Constraining acoustic backscatter estimates of suspended sediment concentration profiles using the bed echo
Constraining acoustic backscatter estimates of suspended sediment concentration profiles using the bed echo
复制标题
使用河床回波对悬浮泥沙浓度剖面进行约束声学反向散射估计
DOI：
--
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
P. Hardcastle
中科院分区：
文献类型：
--
作者：
P. Thorne;G. P. Holdaway;P. Hardcastle
声背向散射技术在悬沙输移测量中的应用越来越广泛。这是由于声学的独特性质，能够使用单一仪器测量轮廓。此外，可以很容易地获得高空间和时间分辨率的剖面，这开始提供悬浮沉积物的详细图像，这有可能显著促进我们对悬浮过程的理解。然而，在浓度较高的时段，当泥沙散射引起的声波衰减变得明显时，用于获得悬浮泥沙剖面的反演技术，由于相对较小的误差∼5%-10%，可以产生发散到无穷远或零的无界浓度剖面。因此，在最具科学价值的时期，声学技术可能会遇到困难。在本工作中，利用床层回波来识别输入误差，并约束计算的浓度p。
The application of acoustic backscattering to the measurement of suspended sediment transport is being increasingly employed. This is due to the unique property of acoustics being able to measure profiles using a single instrument. Also the profiles can readily be obtained with a high spatial and temporal resolution, and this is beginning to provide detailed images of suspended sediments which have the potential to significantly advance our understanding of suspension processes. However, at periods of high concentration, when sound attenuation due to sediment scattering becomes significant, the inversion technique used to obtain the suspended sediment profiles, can, due to relatively small errors ∼5%–10%, generate unbounded concentration profiles which diverge to infinity or zero. Therefore at the periods of greatest scientific interest, the acoustic technique can encounter difficulties. In the present work the bed echo is utilized to identify the input errors, and constrain the calculated concentration p...