Structures like blunt-nosed chevrons, log deflectors and double-winged log frames help in modifying the flow regime in the channel by concentrating the flow and increasing navigability. Moreover, they create scour pools in the downstream stilling basin, which can be used either as fish refuge or as an in-stream storage site for previously dredged material. In this respect, the use of wood debris in the channel in the form of wood bundles has gained attention for the ability of these structures to integrate into the surrounding fluvial habitat and to divert the flow partially towards the central part of the channel when placed in curves. Considering the absence of studies dealing with wood bundles as a restoration structure, the aim of this paper is to analyse the scour mechanism and equilibrium scour morphology of wood bundles in straight and curved channels. In doing so, a wide range of hydraulic conditions, structure positions and configurations were tested. Thereafter, dimensional analysis was carried out to derive useful empirical relationships to predict the maximum scour depth and length as well as the maximum dune height based on a novel, equivalent Froude number, which accounts for the effects of channel curvature and structure position. Moreover, the various resulting scour morphology types were classified, and conditions of their existence were determined depending on the abovementioned Froude number and other key hydraulic parameters.

中文翻译：

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Wood Bundles 的冲刷功能

钝头人字形、原木偏转器和双翼原木框架等结构有助于通过集中流动和增加通航性来改变通道中的流动状态。此外，它们在下游的消力池中创建了冲刷池，可用作鱼类避难所或先前疏浚材料的河内储存场所。在这方面，由于这些结构能够融入周围的河流栖息地并在放置时将部分水流转向通道的中心部分，因此在通道中以木束的形式使用木屑已引起关注。曲线。考虑到缺乏将木捆作为修复结构的研究，本文的目的是分析直通道和弯通道中木束的冲刷机理和平衡冲刷形态。在此过程中，对各种水力条件、结构位置和配置进行了测试。此后，进行了尺寸分析以推导出有用的经验关系，以基于新的等效弗劳德数预测最大冲刷深度和长度以及最大沙丘高度，该数考虑了渠道曲率和结构位置的影响。此外，对产生的各种冲刷形态类型进行分类，并根据上述弗劳德数和其他关键水力参数确定其存在条件。此后，进行了尺寸分析以推导出有用的经验关系，以基于新的等效弗劳德数预测最大冲刷深度和长度以及最大沙丘高度，该数考虑了渠道曲率和结构位置的影响。此外，对产生的各种冲刷形态类型进行分类，并根据上述弗劳德数和其他关键水力参数确定其存在条件。此后，进行了尺寸分析以推导出有用的经验关系，以基于新的等效弗劳德数预测最大冲刷深度和长度以及最大沙丘高度，该数考虑了渠道曲率和结构位置的影响。此外，对产生的各种冲刷形态类型进行分类，并根据上述弗劳德数和其他关键水力参数确定其存在条件。