Remote sensing interpretation of development characteristics of high-position geological hazards in Sedongpu gully, downstream of Yarlung Zangbo River
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摘要:
色东普沟位于雅鲁藏布江下游左岸、加拉白垒峰下方，受温度、降水和地震的因素影响，曾多次发生高位地质灾害并造成雅鲁藏布江堵塞。通过实地调查，结合Landsat等多源、多期遥感影像以及InSAR雷达数据，对色东普沟高位地质灾害发育特征进行分析，并对现存变形体进行解译和分析，得到以下结论：色东普沟发育多处冰川、崩塌、滑坡和冰湖灾害；色东普沟自2001年起20年间，发生高位地质灾害堵塞雅鲁藏布江干流事件共5次；沟内上部极高山区现存确定变形体3处和疑似变形体2处；针对发生于2018年的两次色东普高位地质灾害，认为其物源来自于一处高位岩崩区和三处高位冰崩区。研究结果为色东普高位地质灾害的进一步研究提供了初步数据，并为类似地质灾害的研究提供了有效的科学思路。
Abstract:Sedongpu gully is a branch gully on the left bank of the lower reaches of the Yarlung Zangbo River. It is located below the galabaire peak. It often accumulates abundant moraines and loose deposits every year. Affected by temperature, rainfall and earthquake, high-position geological disasters have occurred many times and caused the blockage of the Yarlung Zangbo River. Through field investigation, combined with Landsat and other multi-source and multi-phase remote sensing images and InSAR radar data, the development characteristics of high-position geological disasters in Sedongpu gully are analyzed, and the existing deformation bodies are interpreted and analyzed: There are many glaciers, collapses, landslides and ice lakes in sedongpu gully; In the past 20 years since 2001, there have been five high-position geological disasters blocking the mainstream of the Yarlung Zangbo River; There are 3 identified deformations and 2 suspected deformations in the upper part of the gully; According to the two high-position geological disasters occurred in 2018 in Sedongpu gully, it is considered that the provenance comes from one high-position rock avalanche area and three high-position ice avalanche areas. This paper provides preliminary data for the further study of high-position geological disasters in Sedongpu gully, and provides effective scientific ideas for the study of similar geological disasters.
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