Abstract
Enhanced debris flow activity observed after the 2008 Wenchuan earthquake, Sichuan Province, SW China, is still intense more than a decade since the earthquake. A heavy rainstorm on 20 August 2019 caused catastrophic debris flows in the epicentral area of the earthquake. By remote sensing imagery interpretation and field investigation, 13 debris flows were identified. An empirical rainfall threshold I-D model (intensity–duration) of post-seismic debris flows is established. Changing rainfall thresholds, characteristics, and initiation mechanisms of the 2019 debris flows were analyzed, which are different from the events that occurred in previous years. We find that the 2019 debris flows were mainly initiated by concentrated runoff erosion of sediments stored in tributary channels of catchments, with little contribution from the coseismic landslides and new hillslope failures. Differently, the major sediment supply of debris flows in previous years was mainly from the reactivation of coseismic landslide deposits. By analyzing the triggering rainfall of all recorded debris flows after the Wenchuan earthquake, we find that the rainfall threshold in 2019 is about 1/2–4/5 of the pre-earthquake value, and the I-D model we built can predict the 2019 debris flows successfully. Considering that there are still a large number of coseismic landslide deposits in the mountain catchments and the rainfall thresholds are slowly recovering, the post-seismic debris flows may last for a long period.
References
Caine N (1980) The rainfall intensity: dur control of shallow landslides and debris flows. Geografiska Annaler Ser A, Phys Geogr 62:23. https://doi.org/10.2307/520449
Campbell R, Bernknopf R and Soller D (2020) Mapping time-dependent changes in soil-slip-debris-flow probability.
Chang CW, Lin PS, Tsai CL (2011) Estimation of sediment volume of debris flow caused by extreme rainfall in Taiwan. Eng Geol 123:83–90
Chang M, Dou X, Fan X and Yao C (2018) Critical rainfall patterns for rainfall-induced debris flows in the Wenchuan earthquake area. Geoence.
Chen H, Hawkins AB (2009) Relationship between earthquake disturbance, tropical rainstorms and debris movement: an overview from taiwan. B Eng Geol Environ 68:161–186
Chen NS, Hu GS, Deng MF, Zhou W, Yang CL, Han D, Deng JH (2011) Impact of earthquake on debris flows — a case study on the Wenchuan earthquake. J Earthq Tsunami 5:493–508
Chen HX, Zhang LM, Zhang S (2014) Evolution of debris flow properties and physical interactions in debris-flow mixtures in the Wenchuan earthquake zone. Eng Geol 182:136–147
Cui P, Wei F, Chen X (2008) Geo-hazards in Wenchuan earthquake area and countermeasures for disaster reduction. Bulletin of Chinese Academy of Sciences
Dahlquist MP, West AJ (2019) Initiation and runout of post-seismic debris flows: insights from the 2015 gorkha earthquake. Geophys Res Lett 46:9658–9668
Domenech G, Fan XM, Scaringi G, van Asch TWJ, Xu Q, Huang RQ, Hales TC (2019) Modelling the role of material depletion, grain coarsening and revegetation in debris flow occurrences after the 2008 Wenchuan earthquake. Eng Geol 250:34–44
Fan RL, Zhang LM, Wang HJ, Fan XM (2018a) Evolution of debris flow activities in gaojiagou ravine during 2008-2016 after the Wenchuan earthquake. Eng Geol 235:1–10
Fan XM, Domenech G, Scaringi G, Huang RQ, Xu Q, Hales T, Dai LX, Yang Q, Francis O (2018b) Spatio-temporal evolution of mass wasting after the 2008 m-w 7.9 Wenchuan earthquake revealed by a detailed multi-temporal inventory. Landslides 15:2325–2341
Fan XM, Juang CH, Wasowski J, Huang RQ, Xu Q, Scaringi G, van Westen CJ, Havenith HB (2018c) What we have learned from the 2008 Wenchuan earthquake and its aftermath: a decade of research and challenges. Eng Geol 241:25–32
Fan X, Scaringi G, Domènech G, Yang F, Guo X, Dai L, He C, Xu Q, Huang R (2019a) Two multi-temporal datasets that track the enhanced landsliding after the 2008 Wenchuan earthquake. Earth Syst Sci Data 11:35–55. https://doi.org/10.5194/essd-11-35-2019
