Spatial and Temporal Characteristics of Precipitation and Risk Level Division of Slope Landslide in Baomao Expressway Xiangxi Prefecture Section
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
Based on the precipitation data from meteorological stations along the Baomao Expressway in Xiangxi Prefecture from 2016 to 2023, this study conducts a comprehensive analysis of the temporal and spatial distribution characteristics of precipitation along the expressway, including annual and monthly characteristics, various levels of precipitation characteristics, short-term heavy precipitation characteristics, continuous precipitation characteristics, and diurnal variation characteristics. By integrating precipitation data, geographic information data, and road data, an evaluation index system for the risk level of slope failures along the expressway is established from three aspects: precipitation factors, terrain environment factors, and road factors. The slope failure risk level zoning research of the Baomao Expressway in Xiangxi Prefecture is carried out using the Analytic Hierarchy Process (AHP) and the Natural Breakpoint Method. The results show that: (1) The annual average precipitation along the expressway shows a spatial distribution pattern of higher precipitation in the south and lower in the north. In 2020, precipitation is abundant, while in 2022 and 2023, precipitation is scarce. Precipitation mainly occurs from April to September, with an average monthly precipitation exceeding 140 mm, and the highest precipitation is in June, reaching 236 mm. (2) The average number of days with rainstorm and above precipitation at each station along the expressway is 4.5 days, with an average intensity of 77.7 mm/d. Short-term heavy precipitation shows significant differences in distribution, with the maximum being 80 mm/h and the minimum being 46 mm/h. The total frequency of continuous precipitation is the highest at GS56-2 (Longjingao) with 31 times, and the lowest at GS56-7 (Fenghuang) with less than one time per year. The peak precipitation occurs in the afternoon and after dusk, and the night rain feature is obvious. (3) The risk level of slope failures along the expressway is divided into four grades: high, relatively high, medium, and low. The overall risk shows a characteristic of being higher in the north than in the south. The high-risk and relatively high-risk areas of slope failures are distributed in sections such as Biancheng, Longjingao, Maliuchang, and Jixin. The low-risk areas are located near the Jishou Station and the Fenghuang Station. For high-risk and relatively high-risk areas, in terms of disaster prevention and mitigation, measures such as reinforcing the slope and taking drainage measures should be taken, and monitoring and early warning should be strengthened. The results of this study have certain guiding significance for the prevention of slope failure disasters along the Baomao Expressway in Xiangxi Prefecture.
Keywords:
Project Supported:
Clc Number:
You are thevisitors
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.