Citation: | WAN Jiawei, CHU Hongliang, LI Bin, GAO Yang, HE Kai, LI Zhuang, LI Yihao. Characteristics, types, main causes and development of high-position geohazard chains along the Jiali fault zone, Tibet, China[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(3): 51-60. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-07 |
High-position geohazard chains are widely distributed along the Jiali fault zone, Tibet, China. They often induced severe flood disasters in the river basins of the Yigong Zangbu, Palong Zangbu, and the downstream of Yalu Zangbu, such as the famous Yigong, Guxiang, Jianmupuqu, and Midui high-position geohazard chains. Based on the field investigations and previously published data, these high-position geohazard chains are classified into 4 types: 1) high-position landslide-debris flow-dammed lake-flood, 2) high-position landslide-dammed lake-flood, 3) high-position debris flow-dammed lake-flood, 4) glacial lake outburst flood. The formation conditions of the high-position geohazard chains are analyzed from 4 aspects, that is 1) geological structures and earthquakes, 2) landscape and river system, 3) glacier, 4) meteorology. In the end, the main causes and development trends of these geohazard chains are discussed. We believe that the high-position geohazard chains would be more frequent along the Jiali fault zone, with the global warming and the enhancement of the human engineering activities.
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Distribution of the large-scale and mega-scale geohazard chains along with the Jiali fault zone
Sketch of the geohazard chain of high-position rockslide, debris flow, dammed lake and flood
A general view of the Yigong landslide.
Deposits of the Yigong landslide. Photo was taken on Oct. 2020
Sketch of the geohazard chain ofhigh-position rockslide, dammed lake and flood
Deposits of the Ranwuhu landslide. Photo was taken on Aug. 2019
Sketch of the geohazard chain of high-position debris flow, dammed lake and flood
Oblique aerial view of the upstream of the Guxiang gully
Sketch of the glacier lake outburst flood
Satellite images of the Jinwengcuo glacier lake, obtained from the AIRI, CAS
Ms-T diagram of earthquakes (Ms≥4.5) in the study area and adjacent areas, 1945—2020
Annual average temperatures in Naqu, Linzhi, Bomi, Chayu
Annual precipitations in Naqu, Linzhi, Bomi, Chayu