The continuum of wood-induced channel bifurcations

Marshall, Anna; Wohl, Ellen

doi:10.3389/frwa.2023.1155623

Cited by 5 publications

(3 citation statements)

References 118 publications

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“…Fundamentally, large wood increases hydraulic roughness, obstructs flow, and alters erosional force (Piégay, 1993) and substrate erosional resistance (Collins et al., 2012) in the channel and floodplain. The net effect of large wood stored at least temporarily in the river corridor is to increase spatial heterogeneity via processes such as. Bar and secondary channel formation (Collins et al., 2012; Marshall & Wohl, 2023; Montgomery & Abbe, 2006; Polvi & Wohl, 2013) Meander geometry and rate/direction of meander migration (Abbe & Montgomery, 1996; Daniels & Rhoads, 2004; Gurnell et al., 2002; Hickin, 1984; Piégay, 1993) Topographic and substrate heterogeneity within the channel (e.g., scour exposing coarse sediment at the upstream flow divergence around the wood; fine sediment deposition in zones of slower flow created by the wood) (Gurnell et al., 2005) Instream aggradation (Brooks et al., 2003) Channel avulsion and formation/abandonment of secondary channels (Collins et al., 2012; Jeffries et al., 2003; Marshall & Wohl, 2023; Wohl, 2011; Wohl & Iskin, 2022) Floodplain roughness (Wohl, 2013, 2020) Channel‐floodplain connectivity (Keys et al., 2018; Sear et al., 2010; Wohl, 2013) Lateral and vertical accretion of floodplains (Sear et al., 2010; Wohl, 2013) …”

Section: Introductionmentioning

confidence: 99%

“…Bar and secondary channel formation (Collins et al., 2012; Marshall & Wohl, 2023; Montgomery & Abbe, 2006; Polvi & Wohl, 2013)…”

Section: Introductionmentioning

confidence: 99%

“…Channel avulsion and formation/abandonment of secondary channels (Collins et al., 2012; Jeffries et al., 2003; Marshall & Wohl, 2023; Wohl, 2011; Wohl & Iskin, 2022)…”

Section: Introductionmentioning

confidence: 99%

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Interactions of Logjams, Channel Dynamics, and Geomorphic Heterogeneity Within a River Corridor

Marshall,

Wohl,

Iskin

et al. 2024

Water Resources Research

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Natural rivers are inherently dynamic. Spatial and temporal variations in water, sediment, and wood fluxes both cause and respond to an increase in geomorphic heterogeneity within the river corridor. We analyze 16 two‐km river corridor segments of the Swan River in Montana, USA to examine relationships between logjams (distribution density, count, and persistence), channel dynamism (total sinuosity and average channel migration), and geomorphic heterogeneity (patch density) in the river corridor. We hypothesize that (a) more dynamic river segments correlate with a greater presence, persistence, and distribution of logjams; (b) higher annual peak discharges correspond with greater channel dynamism and logjam presence and distribution; and (c) greater logjam distribution densities and channel dynamism are predictive of more spatially heterogeneous sections of the river corridor. Our results suggest that, first, decadal‐scale channel dynamism, as reflected in total sinuosity, corresponds to greater numbers of logjams and greater persistence of logjams through time. Second, higher peak discharges correspond to greater presence and distribution of logjams, but not to greater channel dynamism. Third, greater geomorphic heterogeneity in the river corridor, as reflected in the spatial distribution of landscape patch density, is explained by greater logjam distribution density, total sinuosity, and proportions of beaver meadows. Our results reflect the complex interactions of water, sediment, and wood in river corridors; the difficulties of interpreting causal relationships among these variables through time; and the importance of spatial and temporal analyses of past and present river processes to understand future river conditions.

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Section: Introductionmentioning

confidence: 99%

“…Bar and secondary channel formation (Collins et al., 2012; Marshall & Wohl, 2023; Montgomery & Abbe, 2006; Polvi & Wohl, 2013)…”

Section: Introductionmentioning

confidence: 99%

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Interactions of Logjams, Channel Dynamics, and Geomorphic Heterogeneity Within a River Corridor

Marshall,

Wohl,

Iskin

et al. 2024

Water Resources Research

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Defining the length parameter in river bifurcation models: a theoretical approach

Redolfi

2023

Earth Surf Processes Landf

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SummaryOne‐dimensional models for river bifurcations rely on a nodal point relation that determines the distribution of sediments between the downstream branches. The most widely‐adopted nodal point relation describes the two‐dimensional topographic effects exerted by the bifurcation by introducing two computational cells, located just upstream the bifurcation node, that laterally exchange water and sediments. The results of this approach strongly depend on a dimensionless parameter that represents the ratio between the cell length and the main channel width, whose value needs to be empirically estimated. Previous works proposed calibrating this parameter on the basis of more complete two‐dimensional linear models, which directly solve the momentum and mass conservation equations. This study demonstrates that a full consistency between the one‐dimensional approach and the two‐dimensional models can be directly achieved by adopting different scaling for the bifurcation cell length, which results in a theoretically‐defined and constant dimensionless length parameter. Comparison with experimental observations reveals that this physically‐based scaling yields more accurate predictions of bifurcation stability and discharge asymmetry. This indicates that the proposed method may provide a more reliable and precise estimation of the cell length, potentially improving the performance of one‐dimensional models for bifurcation processes in rivers.

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Working with wood in rivers in the Western United States

Ockelford,

Wohl,

Ruiz‐Villanueva

et al. 2024

River Research & Apps

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Recognition of the important physical and ecological roles played by large wood in channels and on floodplains has grown substantially during recent decades. Although large wood continues to be routinely removed from many river corridors worldwide, the practice of wood reintroduction has spread across the United States, the United Kingdom and western Europe, Australia, and New Zealand. The state‐of‐science regarding working with wood in rivers was discussed during a workshop held in Colorado, USA, in September 2022 with 40 participants who are scientists and practitioners from across the USA, UK, Europe, and Japan. The objectives of this paper are to present the findings from the workshop; summarize two case studies of wood in river restoration in the western United States; and provide suggestions for advancing the practice of wood in river management. We summarize the workshop results based on participant judgements and recommendations with respect to: (i) limitations and key barriers to using wood, which reflect perceptions and practicalities; (ii) gaps in the use of large wood in river management; (iii) scenarios in which wood is generally used effectively; and (iv) scenarios in which wood is generally not used effectively. The case studies illustrate the importance of the local geomorphic context, the configuration complexity of the wood, and the potential for modification of river corridor morphology to enhance desired benefits. Moving forward, we stress the importance of collaboration across disciplines and across communities of research scientists, practitioners, regulators, and potential stakeholders; accounting for stakeholder perceptions of the use of large wood; and increasing non‐scientist access to the latest state‐of‐science knowledge.

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The continuum of wood-induced channel bifurcations

Cited by 5 publications

References 118 publications

Interactions of Logjams, Channel Dynamics, and Geomorphic Heterogeneity Within a River Corridor

Interactions of Logjams, Channel Dynamics, and Geomorphic Heterogeneity Within a River Corridor

Defining the length parameter in river bifurcation models: a theoretical approach

Working with wood in rivers in the Western United States

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