摘要
汶川8级地震造成当地极大的生命和财产损失,震后次生地质灾害又给灾区规划重建带来严重影响。本文分析了汶川震后滑坡、崩塌等地质灾害的时空分布特征,以流域为单元,选用改进后的震后泥石流总流量计算公式,以泥石流物源总量与沟床比降为评价因子,建立单沟泥石流危险性评价模型,对57条潜在泥石流沟进行了危险性评价。实地调查及相关资料验证表明,评价结果与实际较为吻合,具有较强实用性,可为汶川灾后重建规划与地质灾害防治提供技术支持。
The May 12, 2008 M8.0 earthquake in Wenchuan caused great loss of life and significant destruction of property, and caused a significant amount of discussion of post-disaster reconstruction and planning. This article presents an analysis of the timing and spatial distribution of landslides and collapses after the Wenchuan earthquake, and has established a single-valley hazard assessment model to assess the landslide and collapse risk for a total of 57 potential debris flow valleys using a watershed model in combination with improved post-earthquake debris flow modeling and evaluation factors derived from the diminishing amount of debris flow material with increasing distance from individual valleys. Field investigations and data validation indicate that our evaluation approach was robust and accurate, and can provide technical support for post- earthquake reconstruction planning and the future prevention of geological disasters.
出处
《上海国土资源》
2012年第3期57-60,100,共5页
Shanghai Land & Resources
关键词
泥石流
危险性评价
地震次生灾害
地质灾害防治
GIS
debris flow
hazard assessment
secondary disaster of earthquake
prevent and control of geological disaster
GIS
