9.8 Bedload Kinematics and Fluxes

Haschenburger, Judith K.

doi:10.1016/b978-0-12-374739-6.00233-5

Cited by 28 publications

(4 citation statements)

References 204 publications

(214 reference statements)

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“…Unlike water and sediment dynamics, for which extensive research commenced at the beginning of the twentieth century [ Haschenburger , ], research on large wood dynamics in rivers has only become an important focus for research over the last three decades. As a result, this research remains at a relatively early stage, perhaps similar to that reached in the 1960s for water or suspended sediment monitoring, with many fundamental questions still open.…”

Section: Remaining Challengesmentioning

confidence: 99%

Recent advances quantifying the large wood dynamics in river basins: New methods and remaining challenges

Ruíz-Villanueva

Piégay

Gurnell

et al. 2016

Reviews of Geophysics

205

194

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Large wood is an important physical component of woodland rivers and significantly influences river morphology. It is also a key component of stream ecosystems. However, large wood is also a source of risk for human activities as it may damage infrastructure, block river channels, and induce flooding. Therefore, the analysis and quantification of large wood and its mobility are crucial for understanding and managing wood in rivers. As the amount of large-wood-related studies by researchers, river managers, and stakeholders increases, documentation of commonly used and newly available techniques and their effectiveness has also become increasingly relevant as well. Important data and knowledge have been obtained from the application of very different approaches and have generated a significant body of valuable information representative of different environments. This review brings a comprehensive qualitative and quantitative summary of recent advances regarding the different processes involved in large wood dynamics in fluvial systems including wood budgeting and wood mechanics. First, some key definitions and concepts are introduced. Second, advances in quantifying large wood dynamics are reviewed; in particular, how measurements and modeling can be combined to integrate our understanding of how large wood moves through and is retained within river systems. Throughout, we present a quantitative and integrated meta-analysis compiled from different studies and geographical regions. Finally, we conclude by highlighting areas of particular research importance and their likely future trajectories, and we consider a particularly underresearched area so as to stress the future challenges for large wood research.

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Section: Remaining Challengesmentioning

confidence: 99%

Recent advances quantifying the large wood dynamics in river basins: New methods and remaining challenges

Ruíz-Villanueva

Piégay

Gurnell

et al. 2016

Reviews of Geophysics

205

194

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“…In gravel‐bed alluvial rivers, episodic bed material transport is the most significant factor controlling a river evolution and morphodynamic processes (Ashmore, ; Church, ; Church & Ferguson, ; Ferguson, ). A reliable estimation of bed material transport is a key issue to address several questions (e.g., river morphodynamics study and flood risk management), but it is notoriously hard to achieve (Ferguson, ; Haschenburger, ). One of the most used solutions to address this issue is through theoretically based formulas (e.g., Recking et al, ), but often the application of different relations proposed for a given context provides strongly incongruent estimates (Gomez & Church, ; López et al, ; Martin & Ham, ).…”

Section: Introductionmentioning

confidence: 99%

Virtual Velocity Approach for Estimating Bed Material Transport in Gravel‐Bed Rivers: Key Factors and Significance

Brenna

Surian

Mao

2019

Water Resources Research

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In large gravel-bed rivers, bed material transport estimation is challenging since theoretically based formulas often fail to accurately predict sediment fluxes, and it is difficult to carry out field measurements. A viable alternative to direct measurement is provided by the virtual velocity approach representing a hybrid solution to calculate the bed material transport based on a theoretical framework and use of tracers. This work aims to improve the methodology and to assess the role of input factors through a case-study application carried out in the Parma River (Italy). Two tracer types and scour chains were deployed at four sections. Data on water level, transport processes, particle travel distances, and active layers were collected over 17 months and 6 events. The transport that occurred during two events was calculated applying different configurations taking in account for several input factors (i.e., grain size, water stage, and topography). Applying simple or more complex configurations led to significant differences in transport estimates: In relation to channel morphodynamics, different factors (e.g., variability of water level within the cross section in multithread channels) play a key role on transport processes. Results indicate that it is crucial to collect and process field data developing reach-specific transport rating curves and to combine different type of tracers for monitoring the clast displacement lengths. Based on the methodological improvements and sensitivity analysis addressed in this study, we developed a decision tree in order to design future applications of the virtual velocity approach for estimating the bed material load in different gravel-bed river contexts.

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“…Washload requires so little energy to be transported that it tends to remain in suspension for hours or days even in areas of still water. Bedload transport is typically discontinuous in time and space (Haschenburger, 2013). Figure 8 Simplified illustration of hydraulics in a natural channel.…”

Section: Sediment Transport In Streamsmentioning

confidence: 99%

Streams

Wohl¹

2013

Reference Module in Earth Systems and Environmental Sciences

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9.8 Bedload Kinematics and Fluxes

Cited by 28 publications

References 204 publications

Recent advances quantifying the large wood dynamics in river basins: New methods and remaining challenges

Recent advances quantifying the large wood dynamics in river basins: New methods and remaining challenges

Virtual Velocity Approach for Estimating Bed Material Transport in Gravel‐Bed Rivers: Key Factors and Significance

Streams

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