A discussion of the relationship between landslide disaster and rainfall types in Bazhong of Sichuan

This article mainly describes the relationship between landslide disaster and rainfall types in the Bazhong district to provide reference for the critical rainfall threshold and early warning service for landslide disasters in this region. The Bazhong area is located in the transition zone between the Sichuan Basin and the Qinling orogenic belt, where the stratum is mainly composed of red bed with interbedded sandstone-shale. By corresponding to heavy rainfall events and landslide, this paper preliminarily reveals the characteristics of landslide disaster triggered by rainfall characteristics. In addition, based on the analysis of rainfall intensity, combined with rainfall duration and rainfall process, the historical rainfall is subdivided into 6 types: unimodal, pre-peak, post-peak, increasing, decreasing, and uniform types. This paper also gathers and analyzes the historical data and experimental results, which confirm that the rainfall process has a significant effect on the landslide occurrence. The research results show that the analysis of rainfall types can be strengthened during heavy rainfall, and they can provide technical support for early warning information of regional landslide disasters and early concession avoidance.