Changes of surface recovery at coseismic landslides and their driving factors in the Wenchuan earthquake-affected area

Abstract. The activities of debris flow (DF) in the Wenchuan earthquake-affected area significantly increased after the earthquake on 12 May 2008. The safety of the lives and property of local people is threatened by DFs. A physics-based early warning system (EWS) for DF forecasting was developed and applied in this earthquake area. This paper introduces an application of the system in the Wenchuan earthquake-affected area and analyzes the prediction results via a comparison to the DF events triggered by the strong rainfall events reported by the local government. The prediction accuracy and efficiency was first compared with a contribution-factor-based system currently used by the weather bureau of Sichuan province. The storm on 17 August 2012 was used as a case study for this comparison. The comparison shows that the false negative rate and false positive rate of the new system is, respectively, 19 and 21 % lower than the system based on the contribution factors. Consequently, the prediction accuracy is obviously higher than the system based on the contribution factors with a higher operational efficiency. On the invitation of the weather bureau of Sichuan province, the authors upgraded their prediction system of DF by using this new system before the monsoon of Wenchuan earthquake-affected area in 2013. Two prediction cases on 9 July 2013 and 10 July 2014 were chosen to further demonstrate that the new EWS has high stability, efficiency, and prediction accuracy.

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Intensity–duration threshold of rainfall-triggered debris flows in the Wenchuan Earthquake affected area, China

Geomorphology ◽

10.1016/j.geomorph.2015.10.009 ◽

2016 ◽

Vol 253 ◽

pp. 208-216 ◽

Cited By ~ 43

Author(s):

Xiaojun Guo ◽

Peng Cui ◽

Yong Li ◽

Li Ma ◽

Yonggang Ge ◽

...

Keyword(s):

Wenchuan Earthquake ◽

Debris Flows ◽

Affected Area ◽

The Wenchuan Earthquake ◽

Duration Threshold

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Spatiotemporal change of vegetation coverage recovery and its driving factors in the Wenchuan earthquake-hit areas

Journal of Mountain Science ◽

10.1007/s11629-021-6879-z ◽

2021 ◽

Vol 18 (11) ◽

pp. 2854-2869

Author(s):

Xiao-fei Sun ◽

Lin-guo Yuan ◽

Ying-zhi Zhou ◽

Huai-yong Shao ◽

Xian-feng Li ◽

...

Keyword(s):

Wenchuan Earthquake ◽

Driving Factors ◽

Vegetation Coverage ◽

Spatiotemporal Change ◽

The Wenchuan Earthquake

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Application and analysis of debris-flow early warning system in Wenchuan earthquake-affected area

Natural Hazards and Earth System Sciences Discussions ◽

10.5194/nhessd-3-5847-2015 ◽

2015 ◽

Vol 3 (9) ◽

pp. 5847-5889 ◽

Cited By ~ 1

Author(s):

D. L. Liu ◽

S. J. Zhang ◽

H. J. Yang ◽

Y. H. Jiang ◽

X. P. Leng

Keyword(s):

Debris Flow ◽

Wenchuan Earthquake ◽

Early Warning ◽

Early Warning System ◽

Prediction Accuracy ◽

Warning System ◽

Affected Area ◽

The Wenchuan Earthquake ◽

Prediction Rate ◽

New System

Abstract. The activities of debris flow (DF) in the Wenchuan earthquake-affected area significantly increased after the earthquake on 12 May 2008. The safety of local people's lives and property has been and will continue to be threatened by DFs in a long term. To this end a physics-based early warning system (EWS) for DF forecasting was developed and applied in this earthquake area. This paper introduces an application of the system in the Wenchuan earthquake-affected area and analyzes the prediction results in comparison to the DF events triggered by the strong rainfall events reported by the local government. The prediction accuracy and efficiency was first compared with contribution-factors-based system currently adopted by the Weather Bureau of Sichuan Province using the storm on 17 August 2012 as a case study. The comparison shows that the failure prediction rate and false prediction rate of the new system is respectively 19 and 21 % lower than the system based on the contribution factors. Consequently, the prediction accuracy is obviously higher than the system based on the contribution factors with a higher operational efficiency. As invited by the Weather Bureau of Sichuan Province, authors have upgraded their prediction system of DF by using this new system before the monsoon of Wenchuan earthquake-affected area in 2013. Two prediction cases on 9 July of 2013 and 10 July of 2014 were chosen here to further demonstrate that the new EWS has a high stability, efficiency and prediction accuracy.

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Calculation of the Coseismic Landslide Volume Using DEMs: An Example from the Yingxiu Area, Wenchuan, Sichuan, China

Advances in Civil Engineering ◽

10.1155/2021/6646709 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Xiaoli Chen ◽

Yijian Chuan ◽

Yankun Wei

Keyword(s):

Wenchuan Earthquake ◽

Volume Calculation ◽

Affected Area ◽

Preliminary Stage ◽

Coseismic Landslides ◽

Landslide Volume ◽

Digital Elevation ◽

Elevation Changes ◽

Coseismic Landslide ◽

Broad Region

Volume calculation is important for quantifying the erosion driven by coseismic landslides in geomorphology. With the advent of digital elevation models (DEMs), quantifying features of landslide bodies have become possible, permitting to calculate the landslide volume in terms of elevation changes. To further test this approach, this work calculates the volume of landslides near the epicenter of the 2008 Mw 7.9 Wenchuan earthquake in the Yingxiu region, Sichuan, China, by comparing pre- and postearthquake DEMs. Results suggest that effective application of this method needs to consider the DEM resolution and eliminates background errors of individual landslides. The volume of coseismic landslides calculated by the proposed method may represent a minimum value compared to that from the existing empirical V-A formulas. Considering that it is difficult to quantify the coseismic landslide volume throughout in a broad region, this method can be applied to the preliminary stage of characterizing coseismic landslides quantitatively for some key localities of the affected area of major earthquakes.

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