Response of Woody Debris for Flows Around Hydraulic Structures

Akahori, Rena; Hatta, Natsuo; Shimizu, Yasuyuki; Ito, Akashi

doi:10.2208/jscejhe.70.i_691

Cited by 3 publications

(3 citation statements)

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“…Note that the original observation data (flow field and physical model of LW) of the experimental results were obtained in our previous study (Akahori et al., 2014).…”

Section: Methodsmentioning

confidence: 99%

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Transport Dynamics of Large Wood in a Stream Channel Affected by Spur Dikes

Akahori

Yamaguchi

Yabe

et al. 2023

Water Resources Research

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Large-wood (LW) transport mechanisms in river channels have been widely studied to address various issues that relate to natural environments and human societies, such as the diversity of natural ecosystems and the flood control of neighboring river systems. The presence of LW in natural channels is recognized to play a positive role in the environment, and previous studies have investigated LW dynamics (e.g.,

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“…Note that the original observation data (flow field and physical model of LW) of the experimental results were obtained in our previous study (Akahori et al., 2014).…”

Section: Methodsmentioning

confidence: 99%

“…The data set of the results of the laboratory experiment used in this study was published by Akahori et al. (2014). The data set of the original CSV files of contour graphics and FFT results is available at https://doi.org/10.6084/m9.figshare.19102100.v2.…”

Section: Data Availability Statementmentioning

confidence: 99%

Transport Dynamics of Large Wood in a Stream Channel Affected by Spur Dikes

Akahori

Yamaguchi

Yabe

et al. 2023

Water Resources Research

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“…The behavior of driftwood in rivers is quite complex, and it is challenging to model the transport of individual pieces of driftwood. There are roughly two types of driftwood transport models: (1) Eulerian models which express wood transport using the advectiondispersion equation (e.g., [27]), and (2) a Lagrangian model which tracks the motion of individual wood pieces (e.g., [6,17,19,28,29]). The Lagrangian approach is a more straightforward approach for modeling driftwood behavior because of the complex motions that individual wood pieces go through.…”

Section: Driftwood Model: Lagrangian Approachmentioning

confidence: 99%

The Role of Large-Scale Bedforms in Driftwood Storage Mechanism in Rivers

Okitsu

Iwasaki

Kyuka

et al. 2021

Water

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The quantification of driftwood deposition in rivers is important for understanding the total budget of driftwood at the watershed scale; however, it remains unclear how such driftwood storage in rivers contributes to the overall system because of the difficulties in undertaking field measurements. Herein, we perform numerical simulations of driftwood deposition within an idealized river reach with a sand-bed, to describe the role of large-scale bedforms, more specifically, alternate bars, multiple bars, and braiding, in driftwood storage in rivers. The numerical model we propose here is a coupling model involving a Lagrangian-type driftwood model and an Eulerian two-dimensional morphodynamic model for simulating large-scale bedforms (i.e., bars and braiding). The results show that the channel with a braiding pattern provides a wide area with enhanced capacity for deposition of driftwood, characterized by exposed mid-channel or in-channel bars, leading to high driftwood storage. The alternate bar is also a large bedform representing a sediment depositional element in rivers; however, because of the narrow exposed bar area and its downstream-migrating feature during floods, the alternate bars seem to contribute less to driftwood deposition in rivers. This suggests that the role of multiple bars and braiding is critically important for the driftwood deposition in rivers.

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