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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-2020-294
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-294
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  08 Oct 2020

08 Oct 2020

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This preprint is currently under review for the journal NHESS.

Exploring the potential relationship between the occurrence of debris flow and landslide

Zhu Liang1, Changming Wang1, Donghe Ma2, and Kaleem Ullah Jan Khan1 Zhu Liang et al.
  • 1College of Construction Engineering, Jilin University, 130000 Changchun, People’s Republic of China;
  • 2ChinaWater Northeastern Investigation, Design and Research Co.Ltd.

Abstract. he aim of the present study is to explore the potential relationship between debris flow and soil slide by establishing susceptibility zoning maps (SZM) separately with the use of random forest. Longzi County, located in Southeastern Tibet, where historical landslides occurred commonly, was selected as the study area. The work has been carried out with the following steps: (1) An inventory map consisting of 448 landslides (399 soil slides and 49 debris flows) was determined; (2) Slope units and 11 conditioning factors were prepared for the susceptibility modelling of landslide while watershed units and 12 factors for debris flow; (3) SZM were constructed for landslide and debris flow, respectively, with the use of random forest; (4) The performance of two models were evaluated by 5-fold cross-validation using relative operating characteristic curve (ROC), area under the curve (AUC) and statistical measures; (5) The potential relationship between soil slide and debris flow was explored by the superimposition of two zoning maps; (6) Gini index was applied to determined the major factors and analyze the difference between debris flow and soil slide; (7) A combined susceptibility map with two kinds of disaster was obtained. Two models had demonstrated great predictive capabilities, of which accuracy and AUC was 87.33 %, 0.902 and 85.17 %, 0.892, respectively. The loose sources need by the debris flow were not necessarily brought by the landslides although most landslides can be converted into debris flow. The area prone to debris flow did not promote the occurrence of landslide. A susceptibility zoning map composed of two or more natural disasters is comprehensive and significant in this regard, which provides valuable reference for researches of disaster-chain and engineering applications.

Zhu Liang et al.

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Zhu Liang et al.

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Latest update: 26 Oct 2020
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Short summary
In previous study of landslide susceptibility mapping,one inventory is for one kind of landslide.However,it causes some troubles for prevention and management.This study aim to map two kinds of landslides meanwhile and put the results in the same map for exploring the potential relationship. Through superimposition of two zoning maps, it provides a new way to evaluate the disaster chain and further convenience for land-use planner.
In previous study of landslide susceptibility mapping,one inventory is for one kind of...
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