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Rainfall-triggering response patterns of post-seismic debris flows in the Wenchuan earthquake area

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Abstract

Several giant debris flows occurred in southwestern China after the Wenchuan earthquake, causing serious casualties and economic losses. Debris flows were frequently triggered after the earthquake. A relatively accurate prediction of these post-seismic debris flows can help to reduce the consequent damages. Existing debris flow prediction is almost based on the study of the relationship between post-earthquake debris flows and rainfall. The relationship between the occurrence of post-seismic debris flows and characteristic rainfall patterns was studied in this paper. Fourteen rainfall events related to debris flows that occurred in four watersheds in the Wenchuan earthquake area were collected. By analyzing the rainfall data, characteristics of rainfall events that triggered debris flows after the earthquake were obtained. Both the critical maximum rainfall intensity and average rainfall intensity increased with the time. To describe the critical conditions for debris flow initiation, intensity–duration curves were constructed, which shows how the threshold for triggering debris flows increased each year. The time that the critical rainfall intensities of debris flow occurrences return to the value prior to the earthquake could not be estimated due to the absent rainfall data before the earthquake. Rainfall-triggering response patterns could be distinguished for rainfall-induced debris flows. The critical rainfall patterns related to debris flows could be divided on the basis of antecedent rainfall duration and intensity into three categories: (1) a rapid triggering response pattern, (2) an intermediate triggering response pattern, and (3) a slow triggering response pattern. The triggering response patterns are closely related to the initiation mechanisms of post-earthquake debris flows. The main difference in initiation mechanisms and difference in triggering patterns by rainfall is regulated by the infiltration process and determined by a number of parameters, such as hydro-mechanical soil characteristics, the thickness of the soil, and the slope gradient. In case of a rapid triggering response rainfall pattern, the hydraulic conductivity and initial moisture content are the main impact factors. Runoff erosion and rapid loading of solid material is the dominant process. In case of a rainfall pattern with a slow triggering response, the thickness and strength of the soil, high hydraulic conductivity, and rainfall intensity are the impact factors. Probably slope failure is the most dominant process initiating debris flows. In case of an intermediate triggering response pattern, both debris flow initiation mechanisms (runoff erosion and slope failure) can play a role.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 41202253), the Special Program for the Fundamental Research of Science and Technology of the Ministry of Science and Technology, China (No. 2011FY110100-3) and Research Fund of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection of China (No. 2011Z020). Finally the authors wish to thank the anonymous reviewers for their helpful suggestions to improve the paper.

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Authors and Affiliations

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, People’s Republic of China

    Wei Zhou & Chuan Tang

  2. Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands

    Th. W. J. Van Asch

  3. Sichuan Provincial Meteorological Observatory, Chengdu, People’s Republic of China

    Chunhua Zhou

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  1. Wei Zhou
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  2. Chuan Tang
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  3. Th. W. J. Van Asch
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  4. Chunhua Zhou
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Correspondence to Wei Zhou.

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Zhou, W., Tang, C., Van Asch, T.W.J. et al. Rainfall-triggering response patterns of post-seismic debris flows in the Wenchuan earthquake area. Nat Hazards 70, 1417–1435 (2014). https://doi.org/10.1007/s11069-013-0883-8

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  • DOI: https://doi.org/10.1007/s11069-013-0883-8

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