Front velocity and deposition characteristics of debris avalanches using physical modeling test
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ORIGINAL PAPER
Front velocity and deposition characteristics of debris avalanches using physical modeling test Hailong Yang 1 & Xiaoyi Fan 2,3 & Xiangjun Pei 1 Received: 22 October 2018 / Accepted: 31 July 2019 / Published online: 9 September 2019 # Saudi Society for Geosciences 2019
Abstract Physical modeling test was designed to study the effects of slope angle, released volume, and type of materials on the front velocity and deposition characteristics of debris avalanches. An improved empirical prediction model of front velocity was proposed for quantitatively describing the characteristic of front velocity according to staged motion feature of mass-front particles of debris avalanches. In view of the overall variation tendency of velocity curve, the calculated curves of the front velocity agree well with the experimental curves and the average error of the maximum velocity and average velocity are 5.72% and 4.34% respectively. The practicability of the empirical prediction of front velocity was further verified by carrying out 3 new groups of physical modeling test. With regard to the deposition characteristics, the change of deposit shape reflects the variation characteristic of deposit thickness along the median longitudinal section. The center-of-mass coordinate of deposit shape might be a useful indicator for quantitative analysis of the change of deposit shape. Finally, an empirical formula was also proposed for describing the mathematical relationships between center-of-mass coordinate of deposit shape and parameter indicators of the influence factors. Keywords Debris avalanches . Front velocity . Deposit thickness . Deposit shape . Center-of-mass coordinate
Introduction It is generally known that the temporal and spatial variation of motion parameters (such as velocity, travel distance, and equivalent coefficient of friction) and the deposition characteristics of
Editorial handling: Zeynal Abiddin Erguler * Xiaoyi Fan [email protected] Hailong Yang [email protected] Xiangjun Pei [email protected] 1
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China
2
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, Sichuan, China
3
School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
debris avalanches (such as deposition morphology, deposit thickness, sequence structure and particle distribution) are essential to back analysis for dynamic evolution process of mass movement of debris avalanches (eg. Hutter and Koch 1991; Manzella and Labiouse 2009; Yang et al. 2011; Fan et al. 2016) since they provide reliable scientific bases for revealing the movement mechanism of debris avalanches (Wang et al. 2016). At present, the field investigations, physical modeling tests and numerical simulations are main research tools for analysis the dynamic behavior during transport of debris avalanches (Zh
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