Measuring the Internal Velocity of Debris Flows Using Impact Pressure Detecting in the Flume Experiment  

作　　者：YANG Hongjuan WEI Fangqiang HU Kaiheng Sergey CHERNOMORETS HONG Yong LI Xiaoyu XIE Tao 

机构地区：[1]Key Laboratory of Mountain Hazards and Surface Process, ChineseAcademy of Sciences, Chengdu 610041, China [2]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China [3]Faculty of Geography, Moscow State University, Moscow, Russia

出　　处：《Journal of Mountain Science》2011年第2期109-116,共8页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 40771026);the NSFC-RFBR project (Grant No. 40911120089, 08-05-92206 NSFCa)

摘　　要：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 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TG249.2[自动化与计算机技术—控制科学与工程]