Laboratory flume experiments with the Swiss plate geophone bed load monitoring system: 1. Impulse counts and particle size identification
Laboratory flume experiments with the Swiss plate geophone bed load monitoring system: 1. Impulse counts and particle size identification
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使用瑞士平板地震检波器床载监测系统进行的实验室水槽实验： 1. 脉冲计数和颗粒尺寸识别
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
R. Boes
中科院分区：
文献类型：
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作者：
C. Wyss;D. Rickenmann;B. Fritschi;J. Turowski;V. Weitbrecht;R. Boes
我们进行了系统的水槽实验，使用天然推移质颗粒，以量化不同参数的影响，由瑞士板检波器，推移质代理监测系统登记的信号。据观察，从原始信号计算的脉冲数显然取决于床颗粒尺寸，平均流速，床粗糙度，并在较小程度上对颗粒形状。研究发现，推移质颗粒与地震检波器板碰撞产生的信号的形心频率与颗粒尺寸呈负相关，但对平均流速和河床粗糙度变化的敏感性低于信号幅度，后者也与颗粒尺寸有关。结合频率和振幅的信息，导致在一个更强大的识别输送的颗粒尺寸在很宽的尺寸范围内比单独使用振幅信息。
We performed systematic flume experiments using natural bed load particles to quantify the effect of different parameters on the signal registered by the Swiss plate geophone, a bed load surrogate monitoring system. It was observed that the number of impulses computed from the raw signal clearly depends on bed particle size, mean flow velocity, bed roughness, and to a minor extent on particle shape. The centroid frequency of the signal resulting from the collision of a bed load particle against the geophone plate was found to be inversely related to particle size but to be less sensitive to variations in mean flow velocity and bed roughness than the signal amplitude, which is also related to particle size. Combining frequency and amplitude information resulted in a more robust identification of the transported particles size over a wide range of sizes than using amplitude information alone.