Fan X, Scaringi G, Korup O, West AJ, van Westen CJ, Tanyas H, Hovius N, Hales TC, Jibson RW, Allstadt KE, Zhang L, Evans SG, Xu C, Li G, Pei X, Xu Q, Huang R (2019b) Earthquake-induced chains of geologic hazards: patterns, mechanisms, and impacts. Rev Geophys 57:421–503. https://doi.org/10.1029/2018RG000626
Fan X, Yunus AP, Scaringi G, Catani F, Subramanian SS, Xu Q, Huang R (2021) Rapidly evolving controls of landslides after a strong earthquake and implications for hazard assessments. Geophysical Research Letters 48 e2020GL090509. https://doi.org/10.1029/2020GL090509
Floris M, D’Alpaos A, Squarzoni C, Genevois R, Marani M (2010) Recent changes in rainfall characteristics and their influence on thresholds for debris flow triggering in the dolomitic area of Cortina d’Ampezzo, north-eastern Italian alps. Nat Hazard Earth Syst 10
Ge YG, Song GH, Guo CX, Kong YD (2012) Characteristics and causes of 8·18 debris flow hazards at the Longmenshan town, Pengzhou, Sichuan. J Hydraul Eng 43:147–154
Guo X, Cui P, Li Y, Ma L, Ge Y, Mahoney WB (2016) Intensity–duration threshold of rainfall-triggered debris flows in the Wenchuan earthquake affected area, China. Geomorphology 253:208–216. https://doi.org/10.1016/j.geomorph.2015.10.009
Guzzetti F, Peruccacci S, Rossi M, Stark CP (2007) Rainfall thresholds for the initiation of landslides in central and Southern Europe. Meteorog Atmos Phys 98:239–267. https://doi.org/10.1007/s00703-007-0262-7
Hu W, Wang G, Scaringi G, McSaveney M, Hicher P-Y (2017) Shear resistance variations in experimentally sheared mudstone granules: a possible shear-thinning and thixotropic mechanism. Geophys Res Lett 44. https://doi.org/10.1002/2017GL075261
Hu W, Huang RQ, McSaveney M, Yao L, Xu Q, Feng MS, Zhang XH (2019) Superheated steam, hot CO2 and dynamic recrystallization from frictional heat jointly lubricated a giant landslide: field and experimental evidence. Earth Planet Sc Lett 510:85–93
Huang X (2012) Possibility analysis of typical debris flow blocking river in Wenchuan earthquake area. Chengdu University of Technology
Huang RQ, Fan XM (2013) The landslide story. Nat Geosci 6:325–326
Iverson RM (1997) The physics of debris flows. Rev Geophys 35:245–296
Jakob M, Hungr O (2007) Debris-flow hazards and related phenomena. Springer Praxis Books, p 42
Jiang Z, Fan X, Siva Subramanian S, Yang F, Tang R, Xu Q, Huang R (2021) Probabilistic rainfall thresholds for debris flows occurred after the wenchuan earthquake using a Bayesian technique. Eng Geol 280:105965. https://doi.org/10.1016/j.enggeo.2020.105965
Jibson RW (1989) Debris flows in southern Puerto Rico. Special Paper of the Geological Society of America, vol 236, pp 29–56
Kean JW, McCoy SW, Tucker GE, Staley DM, Coe JA (2013) Runoff-generated debris flows: observations and modeling of surge initiation, magnitude, and frequency. J Geophys Res-Earth 118:2190–2207
Li G, West AJ, Densmore AL, Jin ZD, Parker RN, Hilton RG (2014) Seismic mountain building: landslides associated with the 2008 Wenchuan earthquake in the context of a generalized model for earthquake volume balance. Geochem Geophys Geosyst 15:833–844
Lin C-W, Shieh C-L, Yuan B-D, Shieh Y-C, Liu S-H, Lee S-Y (2004) Impact of Chi-Chi earthquake on the occurrence of landslides and debris flows: example from the chenyulan river watershed, Nantou, Taiwan. Eng Geol 71:49–61. https://doi.org/10.1016/S0013-7952(03)00125-X
Ma C, Hu KH, Zou Q, Tian M (2013) Characteristics of clustering debris flows in Wenchuan earthquake zone. J Mt Sci 10:953–961
Ma C, Wang YJ, Hu KH, Du C, Yang WT (2017) Rainfall intensity-duration threshold and erosion competence of debris flows in four areas affected by the 2008 Wenchuan earthquake. Geomorphology 282:85–95
Massey CI, Townsend DT, Lukovic B, Morgenstern R and Vilder SD (2020) Landslides triggered by the mw7.8 14 November 2016 Kaikōura earthquake: an update. Landslides.
