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Measuring internal velocity of Debris Flows by Temporally Correlated Shear Forces

Journal of Earth Science 2012年第3期23卷 373-380页

作者：韦方强杨红娟胡凯衡 Sergey Chernomorets Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences Faculty of Geography Moscow State UniversityMoscowRussia

Debris flow is a kind of geological hazard occurring in mountain *** velocity is very important for debris flow dynamics research and designing debris flow control ***,most of past researches focused on surface velocity and mean velocity of debris flow,while few researches involve its internal velocity because there is no available method for measuring the internal velocity for its destructive *** this paper,a method of temporally correlated shear forces（TCSF） for meas-uring the internal velocity of debris flows is *** principle of this method is to calculate the internal velocity of a debris flow using the distance between two detecting sections and the time differ-ence between the two waveforms of shear forces measured at both *** measuring method has been tested in 14 lab-based flume experiments.

关键词： debris flow internal velocity velocity measuring shear force flume experiment

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Measuring the internal velocity of Debris Flows Using Impact Pressure Detecting in the Flume Experiment

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Journal of Mountain Science 2011年第2期8卷 109-116页

作者： YANG Hongjuan WEI Fangqiang HU Kaiheng Sergey CHERNOMORETS HONG Yong LI Xiaoyu XIE Tao Key Laboratory of Mountain Hazards and Surface Process ChineseAcademy of Sciences Chengdu 610041 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Faculty of Geography Moscow State University Moscow Russia

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.

关键词： internal velocity Measurement Debris flow Impact pressure

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