Reciprocal interactions and adjustments between fluvial landforms and vegetation dynamics in river corridors: A review of complementary approaches

Corenblit, Dov Jean-François; Tabacchi, Eric; Steiger, Johannes; Gurnell, Angela M.

doi:10.1016/j.earscirev.2007.05.004

Cited by 606 publications

(664 citation statements)

References 199 publications

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“…However, assessing annual (short-term) rates is important for understanding the more dynamic relationships between sedimentation and the biodiversity of riparian zones . The cumulative contribution of short-and long-term deposition rates may produce a legacy effect with immediate short-term implications for riparian vegetation and eventual long-term impacts on both vegetation and propagule banks (Corenblit et al 2007). Although riparian zones are inherently dynamic, the imposition of multiple stressors, such as invasion by IAPs and increased sediment deposition, associated with land-use change and climate-related changes in flow, may lower community stability or affect long term resilience.…”

Section: Introductionmentioning

confidence: 99%

Invasion legacy effects versus sediment deposition as drivers of riparian vegetation

2017

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Riparian zones are formed by interactions between fluvio-geomorphological processes, such as sediment deposition, and biota, such as vegetation. Establishment of invasive alien plant (IAP) species along rivers may influence vegetation dynamics, evidenced as higher seasonal or inter-annual fluctuations in native plant diversity when IAP cover is high. This could impact the overall functioning of riparian ecosystems. Conversely, fine sediment deposited in riparian zones after floods may replenish propagule banks, thus supporting recruitment of native species. The interactive effects of invasion and fine sediment deposition have hitherto, however, been ignored. Vegetation surveys across rivers varying in flow regime were carried out over 2 years to assess changes in community composition and diversity. Artificial turf mats were used to quantify over-winter sediment deposition. The viable propagule bank in soil and freshly deposited sediment was then quantified by germination trials. Structural Equation Models were used to assess causal pathways between environmental variables, IAPs and native vegetation. Greater variation in flow increased the cover of IAPs along riverbanks. An increased in high flow events and sediment deposition were positively associated with the diversity of propagules deposited. However, greater diversity of propagules did not result in a more diverse plant community at invaded sites, as greater cover of IAPs in summer reduced native plant diversity. Seasonal turnover in the above-ground vegetation was also accentuated at previously invaded sites, suggesting that a legacy of increased competition in previous years, not recent sediment deposition, drives above-ground vegetation structure at invaded sites. The interaction between fluvial disturbance via sediment deposition and invasion pressure is of growing importance in the management of riparian habitats. Our results suggest that invasion can uncouple the processes that contribute to resilience in dynamic habitats making already invaded habitats vulnerable to further invasions.

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Section: Introductionmentioning

confidence: 99%

Invasion legacy effects versus sediment deposition as drivers of riparian vegetation

2017

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“…As shown elsewhere, bar morphodynamics vary markedly for differing planform types, with key differences outlined here for braided, anabranching, and meandering channels (cf., Hooke, 1986;Kleinhans, 2010;Kleinhans and van den Berg, 2010;Church and Ferguson, 2015). Bar development and stability reflect the ability of vegetation to trap sediments and stabilize banks, which in turn is directly influenced by flow energy relationships (i.e., these are mutual adjustments; Corenblit et al, 2007;Gurnell et al, 2012;Gurnell, 2014;Osterkamp and Hupp, 2010;Pietsch and Nanson, 2011). In this study, riparian vegetation and its root network are considered to restrict channel width and increase hydraulic efficiency, inducing greater bedload transport capacity in multi-thread channels (Allmendinger et al, 2005;Huang and Nanson, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Vegetation encroachment by pioneer species and successional processes induce abiotic and biotic transitions in geomorphic processes from the unvegetated channel bed and bar surfaces to grassland, shrubs, and treed areas at the margins of bars/islands and on floodplains (Corenblit et al, 2007(Corenblit et al, , 2011Gurnell, 2014;Hickin, 1984;Hupp and Osterkamp, 1996;Millar, 2000;Tooth and Nanson, 2000). Vegetation attributes influence the pattern of roughness elements and the associated distribution of flow energy, thereby affecting the distribution of erosional and depositional processes, and resulting morphological attributes (including the grain size distribution of bed/bar materials).…”