Ouimet WB (2010) Landslides associated with the May 12, 2008 Wenchuan earthquake: implications for the erosion and tectonic evolution of the Longmen Shan. Tectonophysics 491:244–252
Parker RN, Densmore AL, Rosser NJ, de Michele M, Li Y, Huang RQ, Whadcoat S, Petley DN (2011) Mass wasting triggered by the 2008 Wenchuan earthquake is greater than orogenic growth. Nat Geosci 4:449–452
Qu Y, Tang C, Liu Y, Wang J, Chang M (2015) Survey and analysis of the “8.13” debris flows fan in Longchi town of Dujiangyan City, Sichuan province. J Hydraul Eng 46:197-207–197-216
Saba SB, Meijde MVD, Werff HVD (2010) Spatiotemporal landslide detection for the 2005 Kashmir earthquake region. Geomorphology 124:17–25
Shafique M (2020) Spatial and temporal evolution of co-seismic landslides after the 2005 Kashmir earthquake. Geomorphology 362:107228. https://doi.org/10.1016/j.geomorph.2020.107228
Shen P, Zhang L, Wong HF, Peng D, Zhou S, Zhang S, Chen C (2020) Debris flow enlargement from entrainment: a case study for comparison of three entrainment models. Eng Geol 270:105581. https://doi.org/10.1016/j.enggeo.2020.105581
Shieh CL, Tsai YJ (2009) Variability in rainfall threshold for debris flow after the Chi-Chi earthquake in Central Taiwan, China. Int J Sedi Res 24:177–188
Shieh CL, Chen Y-S, Shieh ML, Tsai Y-J (2006) Rainfall criteria variation of debris flow occurring at Mt. Ninety-nine. Interpraevet, pp 167–175
Tan WP, Han QY (1992) Study on regional critical rainfall indices of debris flow in Sichuan province. J Catastropho 11:877–887
Tang C, Liang J (2008) Characteristics of debris flow in the epicenter of Beichuan earthquake Wenchuan earthquake caused by rainstorm on September 24, 2008. J Eng Geol 16:751–758
Tang C, van Asch TWJ, Chang M, Chen GQ, Zhao XH, Huang XC (2012) Catastrophic debris flows on 13 August 2010 in the qingping area, southwestern China: the combined effects of a strong earthquake and subsequent rainstorms. Geomorphology 139:559–576
Vapnik V, Kotz S (2006) Estimation of dependences based on empirical data: empirical inference science (information science and statistics). Springer-Verlag
Wang N (2015) Prediction and evaluation of debris flow scale in Wenchuan earthquake area. Chengdu University of Technology
Wang YS, Huang RQ, Luo YH, Xu HB (2011) The genetic mechanism of Wenchuan earthquake. J Mt Sci 8:336–344
Wieczorek GF (1987) Effect of rainfall intensity and duration on debris flows in central Santa Cruz Mountains, California. Rev Eng Geol 7:93–104
Wohl EE, Pearthree PP (1991) Debris flows as geomorphic agents in the Huachuca Mountains of southeastern Arizona. Geomorphology 4:273–292. https://doi.org/10.1016/0169-555X(91)90010-8
Xie H, Zhong DL, Jiao Z (2009) Debris flow in Wenchuan quake-hit area in 2008. J Mt Sci 27:501–509
Xiong J, Tang C, Chen M, Zhang X, Shi Q, Gong L (2021) Activity characteristics and enlightenment of the debris flow triggered by the rainstorm on 20 August 2019 in Wenchuan County, China. B Eng Geol Environ 80:873–888. https://doi.org/10.1007/s10064-020-01981-x
Xu Q (2010) The 13 August 2010 catastrophic debris flows in Sichuan province: characteristics, genetic mechanism and suggestions. J Eng Geol 18:596–608
Xu Q, Zhang S, Li WL, van Asch TWJ (2012) The 13 August 2010 catastrophic debris flows after the 2008 Wenchuan earthquake, China. Nat Hazard Earth Sys 12:201–216
Xu C, Xu XW, Yao X, Dai FC (2014) Three (nearly) complete inventories of landslides triggered by the may 12, 2008 Wenchuan mw 7.9 earthquake of China and their spatial distribution statistical analysis. Landslides 11:441–461
Xu C, Xu XW, Shen LL, Yao Q, Tan XB, Kang WJ, Ma SY, Wu XY, Cai JT, Gao MX, Li K (2016) Optimized volume models of earthquake-triggered landslides. Sci Rep-Uk 6:29797
Yang W, Qi W, Zhou J (2018) Effects of precipitation and topography on vegetation recovery at landslide sites after the 2008 Wenchuan earthquake. Land Degrad Dev 29:3355–3365
Yu B, Ma Y, Wu Y (2013) Case study of a giant debris flow in the Wenjia gully, Sichuan province, China. Nat Hazards 65:835–849
Yunus AP, Fan X, Tang X, Jie D, Xu Q, Huang R (2020) Decadal vegetation succession from modis reveals the spatio-temporal evolution of post-seismic landsliding after the 2008 Wenchuan earthquake. Remote Sens Environ 236:111476. https://doi.org/10.1016/j.rse.2019.111476
Zhang S, Zhang LM (2017) Impact of the 2008 Wenchuan earthquake in China on subsequent long-term debris flow activities in the epicentral area. Geomorphology 276:86–103
Zhang LM, Zhang S, Huang RQ (2014) Multi-hazard scenarios and consequences in Beichuan, China: the first five years after the 2008 Wenchuan earthquake. Eng Geol 180:4–20
Zhou W, Tang C, Zhou C (2012) Critical rainfall characteristics for rainfall-induced debris flows in Wenchuan earthquake affected areas. Adv Water Sci 23:650–655
Acknowledgements
This research is financially supported by the Funds for Creative Research Groups of China (grant no. 41521002), the National Science Fund for Outstanding Young Scholars of China (grant no. 41622206), the National Key R&D Program of China (no. 2017YFC1501002), and the Fund of SKLGP (SKLGP2019Z002).
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Yang, F., Fan, X., Siva Subramanian, S. et al. Catastrophic debris flows triggered by the 20 August 2019 rainfall, a decade since the Wenchuan earthquake, China. Landslides 18, 3197–3212 (2021). https://doi.org/10.1007/s10346-021-01713-6
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DOI: https://doi.org/10.1007/s10346-021-01713-6