ABSTRACT This paper provides an evaluation of a hydro-acoustic technique for efficient quantification of the bedload transport in riverine environments. Stationary bedload measurements were conducted simultaneously at different study sites, using three different acoustic Doppler current profilers (ADCP) working at four different frequencies. The raw apparent bedload velocities were de-spiked and filtered in a streamwise direction. Then, functional correlations were observed between the magnitudes of the apparent velocities and the bedload transport rates measured by the conventional bedload sampler. Each ADCP yielded different results because of the different frequency backscatter sensitivity and acoustic penetration in the active bedload layer. In addition to the frequency, other acoustic parameters such as the percentage of the filtered data, transducers width, beam opening angle, beam-grazing angle and the pulse length, contributed to the acoustic bedload sampling. The influence of these parameters is examined, and recommendations are given for the performance and limitations of each instrument.

中文翻译：

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使用声学多普勒电流剖面仪对床载荷量化的声学采样效应

摘要本文提供了一种水声技术的评估，用于有效量化河流环境中的底物运输。使用三种不同的声学多普勒电流剖面仪 (ADCP) 在四个不同的频率下工作，在不同的研究地点同时进行固定床载荷测量。原始表观床载荷速度被去除并沿流向过滤。然后，在表观速度的大小和由传统的床载采样器测量的床载传输速率之间观察到函数相关性。每个 ADCP 产生不同的结果，因为在活动床负载层中不同的频率反向散射灵敏度和声学穿透。除了频率，其他声学参数，例如过滤数据的百分比，换能器宽度、波束张开角、波束掠过角和脉冲长度对声床载荷采样做出了贡献。检查了这些参数的影响，并针对每种仪器的性能和局限性给出了建议。