Evolution and Susceptibility Evaluation of Landslide Activity Intensity in Meizoseismal Area

Chen Ming; Cai Yinghua; Wang Xiaodi; Yang Tao; Gan Wei

doi:10.13961/j.cnki.stbctb.2019.01.038

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Evolution and Susceptibility Evaluation of Landslide Activity Intensity in Meizoseismal Area

- Evolution and Susceptibility Evaluation of Landslide Activity Intensity in Meizoseismal Area
- Bulletin of Soiland Water Conservation Vol. 39, Issue 1, Pages: 239-243(2019)
- 作者机构：
  
  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,成都,610059
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.01.038
  CLC：
- Published：2019
- 稿件说明：
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Chen Ming, Cai Yinghua, Wang Xiaodi, et al. Evolution and Susceptibility Evaluation of Landslide Activity Intensity in Meizoseismal Area[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 239-243.
DOI：

Chen Ming, Cai Yinghua, Wang Xiaodi, et al. Evolution and Susceptibility Evaluation of Landslide Activity Intensity in Meizoseismal Area[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 239-243. DOI： 10.13961/j.cnki.stbctb.2019.01.038.

摘要

[目的]探讨汶川地震强震区滑坡的活动强度演变与敏感性，为滑坡、泥石流等地质灾害风险管理提供依据。[方法]选取四川省都江堰市龙池镇龙溪河12条泥石流流域为研究区，通过对研究区震后4期遥感影像的滑坡解译分析，研究震后滑坡的活动演化特征；同时利用概率综合判别法-层次分析法对滑坡物源进行多期敏感性评价。[结果]地震后该区域产生了825个强震滑坡；2009-2017年，在强震滑坡区域外新增376个滑坡，至2017年，仍活动的滑坡数量减少到368个，占滑坡总数的30.6%，同时利用曲线下面积（AUC）检验多期敏感性评价结果，准确率为75.6%~81.4%，评价效果较好。[结论]强震区震后活动滑坡数量及高敏感性区域面积整体表现降低趋势，表明震后滑坡处于逐步恢复过程，强震区的地质灾害活动但活动强度仍远远高于震前。

Abstract

[Objective] To explore the evolution and susceptibility of landslide activity intensity in meizoseismal area of Wenchuan earthquake in order to provide important practical basis for landslide and debris flow risk management. [Methods] Twelve debris flow basins were selected as study area along Longxi River in Longchi Town

Dujiangyan City

Sichuan Province. Based on the interpretation analysis of the remote sensing images after the earthquake

the evolution characteristics of the landslide after earthquake were studied. At the same time

the probability comprehensive discriminant analysis method and the analytic hierarchy process were used to analyze the susceptibility of landslide. [Results] The 825 co-seismic landslides occurred in the region after the earthquake

and the intensity of landslide activity reduced gradually. From 2009 to 2017

376 new landslides occurred outside of the co-seismic landslide areas. In February 2017

the number of active landslides reduced to 368

accounting for 30.6% of the total landslides. The area under curve (AUC) method was used to test the multi-period evaluation results

the accuracy was 75.6% to 81.4%

and the evaluation results were satisfactory. [Conclusion] The number of active landslides after earthquakes and the area of high sensitive zone in meizoseismal area show a decreasing trend

indicating that the landslides after earthquakes are in the process of gradual recovery

but the activity intensity of geological hazards is still far higher than that before the earthquake.

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references

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