干旱区地理2025，Vol.48Issue(4)：632-639,8.DOI:10.12118/j.issn.1000-6060.2024.382
青海东部降雨型滑坡灾害特征及其致灾雨量分析
Characteristics of rainfall-type landslide disasters in eastern Qinghai and analysis of their causing rainfalls
摘要
Abstract
Rainfall-type landslides are the most frequent and impactful geological hazards in Qinghai Province,China;however,studies on the specific rainfall characteristics that trigger these landslides remain limited.This paper analyzes 339 rainfall-type landslides that occurred between 2016 and 2023 by examining precipitation con-ditions on the day of occurrence and 1-10 days prior.The objective is to identify the disaster characteristics of rainfall-type landslides and their triggering precipitation conditions.The study reveals the following:(1)Rainfall-type landslides are more frequent in the east than in the west,with Xining City and Haidong City accounting for 76.1%of occurrences.The highest incidence is observed in Xining City's Huangzhong District,Minhe County,and Ledu District.(2)Landslide frequency correlates with rainfall distribution—years with higher rainfall tend to experience more landslides,with August being the peak month for occurrences.(3)Light to moderate rainfall serves as the foundational condition for landslides,while heavy rainfall or greater acts as the triggering factor.When the cumulative rainfall of 10 days exceeds 40 mm,the probability of landslide occurrence increases signifi-cantly.(4)Rainfall-type landslides exhibit a certain lag effect relative to rainfall.The probability of occurrence is highest on the day following two consecutive days of heavy rainfall or greater,as well as on the third day after rainfall ends.In addition,landslide probability increases again approximately five days after rainfall ceases.The findings of this study provide a scientific basis for understanding the occurrence mechanisms of rainfall-type land-slides and developing forecasting and early warning models.关键词
降雨型滑坡/致灾雨量/前期有效雨量/青海东部Key words
rainfall-type landslides/disaster-causing rainfall/pre-effective rainfall/eastern Qinghai引用本文复制引用
赵国蓉,李万志,刘冰,祁门紫仪..青海东部降雨型滑坡灾害特征及其致灾雨量分析[J].干旱区地理,2025,48(4):632-639,8.基金项目
青海省重点研发与转化计划(2023-SF-109) （2023-SF-109）
第二次青藏高原综合科学考察研究(2019QZKK0906) （2019QZKK0906）
青海省气象局重点项目(QXZD2023-02)资助 （QXZD2023-02）
