滑坡.在卫星遥感影像分析基础上, 结合地质、气象、地震等资料, 对札木弄沟100年内2次发生特大规模滑坡的原因进行了分析, 表明这2次滑坡是地质构造、地层岩性、新构造运动、水文和气象因素共同作用的结果.分析结果还显示, 札木弄沟已进入下一个物质与能量积累过程, 在适当的外部条件作用下, 有可能再次发生滑坡.
- 易贡大滑坡 /
- 成因 /
- 预报
Abstract: In April 9, 2000, the huge landslide occurred in Yigong River in pomi in Tibet, the volume of the landslide was over 3×10⁸ m³. It was the second landslide occurred in the same gully during the last 100 years. Based on the analysis of satellite remote sensing images and data of stratum, structure, earthquakes and meteorology, the reasons for the occurrence of landslides were discussed. It has been shown that occurrence of the landslide were controlled by the combination of geological structure, stratum character, neo-tectonism and meteorological conditions. The gully is now in the condition of material and energy accumulation, landslide will probably occur in future.
- Yigong landslide /
- reason for landslide /
- prediction

图 1 易贡滑坡位置示意

Fig. 1. Location of Yigong landslide

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图 2 札木弄沟三维图像

Fig. 2. 3-D image of Zhamunong Gully

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图 3 札木弄沟地形纵剖面

Fig. 3. Terrain straight-cut section of Zhamunong Gully

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图 4 研究区附近的线性构造影像

Fig. 4. Linear structure image of study area

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图 5 研究区及其周围地区2000年1~3月地震震中分布

Fig. 5. Distribution of earthquakes occurred in study area and around area from Jan. 2000 to Mar. 2000

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图 6 易贡滑坡后的卫星影像(2000-05-04)

Fig. 6. Satellite image of Zhamuneng Gulley after landslide

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图 7 1990—1999年波密地区年降雨量

Fig. 7. Curve of rainfalls of Bomi from 1990 to 2000

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图 8 2000年3月和4月气温曲线(波密气象站)

Fig. 8. Curve of temperature (Bomi, Mar. to Apr., 2000)

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