Wood density and moisture sorption and its influence on large wood mobility in rivers

Ruíz-Villanueva, Virginia; Piégay, Hervé; Gaertner, Vincent; Perret, Franck; Stoffel, Markus

doi:10.1016/j.catena.2016.02.001

Cited by 48 publications

(40 citation statements)

References 41 publications

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“…Thus, Figure b shows the variability in the density of in‐stream wood (including contained moisture) delivered from a single catchment in France surveyed after different floods. Environmental conditions and processes in rivers are very different from the forests that supply the wood, suggesting that using standard values or relationships extracted from inventories of living trees or dead wood in forests should be incorporated into fluvial large wood studies with caution [ Ruiz‐Villanueva et al ., ].…”

Section: Advances In Quantifying Large Wood Entrainment and Transportmentioning

confidence: 99%

“…Without explicitly taking account of the influence of large wood on the hydraulics, Figure 14. Relative frequency of wood density (kg m À3 ) for (a) American, African, and Asian tropical tree species [Brown, 1997] and (b) in-stream wood pieces stored in a reservoir and extracted during several surveys (June 2013, September 2013, and November 2014, [Ruiz-Villanueva et al, 2016c).…”

Section: Linking Large Wood and Hydrodynamicsmentioning

confidence: 99%

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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

201

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: Advances In Quantifying Large Wood Entrainment and Transportmentioning

confidence: 99%

Section: Linking Large Wood and Hydrodynamicsmentioning

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

201

194

View full text Add to dashboard Cite

show abstract

“…These datasets can also be used to validate numerical models of wood transport and deposition (e.g. Ruiz-Villanueva et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Porosity problems: Comparing and reviewing methods for estimating porosity and volume of wood jams in the field

Livers

Lininger

Kramer

et al. 2020

Earth Surf Processes Landf

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Porosity, or void space, of large wood jams in stream systems has implications for estimating wood volumes and carbon storage, the impacts of jams on geomorphic and ecological processes, and instream habitat. Estimating porosity and jam dimensions (i.e. jam volume) in the field is a common method of measuring wood volume in jams. However, very few studies explicitly address the porosity values in jams, how porosity is calculated and assessed for accuracy, and the effect such estimates have on carbon and wood budgets in river corridors. We compare methods to estimate jam porosity and wood volume using field data from four different depositional environments in North America (jam types include small in-channel jams, large channel-margin jams, a large island apex jam, and a large coastal jam), and compare the results with previous studies. We find that visual estimates remain the most time-efficient method for porosity estimation in the field, although they appear to underpredict back-calculated porosity values; the accuracy of jam porosity, and thus wood volume, estimates are difficult to definitively measure. We also find that porosity appears to be scale invariant, dictated mostly by jam type, (which is influenced by depositional processes), rather than the size of the jam. Wood piece sorting and structural organization are likely the most influential properties on jam porosity, and these factors vary according to depositional environment. We provide a framework and conceptual model that uses these factors to demonstrate how modeled jam porosity values differ and give recommendations as a catalyst for future work on porosity of wood jams. We conclude that jam type and size and/or the study goals may dictate which porosity method is the most appropriate, and we call for greater transparency and reporting of porosity methods in future studies.

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“…10 mm (Figure 3). The density of the model LW ρ LW ≈ 700 kg/m 3 is comparable to prototype values [23]. In the beginning, uniform bed material was tested in order to avoid additional effects due to the formation of an armor layer (Figure 4a).…”

Section: Model Large Wood and Bed Materialsmentioning

confidence: 68%

Hazards due to large wood accumulations: Local scour and backwater rise

et al. 2018

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Large wood (LW) in rivers increases the flow variability and provides habitats for various species. During flood events, transported logs can accumulate at river infrastructures and increase the flood hazard. LW accumulations result in an upstream backwater rise and may increase local scour, for instance at bridge piers. Consequently, estimates of the resulting backwater rise and local scour are necessary to improve the flood hazard assessment. This study presents the findings of flume experiments with a movable bed on local scour and backwater rise due to LW accumulations. The approach flow conditions and the bed material were varied systematically for a specific LW accumulation volume. For all experiments, the initial condition for the bed material was defined as weak transport, since the bed shear stress was slightly below the critical bed shear stress for incipient motion. The inflow Froude number was identified as the governing parameter for backwater rise due to LW accumulations. The present study confirms the hypothesis that the resulting local scour reduces backwater rise. For the local scour, the unit discharge and the grain size diameter are the decisive parameters.

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Wood density and moisture sorption and its influence on large wood mobility in rivers

Cited by 48 publications

References 41 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

Porosity problems: Comparing and reviewing methods for estimating porosity and volume of wood jams in the field

Hazards due to large wood accumulations: Local scour and backwater rise

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