Wavelet Method to Extract Shock Signal of Debris Flow

Abstract:

The shock signal’s fluctuation characteristics of debris flow stem from two aspects, one is the composition of debris flow with the solid and the liquid, another is the surging property of debris flow in motion. Based on the initial shock signals collected in model experiment in laboratory, 9 shock spectrum levels are decomposed by the db8 wavelet method, i.e., 0~0.195Hz, 0.195~ 0.391Hz, 0.391~0.781Hz, 0.781~1.5625Hz, 1.563~3.125Hz, 3.125~ 6.25Hz, 6.25~12.5 Hz, 12.5~25Hz, and 25~50Hz. Taking the peak each shock spectrum as the standard, the energy distribution curves of 9 shock spectrum levels are obtained. These curves display that the shock energy of debris flow focus on the low frequency smaller than 1.0Hz, and the percentage below 6.25Hz is about 95%. The results provide a reference to select wallop peak as the design load of structures against debris flow disaster.

• Periodical: Advanced Materials Research (Volumes 199-200)
• Pages: 958-965
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.199-200.958
• Online since: February 2011
• Authors: Hong Kai Chen, Hong Mei Tang, Yu Ping Zhang, Xiao Ying He
• Keywords: Debris Flow, Experiment, Shock Signal, Wavelet Method

References

[1] Chen H K, Tang H M, Chen Y Y. Mechanics of debris flow along highway. Beijing: The Science Press, 2007. (in Chinese).

[2] Wu J S, Tian L Q, Kang Z C, et al. Debris flow and comprehensive management. Beijing: The Science Press, 1993. (in Chinese).

[3] Zhang S C. A review on the research of debris flow. Advances in Mechanics, 1989, 19(3): 365-375. (in Chinese).

[4] Chen H K, Tang H M, Ye S Q. Study on debris flows along highways in China. The Chinese Journal of Geological Hazard and Control, 2008, 19(1): 1-5. (in Chinese).

[5] Wu J S. Observations and studies on debris flow in Jiangjiagou, Yunnan province. Beijing: The Science Press, 1990. (in Chinese).

[6] Liu L J, Wei H. Study of impace of debris flow. Journal of Sichuan Union University (Engineering Science Edition), 1997, 1(2): 99-102. (in Chinese).

[7] Wei H. Experimental study on wallop of debris flow heads. China Railway Science, 1996, 17(3): 50-62. (in Chinese).

[8] Zhang Y, Wei F Q, Wang Q. Wallop calculation of viscous debris flow based momentum conservation. Journal of Sediment Research, 2006, (3): 23-26. (in Chinese).

[9] Valentino R, Barla G, Montrasio L. Experimental analysis and micromechanical modeling of dry granular flow and impacts in laboratory flume tests. Rock Mechanics and Rock Engineering, 2008, 41(1): 153-177.

DOI: 10.1007/s00603-006-0126-3

[10] Armento M C, Genevois R, Tecca P R. Comparison of numerical models of two debris flows in the Cortina d'Ampezzo area, Dolomites, Italy. Landslides, 2008, (5): 143-150.

DOI: 10.1007/s10346-007-0111-2

[11] Chen H K, Du R H, Tang H M, Wang Q C. Study on blasting mechanism of high pressure core in debris flow. Journal of Chongqing Jiaotong University(Natural Science), 2008, 27(5): 790-793. (in Chinese).

[12] Chen H K, Tang H M, Wu S F. Research on abrasion of debris flow to high-speed drainage structure. Applied Mathematics and Mechanics, 2004, 25(11): 1257-1264.

DOI: 10.1007/bf02438281

[13] Chen H K, Tang H M. Method to calculate wallop and impact time of two-phase debris flow. China Journal of Highway and Transport, 2006, 19(3): 19-23. (in Chinese).

[14] Chen H K, Tang H M. Essential principle of debris flow dynamics. WSEAS Transactions on Fluid Mechanics, 2006, 10(1): 932-936.