Qualitative hazard and risk assessment of landslides: a practical framework for a case study in China
Qualitative hazard and risk assessment of landslides: a practical framework for a case study in China
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DOI：
10.1007/s11069-011-0008-1
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发表时间：
2013-12
期刊：
影响因子：
3.7
通讯作者：
H. Wang;S. R. Wu;J. Shi;B. Li
中科院分区：
文献类型：
--
作者：
H. Wang;S. R. Wu;J. Shi;B. Li
滑坡的类型多种多样，由于我国地质条件的限制，有些滑坡是我国特有的，甚至与国外完全不同。陕西省宝鸡市是一个受强降雨直接触发和人类活动间接影响的黄土坡体运动强烈的地区。本文提供了一个框架，开发一个基于地理信息系统的程序，定性评估滑坡风险在中等比例尺1：10000。在影响研究区滑坡的环境因素中，河流侵蚀对古滑坡和古滑坡的发生有重要贡献，而降雨和人类活动则是近期滑坡发生的触发因素。采用边坡单元对滑坡失稳敏感性进行了定性评价，并结合滑坡类型和敏感性对区域尺度的灾害进行了分析。从滑坡敏感性分析，近75%的斜坡被归类为高敏感性，其中5个斜坡最近重新激活。据指出，只有6个旧的滑坡被归类为高级别的危险，在降雨的情况下，通过评估相结合的易感性与类型的滑坡。最后，在GIS环境下，通过灾害图和后果图对滑坡进行了自动定性分析。
Landslides are presented in various types; some of which are unique or completely different from those in other countries due to geological conditions in China. Baoji City in Shaanxi Province, as a study area, is intensely affected by loess slope movements, triggered by directly intensive rainfall and indirectly by human activities. This paper provides a framework for the development of a Geographical Information System-based procedure to qualitatively assess landslide risk at a medium scale of 1: 10,000. For environmental factors affecting landsliding in the study area, erosion of river made great contribution to the occurrence of paleo-slides and old slides, while rainfall and human activities were triggers for the presence of recent landslides. The qualitative susceptibility assessment was studied in terms of slope instability using slope units, and regional-scale hazards were then analyzed by incorporating the type of landslides with susceptibility. From the landslide susceptibility analysis, almost 75% of slopes were classified as high susceptibility, in which five slopes were recently reactivated. It was noted that only 6 old landslides were categorized into high levels of hazard in case of rainfall, after assessment by combining susceptibility with types of landslides. Finally, landslide risk analysis was qualitatively made in an automatic way within the GIS, crossing the hazard map and the map of consequences to property.