Status: this preprint was under review for the journal NHESS but the revision was not accepted.
Exploring the potential relationship between the occurrence of landslides and debris flows: A new approach
Zhu Liang,Changming Wang,and Kaleem Ullah Jan Khan
Abstract. The aim of the present study is to explore the potential relationship between landslides and debris flows by establishing susceptibility zoning maps separately with the use of random forest. Longzi township, Longzi County, located in Southeastern Tibet, where historical landslide and debris flow are commonly occurred, was selected as the study area. The work has been carried out with the following steps: (1) A complete landslide and debris flow inventory map was prepared; (2) Slope units and 11 controlling factors were prepared for the susceptibility modelling of landslide while watershed units and 12 factors for debris flow; (3) Establishing susceptibility zoning maps for landslide and debris flow, respectively, with the use of random forest; (4) The performance of two models are verified using ROC curve, the values of AUC and contingency tables; (5) Putting the high or very-high-class watershed units in the debris flow susceptibility zone map as the base map to observe its coverage by slope units of different classes; (6) The landslide zoning map was put at the bottom floor and analyzed the distribution of high or very-high-class slope units in watershed units; (7) transforming the slope units into points and distributed them on the watershed units. Two models based on random forest have demonstrated great predictive capabilities, of which accuracy was close to 90% and the AUC value was close to 1. The loose sources carried out by the debris flows are not necessarily brought by the landslides although most landslides can be converted into debris flows. The area prone to debris flow does not promote the occurrence of landslides. A susceptibility zoning map composed of two or more natural disasters is comprehensive and significant in this regard.
How to cite. Liang, Z., Wang, C., and Ullah Jan Khan, K.: Exploring the potential relationship between the occurrence of landslides and debris flows: A new approach, Nat. Hazards Earth Syst. Sci. Discuss. [preprint], https://doi.org/10.5194/nhess-2020-127, 2020.
This article explored the potential relationship between two geological hazards (landslides and debris flows) in a new way.The superposition and combination of different forms of the susceptibility zoning map of the two disasters can clearly and concisely reflect the relationship between the two, which provided a basis for the further study of the disaster chain and a more valuable reference for the local government personnel.
This article explored the potential relationship between two geological hazards (landslides and...