安全与环境工程2025，Vol.32Issue(3)：243-253,11.DOI:10.13578/j.cnki.issn.1671-1556.20240253
强震区滑坡-泥石流灾害链成灾特征、机制与演化过程
Characteristics,mechanisms and evolution of landslide-debris flow geohazard chain under strong earthquake area
摘要
Abstract
Strong earthquakes often lead to the development of adverse geologic hazards such as collapses,landslides,debris flows,etc.Between the catastrophe units,a chain of geohazards is simple to build,complicating the mechanism of geohazard generation.Taking Shaofang Gully as the research object,we study the characteristics,mechanism,and evolution process of the landslide-debris flow geohazard chain through field investigation and modeling calculation.This study reveals that the Shaofang Gully exhibits a cascade effect,spatial and temporal expansiveness,time lag influence and difficult prediction within the landslide-debris flow geohazard chain.The mechanics of geohazard can trace their origins to the Wenchuan 8.0 magnitude earthquake,which triggers a cumulative slope surface displacement of 18.36 cm—surpassing the critical sliding threshold of the Longmen Mountain earthquake zone.This displacement results in landslides,and the accumulations squeeze the channel to form a dam.Under the action of debris flow impact,erosion and rainfall infiltration,dam break forms flood-induced debris flow.The evolutionary sequence of this geohazard chain unfolds across six different stages:pre-earthquake incubation,slope destabilization induced by seismic activity,the downward progression of landslides leading to channel obstruction and dam formation,dam-triggered outbursts culminating in flood-associated debris flows,recurring instances of unstable sliding,and the iterative occurrence of debris flows and landslides.In summary,the geohazard chain observed in the Shaofang Gully region is emblematic of complexity,with its formation predominantly steered by the interplay of potent earthquakes and rainfall dynamics.Under the influence of precipitation,debris flows and landslides are continuously generated in the Shaofang Gully,causing debris flows,debris flows,outburst flood-related debris flows,and landslides to repeatedly appear throughout the basin.关键词
烧房沟/泥石流/灾害链/地震作用/成灾机制/演化过程Key words
Shaofang Gully/debris flow/geohazard chain/earthquake effect/geohazard mechanism/evolution process分类
资源环境引用本文复制引用
夏湘朕,胡桂胜..强震区滑坡-泥石流灾害链成灾特征、机制与演化过程[J].安全与环境工程,2025,32(3):243-253,11.基金项目
国家自然科学基金项目(41861134008) （41861134008）
中国科学院青年创新促进会项目(2020367) （2020367）
