Bedload estimation in large sand-bed rivers using Acoustic Mapping Velocimetry (AMV)
Bedload estimation in large sand-bed rivers using Acoustic Mapping Velocimetry (AMV)
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DOI：
10.1016/j.geomorph.2022.108562
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发表时间：
2022-12
期刊：
影响因子：
3.9
通讯作者：
S. Baranya;G. Fleit;M. Muste;R. Tsubaki;J. Józsa
中科院分区：
文献类型：
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作者：
S. Baranya;G. Fleit;M. Muste;R. Tsubaki;J. Józsa
本文介绍了在现场实施的一个最近开发的推移质输运估计方法，称为声学测绘测速（AMV）。该方法结合了声学和图像为基础的方法的组件和处理协议，以提供在河床中迁移的底形的速度图。AMV的实施与重复的多波束回声测深仪（MBES）映射，获得沿沿着纵向带在整个横断面的研究河段。本文阐述了AMV实施案例研究，导致在两个大的砂床河流：俄亥俄州和密西西比河，在美国的推移质输沙率的估计。与这些案例研究相关的分析强调了将底形动力学特征与AMV处理数据采集期间使用的时空参数选择相联系的重要性（例如，测量段所需的长度，以及重复测量之间的时间滞后的影响），以准确量化底形动力学。叠加次级小底形迁移的大的主要的，在其贡献的泥沙输运方面的作用，也进行了讨论。该论文证明了这种新技术的适用性，作为量化大型砂床河流推移质输运的补充或独立方法，在该领域，传统方法的实施很困难且不充分，而新兴的测量替代方案尚未得到广泛认可。
This paper describes the in-situ implementation of a recently developed bedload transport estimation method, called Acoustic Mapping Velocimetry (AMV). The method combines components and processing protocols from acoustic and image-based methods to provide velocity maps of bedforms migrating in the riverbed. The AMV implementation is illustrated with repeated Multibeam Echo Sounder (MBES) mappings that are acquired along longitudinal swaths over the entire transect of the study river sections. The paper exemplifies AMV implementation case studies leading to the estimation of bedload transport rates in two large sand-bed rivers: the Ohio and Mississippi rivers, in the USA. The analysis associated with these case studies emphasizes the importance of linking the characteristics of the bedform dynamics with the selection of the spatio-temporal parameters used during data acquisition for AMV processing (e.g., required length of the measurement section, and the effect of the time lag between the repeated surveys) for accurate quantification of bedform dynamics. The role of superimposed secondary small bedforms migrating over the large primary ones, in terms of their contribution to the sediment transport, is also discussed. The paper demonstrates the applicability of this novel technique, as a complement or stand-alone method for quantifying bedload transport in large sand-bed rivers, an area where the implementation of conventional methods is difficult and inadequate while the emerging measurement alternatives are not widely recognized yet.