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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China
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Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China

机译：江家沟壑区泥石流冲击力的实时测量与初步分析

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摘要

Impact forces associated with major debris flows (Jiangjia Ravine, China, August 25, 2004) were recorded in real time by a system consisting of three strain sensors installed at different flow depths. This provides the first real-time and long-duration record of impact forces associated with debris flows. A comprehensive approach including low-pass filtering and moving average methods were used to preprocess the recorded signals. The upper limit of impact frequency in the debris flows was estimated at 188.66 Hz under the assumption that only coarse grains cause effective impact loadings. Thus, a low-pass filter with a 200 Hz cut-off frequency was needed to denoise the original data in order to extract the impact force. Then the moving average method was applied to separate long-term and random components of the filtered data. These were interpreted as, respectively, the fluid pressure and grain impact loading. It was found that the peak grain impacts at different depths were non-synchronous within the debris flows. The impact loadings were far greater than, and not proportional to the fluid pressures. Analysis of the impact force of 38 debris flow surges gives an empirical value for the ratio of the hydrodynamic pressure to the momentum flow density, i.e. the product of debrisflow density and mean velocity square, which provides a very valuable basis for understanding debris flow dynamics and designing debris flow management systems.
机译：与主要泥石流相关的冲击力（中国，江家沟，2004年8月25日）是由一个系统实时记录的，该系统由三个安装在不同深度的应变传感器组成。这提供了与泥石流相关的冲击力的第一个实时且长期的记录。包括低通滤波和移动平均法在内的综合方法用于预处理记录的信号。在仅粗粒引起有效冲击载荷的假设下，泥石流中冲击频率的上限估计为188.66 Hz。因此，为了提取冲击力，需要使用具有200 Hz截止频率的低通滤波器来对原始数据进行降噪。然后将移动平均法应用于分离滤波数据的长期和随机成分。这些分别解释为流体压力和颗粒冲击载荷。结果发现，在不同深度的峰值颗粒冲击在泥石流中是不同步的。冲击载荷远大于并且与流体压力不成正比。分析38个泥石流涌浪的冲击力可得出水动力压力与动量流密度之比的经验值，即泥石流密度与平均速度平方的乘积，这对于理解泥石流动力学和流体动力学提供了非常有价值的基础。设计泥石流管理系统。

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