The influence of a vegetated bar on channel-bend flow dynamics

Bywater‐Reyes, Sharon; Diehl, Rebecca M.; Wilcox, Andrew C.

doi:10.5194/esurf-2017-56

Cited by 12 publications

(21 citation statements)

References 53 publications

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“…Our results agree with the numerical findings of Bywater‐Reyes et al () and the experimental observations of Rominger et al () in a curved channel with fixed banks, who found that vegetation establishment on a bar directs the flow toward the opposite bank. At the same time, they found that the establishment of vegetation increases the rates of bar accretion through velocity reduction upstream and downstream of vegetated areas, which coincides with our measurements.…”

Section: Discussionsupporting

confidence: 93%

“…Since the pioneering work carried out by Hickin (), several studies have examined the effects of vegetation establishment on rivers from field observations (e.g., Serlet et al, [alternate bars]; Gran et al, [braided rivers], Bywater‐Reyes et al, [sinuous channels]). The presence of vegetation favors the stability of recently formed deposits and banks by deflecting the flow and increasing soil strength due to the mechanical reinforcement derived from root networks (Bywater‐Reyes et al, ; Pollen & Simon, ; Pollen‐Bankhead & Simon, ; Polvi et al, ). Vegetation furthermore decreases erosion by covering and, therefore, protecting the bare soil and reduces the pore water pressure by lowering the soil moisture content via interception and evapotranspiration (e.g., Terwilliger, ).…”

Section: Introductionmentioning

confidence: 99%

“…A few 2‐D models can reproduce river width variations treating bank erosion and accretion separately. However, in these models the representation of river bank accretion is still highly simplified (Asahi et al, ; Bertoldi et al, ; Bywater‐Reyes et al, ; Jang & Shimizu, , ; Kang et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study

et al. 2019

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While the scientific community has long recognized that alluvial rivers are the product of interactions between flowing water and bed material transport, it is increasingly evident that vegetation mediates these interactions and influences the stream channel characteristics. In a novel set of mobile bed laboratory experiments with variable discharge, we demonstrate that vegetation colonization affects bank erosion rates, channel shape, channel sinuosity, and bar pattern. Our analyses compared the morphological evolution of channels with initially steady bars considering the following three scenarios: (1) channel without vegetation, (2) channel with vegetation added to the floodplains, and (3) channel with vegetation added to both the floodplains and the bar surfaces that emerge at low flows. Absence of vegetation produced the widest and shallowest channel with the lowest sinuosity. Floodplain vegetation in the second scenario reduced bank erosion and resulted in a deeper and more sinuous channel with shorter bars. In the third scenario, vegetation establishment on emerging bar surfaces intensified erosion on the opposing bank, enlarging the amplitude of bends. Enhanced sedimentation on vegetated bar areas increased both bar elevation and bar length compared to the second scenario. The results show that the colonization of bar surfaces by plants creates the conditions for new floodplain and island formation, fostering channel meandering and anabranching. Finally, our experiments emphasize the role of alternating high and low flows on the morphological development of streams mediated by vegetation.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study

et al. 2019

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“…Using a set of mobile bed flume experiments with variable discharge and plastic plants, Vargas‐Luna et al . (2019) showed that with vegetation established on bars, river channels become shallower with an increase of sedimentation on vegetated bar areas increasing in elevation and length (see also Bennett et al ., 2002; Tal et al ., 2004; Perucca et al ., 2007; Braudrick et al ., 2009; Rominger et al ., 2010; Bywater‐Reyes et al ., 2018).…”

Section: Discussionmentioning

confidence: 99%

Formation and dynamics of vegetated fluvial landforms follow the biogeomorphological succession model in a channelized river

Corenblit

Vautier

González

et al. 2020

Earth Surf Processes Landf

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Feedback between hydrogeomorphological processes and riparian plants drives landscape dynamics and vegetation succession in river corridors. We describe the consequences of biogeomorphological feedback on the formation and dynamics of vegetated fluvial landforms based on observations from the channelized Isère River in France. The channel was laterally confined with embankments and mostly straightened. From the beginning of the 1970s to the end of the 1990s, alternate bars were progressively but heavily colonized by vegetation. This context presented an exceptional opportunity to analyse temporal adjustments between fluvial landforms and vegetation succession from bare gravel bars to mature upland forest as the consequence of biogeomorphological interactions. Based on a GIS analysis of aerial photographs (between 1948 and 1996), we show that the spatiotemporal organization of vegetated bars within the river channel observed in 1996 resulted from a bioconstruction and biostabilization effect of vegetation and interactions between bars of varying age, size and mobility. Field measurements in 1996 reflected how a strong positive feedback between sedimentary dynamics and riparian vegetation succession resulted in the construction of the vegetated bars. A highly significant statistical association of geomorphological and vegetation variables (RV of co‐inertia analysis = 0.41, p < 0.001) explained 95% of the variability in just one axis, supporting the existence of very strong feedback between geomorphological changes (i.e. the transformation of small bare alternate bars to fluvial landforms covered by mature upland forest, and vegetation succession). Such dynamics reflect the fluvial biogeomorphological successions model, as described by the authors earlier. © 2020 John Wiley & Sons, Ltd.

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“…Only a small number of numerical studies predicted the vegetation flow in meandering channels while accounting for the 3-dimensional (3D) flow characteristics, especially the secondary flow. Most researchers achieved vegetation-hydraulics-morphology interactions by using 2-dimensional (2D) numerical models, focusing on distinctive factors, such as the VP evolution (Jourdain et al, 2020), geomorphology development (Bywater-Reyes et al, 2018, Crosato and Saleh, 2011, Wu et al, 2005, channel bed strengthening by roots (Caponi and Siviglia, 2018), seasonal floods (Kang et al, 2018) as well as bank stability (Asahi et al, 2013, Eke et al, 2014.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the influence of curvature ratio and vegetation density on a partially vegetated U-bend channel flow

Wang

Avital

Korakianitis³

et al. 2021

Advances in Water Resources

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The influence of a vegetated bar on channel-bend flow dynamics

Cited by 12 publications

References 53 publications

Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study

Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study

Formation and dynamics of vegetated fluvial landforms follow the biogeomorphological succession model in a channelized river

A numerical study on the influence of curvature ratio and vegetation density on a partially vegetated U-bend channel flow

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