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Statistical analysis of sand grain/bed collision process recorded by high‐speed digital camera
Author(s) -
WANG DAWEI,
WANG YUAN,
YANG BIN,
ZHANG WEI,
Lancaster Nick
Publication year - 2008
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.2007.00909.x
Subject(s) - collision , coefficient of restitution , kinetic energy , geology , settling , high speed camera , range (aeronautics) , mechanics , process (computing) , mineralogy , materials science , physics , optics , computer science , classical mechanics , thermodynamics , composite material , computer security , operating system
A high‐speed digital camera was employed to record the sand grain/bed collision process. With image processing and a statistical method, a series of parameters of the collision process were obtained. The results show that the collision process of a grain with rebounding can be represented by two parameters: the kinetic energy restitution coefficient and the collision angle. Both parameters satisfy a normal distribution, and they are dependent on one another. With an increase of the collision angle, the distribution of the kinetic energy restitution gradually reduces from a broad to a narrow range with low values. The percentage of vertical velocity restitution coefficients greater than 1 can reach 70% or more, which ensures that the settling time of the sand grains in the air increases and that they receive more energy from the air to progress the saltation movement.