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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/nhess-2020-131
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-131
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Sep 2020

01 Sep 2020

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This preprint is currently under review for the journal NHESS.

Landslides distribution at tributaries with different evolution stages in Jiangjia Gully, southwestern China

Xia Fei Tian1,2,3, Yong Li1,2, and Quan Yan Tian3,4 Xia Fei Tian et al.
  • 1Key Laboratory of Mountain Hazards and Surface Process, CAS, Chengdu, 610041, China
  • 2Institute of Mountain Hazards and Environment, CAS, Chengdu, 610041, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Cold and Arid Region of Environmental and Engineering Research Institute, CAS

Abstract. Landslide susceptibility assessment is of great significance for the disaster prediction and prevention. At present, most studies used statistical methods by the influence factors of landslide distribution, or based on physical models to determine the assessment result, the research of these methods was mainly focused on the gully scale. At the same time, these methods did not focus on the specific principle of material storage. In this paper, the surface erosion index, being the integral of the hypsometric curve, is adopted to explore the landslides distribution characteristic in different tributaries of the gully. Firstly, 81 tributaries of JJG are taken from DEM with 10 m grid cells, and the hypsometric curves are used to characterize their evolution stages; five stages are identified by the evolution index (EI, the integral of the hypsometric curves) and most tributaries are in relative youth stage with EI between 0.5 and 0.6. Then 906 landslides are interpreted from Quickbird satellite image of 0.61 m resolution. It is found that LD (LD = landslides number in a tributary/ the tributary area) increases exponentially with EI, while LAp (LAp = landslides area in a tributary/the tributary area) fluctuates with EI, meaning that landslides are inclined to occur in tributaries with EI between 0.5 and 0.6, and thus these tributaries are the main material sources supplying for debris flows.

Xia Fei Tian et al.

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Short summary
81 tributaries and 908 landslides are taken, this paper firstly reveals the spatial distribution of landslides. The relationship between hypsometric curve integral and landslides shows that the landslides number increases exponentially with hypsometric curve integral and the landslides area is concentrated in hypsometric curve integral between 0.5 and 0.6, it means that sufficient material for debris flows can be provided, which explains the reason that JJG has the debris flow of high frequency.
81 tributaries and 908 landslides are taken, this paper firstly reveals the spatial distribution...
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