Landslide evolution law considering multiple dynamic environmental factors: a case study of nine landslide areas in Xining city

doi:10.13474/j.cnki.11-2246.2023.0130

Abstract

Abstract: In this paper, using 103-view Sentinel-1A data from 2018 to 2022, the SBAS-InSAR method was used to obtain information on slope-oriented subsidence in Xining city and to study the trend characteristics of slope-oriented subsidence in the landslide area of Xining city and its coupling relationship with factors such as vegetation cover and precipitation in the region. The results show that the sedimentation trend in the landslide area of Xining city shows the characteristics of slope divergence. Specifically, the degree of landslide sedimentation in the Yang slope area changes dramatically, and its sedimentation rate is faster than that of the Yin slope. According to this characteristic of subsidence change, this paper conducted a more profound study and characteristic mechanism:① The lower the vegetation cover, the higher the landslide deformation rate and the sunny slope is more prone to landslide than the shady slope. ② The amount of precipitation may lead to a short-term increase in the deformation variables of the characteristic points, but the overall situation is still decreasing. ③ The threat of features mainly comes from the sunny slope, and the higher slope area tends to be the place where the rate of landslide area is the largest. Therefore, the attention to landslides in Xining city should be more inclined to the southwest slope in the future to improve the alertness of landslide monitoring and warning in this region.

Key words: SBAS-InSAR, landslide, slope orientation, subsidence pattern, precipitation

CLC Number:

P237

HU Xiangxiang, KE Fuyang, ZHANG Zhishan, YAO Yongshun, SONG Bao, MING Lulu, YIN Jixin, ZHANG Haihuan. Landslide evolution law considering multiple dynamic environmental factors: a case study of nine landslide areas in Xining city[J]. Bulletin of Surveying and Mapping, 2023, 0(5): 21-26,43.

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