Measuring the internal velocity of debris flows using impact pressure detecting in the flume experiment |
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| Authors: | Hongjuan Yang Fangqiang Wei Kaiheng Hu Sergey Chernomorets Yong Hong Xiaoyu Li Tao Xie |
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| Institution: | (1) J. M. Burgers Centre for Fluid Dynamics, Delft University of Technology, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands;(2) Department of Civil and Environmental Engineering, University College London, Gower Street, London, WC1E 6BT, UK |
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| Abstract: | Measuring the internal velocity of debris flows is very important for debris flow dynamics research and designing debris flow
control works. However, there is no appropriate method for measuring the internal velocity because of the destructive power
of debris flow process. In this paper, we address this problem by using the relationship between velocity and kinetic pressure,
as described by surface velocity and surface kinetic pressure data. Kinetic pressure is the difference of impact pressure
and static pressure. The former is detected by force sensors installed in the flow direction at the sampling section. Observations
show that static pressure can be computed using the formula for static water pressure by simply substituting water density
for debris flow density. We describe the relationship between surface velocity and surface kinetic pressure using data from
seven laboratory flume experiments. It is consistent with the relationship for single phase flow, which is the measurement
principle of the Pitot tube. |
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| Keywords: | Internal velocity Measurement Debris flow Impact pressure |
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