地理科学 ›› 2015, Vol. 35 ›› Issue (1): 91-98.doi: 10.13249/j.cnki.sgs.2015.01.91

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基于地貌单元的小区域地质灾害易发性分区方法研究

唐川(), 马国超   

  1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059
  • 收稿日期:2014-03-27 修回日期:2014-07-20 出版日期:2015-01-15 发布日期:2015-01-15
  • 作者简介:

    作者简介:唐川(1961-),男,安徽合肥人,教授,博士生导师,主要从事地质灾害、环境地质遥感与GIS应用研究。E-mail: tangc@cdut.edu.cn

  • 基金资助:
    科技基础性工作专项项目(2011FY110100)、中国地质调查局项目(12120113009900)资助

Small Regional Geohazards Susceptibility Mapping Based on Geomorphic Unit

Chuan TANG(), Guo-chao MA   

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2014-03-27 Revised:2014-07-20 Online:2015-01-15 Published:2015-01-15

摘要:

以汶川县城周边区域为研究区,分别以栅格单元与地貌单元作为单位评价单元,以信息量法与逻辑回归法两种评价模型对研究区进行地质灾害易发性评价分区。根据对评价结果的比较分析,在小区域范围内,基于地貌单元的区域易发性分区不仅仅能够更好地体现出区域内局部综合特性,而且评价分区结果与地质灾害实际分布情况更加吻合,分级层次更加明显,数学模型的适用效率很好。由此可见,在小范围区域内,基于地貌单元的地质灾害易发性评价分区具有良好的适用性与可塑性,在大比例尺地质灾害易发性和危险性制图中是一个有益的尝试与启发。

关键词: 地质灾害, 信息量法, 逻辑回归, 地貌单元, 易发性分区

Abstract:

The assessment of geological disasters mainly includes susceptibility assessment, hazard assessment, vulnerability assessment and risk assessment. The first two just reflect the geological disasters’ nature characteristics and theirs’ dangerous levels, what’s more, the remaining additionally describe geological disasters’ social characteristics and social potential losses on the basis of the first two. Actually, the susceptibility and hazard assessment could trace back to the 1970s, meanwhile, with the rapid development of GIS technology and high precision geotechnical physical model after 1990s, the research about geological disasters’ dangerous levels also step into a rapid development stage. On the whole, susceptibility assessment of geological disasters statically reflect the probability of geological disasters’ occurrence in view of the basic geological environmental conditions (internal control factors). On the other way, hazard assessment of geological disasters additionally takes external factors (time probability etc.) into account and responds the probability of geological disasters’ occurrence. Thus it can be seen that susceptibility assessment is the most fundamental research work in hazard or risk assessment and directly describes geological disasters’ inoculation situation. Nowadays, with the popularization and deepening of regional geological disaster risk assessment and zoning work, in view of small area, especially for small mountainous area or small populated area, the susceptibility assessment to geological disasters becomes increasingly urgent and important. Based on the above situation, this article takes Wenchuan County surrounding area as the study object, taking grid unit and geomorphic unit as evaluation unit, using information value method and logistic regression method to take an analysis on the susceptibility zoning. According to the results of comparative analysis, in a small area, susceptibility zoning with geomorphic unit not only can better reflect the local comprehensive characters, make the evaluation results more close to the actual geological disasters distribution, but could get clear hierarchical level, and more effective for the application of the mathematical model. The conclusions is: in a small area, it will have a good applicability and plasticity for the susceptibility zoning which is based on the geomorphic unit and it is a beneficial attempt and inspiration for the geological disasters susceptibility mapping in the large scale.

Key words: geological disasters, information value method, logistic regression method, geomorphic unit, susceptibility zoning

中图分类号: 

  • P642