Abstract
A new water–sediment separation structure with a herringbone separation grid has been developed for debris flow defense. Previous model experiments showed that, compared to existing structures, this structure can continuously maintain its water–sediment separation function. However, in the structure design, the length of the separation grid is key to its success in separating water and sediment. This paper presents a theoretical formula for calculating the design length of the grid. The theoretical formula shows that the grid length relates to the debris flow velocity v x, the grid width B, and the grid incline angle θ. A series of model experiments were conducted in the laboratory to test the accuracy of the formula. The results show that the experimental value and the theoretical value for grid length form a linear relationship and the design length of the grid may be corrected by a coefficient. Further analysis indicates that the correction coefficient changes with the bulk density of debris flow. Finally, a formula for determining the grid design length is derived from the theoretical formula, corrected using a coefficient related to the bulk density of a debris flow.
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References
Canelli L, Ferrerol AM, Migliazza M, Segalini A (2012) Debris flow risk mitigation by the means of rigid and flexible barriers—experimental tests and impact analysis. Nat Hazards Earth Syst Sci 12:1693–1699
Gonda Y (2009) Function of a debris flow brake. Int J Eros Control Eng 2(1):15–21
Huebl J, Fiebiger G (2005) Debris-flow mitigation measures. In: Jakob M, Hungr O (eds) Debris-flow hazards and related phenomena. Springer, Berlin, pp 445–487
Kim Y, Nakagawa H, Kawaike K, Zhang H (2012) Numerical and experimental study on debris flow breaker. Disaster Prev Res Inst Annals 55(B):471–481
Lien H (2003) Design of slit dams for controlling stony debris flows. Int J Sediment Res 18(1):74–87
Mizuyama T (2008) Structural countermeasures for debris flow disasters. Int J Eros Control Eng 1(2):38–43
Ono GI, Mizuyama T, Matsumura K (2004) Current practices in the design and evaluation of steel sabo facilities in Japan. In: Proceedings of the interpraevent international symposium, Riva del Garda, Italy, VII:253–264
Takahara T, Matsumura K (2008) Experimental study of the sediment trap effect of steel grid-type sabo dams. Int J Eros Control Eng 1(2):73–78
Wehrmann H, Huebl J, Holzinger G (2006) Classification of dams in torrential watersheds. Disaster mitigation of debris flows, slope failures and landslide. Universal Academy Press, Tokyo, pp 829–838
Wendeler C, McArdell BW, Rickenmann D, Volkwein A, Roth A, Denk M (2006) Field testing and numerical modeling of flexible debris flow barriers. In: Proceedings of international conference on physical modelling in geotechnics, Hong Kong
Wendeler C, Volkwein A, Roth A (2008) Hazard prevention using flexible multi-level debris flow barriers. Interpraevent 2008—Conference Proceedings, vol 1, pp 547–554
Xie T, Yang H, Wei F, Gardner JS, Dai Z, Xie X (2014) A new water-sediment separation structure for debris flow defense and its model test. Bull Eng Geol Environ 73(4):947–958
Xu Q, Zhang S, Li WL (2012) The 13 August 2010 catastrophic debris flows after the 2008 Wenchuan earthquake, China. Nat Hazards Earth Syst Sci 12:201–216
Acknowledgments
This research was supported by the National Science and Technology Support Program (2011BAK12B00) and the International Cooperation Project of the Department of Science and Technology of Sichuan Province (Grant No. 2009HH0005).
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Xie, T., Wei, F., Yang, H. et al. Calculation of the separation grid design length in a new water–sediment separation structure for debris flow defense. Bull Eng Geol Environ 75, 101–108 (2016). https://doi.org/10.1007/s10064-015-0726-9
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DOI: https://doi.org/10.1007/s10064-015-0726-9