Section: Introductionmentioning

confidence: 99%

Vegetative impacts upon bedload transport capacity and channel stability for differing alluvial planforms in the Yellow River source zone

Brierley

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. The influence of vegetation upon bedload transport and channel morphodynamics is examined along a channel stability gradient ranging from meandering to anabranching to anabranching-braided to fully braided planform conditions along trunk and tributary reaches of the Upper Yellow River in western China. Although the regional geology and climate are relatively consistent across the study area, there is a distinct gradient in the presence and abundance of riparian vegetation for these reaches atop the QinghaiTibet Plateau (elevations in the study area range from 2800 to 3400 m a.s.l.). To date, the influence of vegetative impacts upon channel planform and bedload transport capacity of alluvial reaches of the Upper Yellow River remains unclear because of a lack of hydrological and field data. In this region, the types and pattern of riparian vegetation vary with planform type as follows: trees exert the strongest influence in the anabranching reach, the meandering reach flows through meadow vegetation, the anabranching-braided reach has a grass, herb, and sparse shrub cover, and the braided reach has no riparian vegetation. A non-linear relation between vegetative cover on the valley floor and bedload transport capacity is evident, wherein bedload transport capacity is the highest for the anabranching reach, roughly followed by the anabranching-braided, braided, and meandering reaches. The relationship between the bedload transport capacity of a reach and sediment supply from upstream exerts a significant influence upon channel stability. Bedload transport capacity during the flood season (June-September) in the braided reach is much less than the rate of sediment supply, inducing bed aggradation and dynamic channel adjustments. Rates of channel adjustment are less pronounced for the anabranching-braided and anabranching reaches, while the meandering reach is relatively stable (i.e., this is a passive meandering reach).

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“…Recently, Corenblit et al (2007) introduced a "fluvial biogeomorphic succession" concept, coupling landform and riparian vegetation evolution in bi-directional modelling.…”

Section: Sustainability River Management Model Considerationsmentioning

confidence: 99%

River, delta and coastal morphological response accounting for biological dynamics

Goldsmith¹,

Bernardi

Schippa

2015

Proc. IAHS

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Management and construction can increase resilience in the face of climate change, and benefits can be enhanced through integration of biogenic materials including shells and vegetation. Rivers and coastal landforms are dynamic systems that respond to intentional and unintended manipulation of critical factors, often with unforeseen and/or undesirable resulting effects. River management strategies have impacts that include deltas and coastal areas which are increasingly vulnerable to climate change with reference to sea level rise and storm intensity. Whereas conventional assessment and analysis of rivers and coasts has relied on modelling of hydrology, hydraulics and sediment transport, incorporating additional biological factors can offer more comprehensive, beneficial and realistic alternatives. Suitable modelling tools can provide improved decision support. The question has been whether current models can effectively address biological responses with suitable reliability and efficiency. Since morphodynamic evolution exhibits its effects on a large timescale, the choice of mathematical model is not trivial and depends upon the availability of data, as well as the spatial extent, timelines and computation effort desired. The ultimate goal of the work is to set up a conveniently simplified river morphodynamic model, coupled with a biological dynamics plant population model able to predict the long-term evolution of large alluvial river systems managed through bioengineering. This paper presents the first step of the work related to the application of the model accounting for stationary vegetation condition. Sensitivity analysis has been performed on the main hydraulic, sedimentology, and biological parameters. The model has been applied to significant river training in Europe, Asia and North America, and comparative analysis has been used to validate analytical solutions. Data gaps and further areas for investigation are identified.

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Reciprocal interactions and adjustments between fluvial landforms and vegetation dynamics in river corridors: A review of complementary approaches

Cited by 606 publications

References 199 publications

Invasion legacy effects versus sediment deposition as drivers of riparian vegetation

Invasion legacy effects versus sediment deposition as drivers of riparian vegetation

Vegetative impacts upon bedload transport capacity and channel stability for differing alluvial planforms in the Yellow River source zone

River, delta and coastal morphological response accounting for biological dynamics

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