Abstract
Due to the special condition of provenance and disaster environment after “5·12” Earthquake, the probability and conditions of the occurrence of gully debris flow change greatly after the event, which make it difficult to prevent disaster effectively. In this study the hydrological model of ground water table in loose sediment is established. According to infinite slope theory, the safety factor of deposits is defined as the ratio of resistance force to driving force. The starting condition of post-earthquake gully debris flow is clearly studied by analyzing the effects of rainfall intensity, seismic strength, slope gradient and mechanical properties on the balance of accumulation body. Then the formulas of rainfall and aftershock threshold for starting of gully debris flow are proposed, and an example is given to illustrate the effect of rainfall, aftershocks and their coupling action on a debris flow. The result shows the critical rainfall intensity decreases as the lateral seismic acceleration and channel gradient increases, while the critical intensity linearly increases as the friction angle increases.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Caine N(1980) The rainfall intensity-during control of shallow landslides and debris flows. Geografiska Annaler 62: 23–27.
Casadei M, Dietrich WE, Miller NL(2003) Testing a model for predicting the timing and location of shallow landslide initiation in soil-mantled landscapes. Earth Surface Processes and Landforms 28: 925–950.
Chang KT, Chiang SH (2009) An integrated model for predicting rainfall-induced landslides. Geomorphology 105: 366–373.
Chen CY, Chen TC, Yu FC, et al (2005) Rainfall duration and debris-flow initiated studies for real-time monitoring. Environmental Geology 47: 715–724.
Iverson RM (2000) Landslide triggering by rain infiltration. Water Resources Research 36: 1897–191.
Lin CW, Liu SH, Lee SY, et al (2006) Impacts of the Chi-Chi earthquake on subsequent rainfall induced landslides in central Taiwan. Engineer Geology 86: 87–101.
Matthias J, Hamish W (2003) A hydroclimatic threshold for landslide initiation on the North Shore Mountains of Vancouver, British Columbia. Geomorphology 54: 137–15.
Montgomery DR, Dietrich WE (1994) A physically based model for topographic control on shallow landsliding. Water Resources Research 30: 1153–1171.
Tang C, Liang JT (2009a) Characteristics of debris flows in beichuan epicenter of the wenchuan earthquake triggered by rainstorm on september 24, 2008. Journal of Engineering Geology 16(6): 751–758. (In Chinese)
Tang C, Tie YB (2009b) Reconnaissance and analysis on the rainstorm induced debris flow in Weijiagou Valley of Beichuan City after the Wenchuan earthquake. Journal of Mountain Research 27(5): 625–630. (In Chinese)
Wilkinson PL, Anderson MG, Lloyd DM, et al (2002) Landslide hazard and bioengineering: towards providing improved decision support through integrated numerical model development. Environmental Modeling and Software 17: 333–34.
Xie H, Zhong DL, Jiao Z, et al (2009) Debris flow in Wenchuan quake-hit area in 2008. Journal of Mountain Research 27(4): 501–509. (In Chinese)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
He, S., Li, D., Wu, Y. et al. Study on the rainfall and aftershock threshold for debris flow of post-earthquake. J. Mt. Sci. 8, 750–756 (2011). https://doi.org/10.1007/s11629-011-2046-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11629-011-2046-2