Journal ArticleDOI
Numerical study on the effects of floodplain vegetation on river planform style
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In this paper, the effects of floodplain vegetation on river planform have been investigated for a medium-sized river using a 2D morphodynamic model with submodels for flow resistance and plant colonization.Abstract:
The effects of floodplain vegetation on river planform have been investigated for a medium-sized river using a 2D morphodynamic model with submodels for flow resistance and plant colonization. The flow resistance was divided into a resistance exerted by the soil and a resistance exerted by the plants. In this way it was possible to reproduce both the decrease in bed shear stress, reducing the sediment transport capacity of the flow within the plants, and the increase in hydraulic resistance, reducing the flow velocities. Colonization by plants was obtained by instantaneously assigning vegetation to the areas that became dry at low water stages. This colonization presents a step forward in the modelling of bank accretion. Bank erosion was related to bed degradation at adjacent wet cells. Bank advance and retreat were reproduced as drying and wetting of the computational cells at the channel margins. The model was applied to a hypothetical case with the same characteristics as the Allier River (France). The river was allowed to develop its own geometry starting from a straight, uniform, channel. Different vegetation densities produced different planforms. With bare floodplains, the river always developed a braided planform, even if the discharge was constant and below bankfull. With the highest vegetation density (grass) the flow concentrated in a single channel and formed incipient meanders. Lower vegetation density (pioneer vegetation) led to a transitional planform, with a low degree of braiding and distinguishable incipient meanders. The results comply with flume experiments and field observations reported in the literature.read more
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Journal ArticleDOI
Plants as river system engineers
TL;DR: In this paper, the authors acknowledge three research grants/contracts that are supporting their current research on this theme: Grant F/07 040/AP from the Leverhulme Trust, Grant NE/F014597/1 from the Natural Environment Research Council, UK, and the this paperORM collaborative project funded by the European Union Seventh Framework Programme under grant agreement 282656.
Journal ArticleDOI
Changing river channels: the roles of hydrological processes, plants and pioneer fluvial landforms in humid temperate, mixed load, gravel bed rivers.
TL;DR: In this paper, the authors investigate how vegetation dynamics across river margins are governed by hydrological processes that can both promote riparian vegetation growth and disturb and destroy riparian and aquatic vegetation.
Journal ArticleDOI
Modeling the interactions between river morphodynamics and riparian vegetation
TL;DR: A review of the main interactions between rivers and riparian vegetation, and their possible modeling can be found in this paper, where both semiquantitative and quantitative models have been proposed to date, considering both multi-and single-thread rivers.
Journal ArticleDOI
Effects of vegetation on flow and sediment transport: comparative analyses and validation of predicting models
TL;DR: In this article, the authors compared the performance of a large number of models on flow resistance, vegetation drag, vertical velocity profiles and bed-shear stresses in vegetated channels.
Journal ArticleDOI
Physics‐based modeling of large braided sand‐bed rivers: Bar pattern formation, dynamics, and sensitivity
TL;DR: In this paper, a physics-based morphological model for sand-bed braided rivers has been proposed to reproduce morphology and dynamics characteristic of braided river and determine the model sensitivity to generally used constitutive relations for flow and sediment transport.
References
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Journal ArticleDOI
Fluvial Processes in Geomorphology
Formulas for Bed-Load transport
E. Meyer-Peter,R. Müller +1 more
TL;DR: In this article, an attempt is made to derive an empirical law of bed-load transport based on recent experimental data and the results and interpretation of tests already made known in former publications of the Laboratory for Hydraulic Research and Soil Mechanics at the Federal Institute of Technology, Zurich.
Book
Fluvial Processes in Geomorphology
TL;DR: Fluvial processes in geomorphology, Fluvial Processes in Geomorphology as discussed by the authors, fluvial processes and geomorphological processes in the field of geology.
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