The systematic out-branching (Dragon style) rivers under the perspective of connection between river morphology and ecology

Song, Xiaolong; Xu, Haijue; Xu, Haijue

doi:10.1016/j.ecohyd.2022.05.003

Cited by 6 publications

(9 citation statements)

References 31 publications

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“…5e). In the Lolium-perenne vegetation scenario, the introverted branching pattern (Song et al, 2022) was still dominated in the evolution process of channel planform (Fig. 6a), similar to the Festuca-elata vegetation scenario.…”

Section: Channel Planform Changesmentioning

confidence: 62%

“…4b). With the increasing of discharge, a dendric pattern of outer bank splay occurred on the floodplain (x=1.0~1.2m) to act as the incipient outwardbranching channels (Song et al, 2022) and a series of downstream scrolled bars developed gradually instead of obvious points bars on the inner banks of bends in phase-2 (Fig. 4c).…”

Section: Channel Planform Changesmentioning

confidence: 99%

“…The near-river biotic community, riparian vegetation, plays an important role in regulating the morphological development of a river, through physically bank strengthening (Crosato & Saleh, 2011;Gran & Paola, 2001;Parker et al, 2011;Song & Bai, 2015;Tal & Paola, 2007;van Dijk, Teske, et al, 2013) and biologically system energizing (Song et al, 2022;Zalewski, 2013Zalewski, , 2015. Mature riparian vegetation is able to promote the concentration of channel flow, the maintenance of meandering channel pattern, and the overall forward evolution in the systematic out-branching form induced by stochastic event processes (Song et al, 2022). While undeveloped and loosely distributed vegetation may lead to the delay of point-bar accretion following the outer bank retreat and result in the aggravation of multi-thread transitioning (Kyuka et al, 2021) within the smoothly and simply external bank-lines.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Riparian Vegetation on the Evolution of an Experimental Meandering Channel Downstream a Scour Pit

Song¹,

Xu²,

Bai³

2023

Preprint

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We conducted the meander evolution experiments incorporating the effects of riparian vegetation and the series of upper vortex flow disturbances induced by a scour pit simultaneously. Two employed nonlegume plants with salinity and alkalinity resistance, had uniform degrees of seedling normal growth and different lengths of root networks. Our results show that riparian vegetation in general can consolidate the single-thread channel planform without branching outward under the flooding flow conditions. Transverse point bars on inner banks were instead by downstream scroll bars in overall channel for long, unless the coupling of riparian vegetation and flood scour. Shallow-rooted plant was inadequate to resist the inner-bank cutting effect brought by the upper vortex flow. Deep-rooted plant can stabilize the bank-lines and thalweg significantly, but that was susceptible to locally low vegetation coverage. Using evolutionary spectral analysis based on thalweg, we found streamwise high-frequency distribution of bed topography mainly concentrated downstream the bifurcation interface in unvegetated scenario when faced with a flood, shrank to the upper isolated turning interface in shallow-rooted scenario, and conversely stood out along the bare roots disturbed region in deep-rooted scenario. This experimental study expands a much wider understanding of vegetation effects in hydro-bio-geomorphological systems engineering.

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Section: Channel Planform Changesmentioning

confidence: 62%

Section: Channel Planform Changesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Riparian Vegetation on the Evolution of an Experimental Meandering Channel Downstream a Scour Pit

Song¹,

Xu²,

Bai³

2023

Preprint

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“…The near-river biotic community, especially riparian vegetation, plays an important role in regulating a river's morphological development through physical bank strengthening (Crosato & Saleh, 2011;Gran & Paola, 2001;Parker et al, 2011;Song & Bai, 2015;Tal & Paola, 2007; and biological system energizing (Song, Xu, & Bai, 2022;Zalewski, 2013Zalewski, , 2015. Mature riparian vegetation can promote channel flow concentration, meandering channel pattern maintenance and even overall forward evolution in the systematically outward branching form induced by stochastic event processes (e.g., stochastic bank collapse) (Song, Xu, & Bai, 2022). Whereas, undeveloped and sparsely distributed vegetation may cause a delay in point-bar accretion following outer bank retreat and the exacerbation of multithread transition (Kyuka et al, 2021) within the externally smooth and simple bank-lines (Song, Xu, & Bai, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The near‐river biotic community, especially riparian vegetation, plays an important role in regulating a river's morphological development through physical bank strengthening (Crosato & Saleh, 2011; Gran & Paola, 2001; Parker et al, 2011; Song & Bai, 2015; Tal & Paola, 2007; van Dijk et al, 2013) and biological system energizing (Song, Xu, & Bai, 2022; Zalewski, 2013, 2015). Mature riparian vegetation can promote channel flow concentration, meandering channel pattern maintenance and even overall forward evolution in the systematically outward branching form induced by stochastic event processes (e.g., stochastic bank collapse) (Song, Xu, & Bai, 2022). Whereas, undeveloped and sparsely distributed vegetation may cause a delay in point‐bar accretion following outer bank retreat and the exacerbation of multithread transition (Kyuka et al, 2021) within the externally smooth and simple bank‐lines (Song, Xu, & Bai, 2022).…”

Section: Introductionmentioning

confidence: 99%

Riparian vegetation's effects on the evolution of an experimental meandering channel driven by an upper vortex flow

Song

Wang

et al. 2023

Earth Surf Processes Landf

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Few investigations of river evolution have incorporated the series of upper vortex flow disturbances induced by quasi‐knickpoints, and it is unclear whether the regulating ability of riparian vegetation in maintaining meandering channel patterns is valid. In this study, we therefore conducted meander evolution experiments to confirm the effects of vegetation species and vegetation strength on this complex system. Two nonleguminous plants with salinity and alkalinity resistance had non‐uniform degrees of normal seedling growth and different root network lengths. Our findings show that braided swales formed between the upstream developing zone of the vortex flow and the nearest bend and the riparian vegetation generally consolidated the single‐thread channel planform without branching outward under the conditions of flooding flow. Transverse point bars on inner banks were replaced by downstream scroll bars in the overall channel for long time, unless riparian vegetation and flood scour were coupled. Shallow‐rooted plants were inadequate to withstand the inner‐banks being cut by the upper vortex flow. Deep‐rooted plants can significantly stabilize bank lines and thalwegs but are vulnerable to locally low vegetation coverage. Using evolutionary spectral analysis based on thalwegs, we found that the streamwise high‐frequency distribution of bed topography was primarily concentrated downstream of the bifurcation interface when a flood was present in the unvegetated scenario, shrank to the isolated turning interface of the upper reach and the large‐scale spiral swale of the lower reach in the shallow‐rooted scenario and stood out along the area disturbed by bare roots in the deep‐rooted scenario. This experimental study broadens our understanding of vegetation effects in hydro‐bio‐geomorphological system engineering.

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Long-term evolution of meandering channel planforms in response to the mean annual flow and width–depth ratio

Song,

Xu,

Bai

2023

International Journal of Sediment Research

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The systematic out-branching (Dragon style) rivers under the perspective of connection between river morphology and ecology

Cited by 6 publications

References 31 publications

Effects of Riparian Vegetation on the Evolution of an Experimental Meandering Channel Downstream a Scour Pit

Effects of Riparian Vegetation on the Evolution of an Experimental Meandering Channel Downstream a Scour Pit

Riparian vegetation's effects on the evolution of an experimental meandering channel driven by an upper vortex flow

Long-term evolution of meandering channel planforms in response to the mean annual flow and width–depth ratio

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