scholarly journals Role of grain dynamics in determining the onset of sediment transport

2017 ◽  
Vol 2 (3) ◽  
Author(s):  
Abram H. Clark ◽  
Mark D. Shattuck ◽  
Nicholas T. Ouellette ◽  
Corey S. O'Hern
Keyword(s):  
Sediment Transport ◽  
Grain Dynamics

Hydro-morphodynamic modelling of floodplains: the role of vegetation in suspended sediment transport

2020 ◽  
Author(s):  
Daniel A. S. Conde ◽  
Robert M. Boes ◽  
David F. Vetsch
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Flow Resistance ◽  
Laboratory Data ◽  
Anthropogenic Factors ◽  
Future Research ◽  
Suspended Sediment Transport ◽  
Compound Channels ◽  
Closure Models

<p>Riverine environments are amongst the most complex ecosystems on the planet. As several anthropogenic factors have increasingly disrupted the natural dynamics of rivers, namely through stream regulation, the need for re-establishing the ecological role of these systems has gained relevance.</p><p>Of particular interest are floodplains in compound channels, primarily regarded for safety against floods, but which also comprise an extensive realm for ecological functions and establishment of various species. Floodplain vegetation affects flow resistance and dispersion, playing a fundamental role in erosion and deposition of suspended sediment.</p><p>The present work aims at quantifying the interaction between vegetation and suspended sediment transport on floodplains in compound channels by numerical simulations. The employed numerical tool is BASEMENT v3, a GPU-accelerated hydro-morphodynamic 2D model developed at the Laboratory of Hydraulics, Hydrology and Glaciology of ETH Zurich. In the context of the present study, the model is extended with turbulence and suspended sediment transport capabilities. The implemented closure models for turbulence pertain to three major groups, namely (i) mixing-length, (ii) production-dissipation and (iii) algebraic stress models. For suspended sediment transport, the main classical formulations from fluvial hydraulics were implemented in the numerical model.</p><p>Laboratory data from flume experiments featuring suspended sediment load and vegetation-like proxies are used for model validation. The numerical results are compared with the observed water depths, velocities and sediment concentrations for different sets of experiments with varying properties, such as density and submergence. The implemented closure models for flow resistance, turbulence and suspended sediment are then combined, calibrated and classified in terms of numerical output quality.</p><p>The obtained results from this modelling effort mainly contribute to understanding the applicability of 2D (depth-averaged) models to complex eco-morphodynamics scenarios. The calibration and rating of well-known closure models for turbulence and sediment transport provides relevant guidelines for both future research and practice in fluvial modelling.</p>

Numerical Evaluation of the Role of Runon on Sediment Transport over Heterogeneous Hillslopes

2008 ◽  
Vol 13 (4) ◽  
pp. 215-225 ◽  
Author(s):  
N. Nahar ◽  
Rao S. Govindaraju ◽  
Corrado Corradini ◽  
Renato Morbielli
Keyword(s):  
Sediment Transport ◽  
Numerical Evaluation

The role of kelp in sediment transport: Observations from southeast New Zealand

2011 ◽  
Vol 281 (1-4) ◽  
pp. 35-42 ◽  
Author(s):  
Christopher J. Garden ◽  
Abigail M. Smith
Keyword(s):  
New Zealand ◽  
Sediment Transport

scholarly journals How Sediment Transport Sways Wetland Stability

Eos ◽  
2016 ◽  
Vol 97 ◽  
Author(s):  
Lily Strelich
Keyword(s):  
Sediment Transport ◽  
Sea Level Rise ◽  
Suspended Sediment ◽  
Sea Level ◽  
Coastal Wetlands ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration

Scientists examine the role of variables like tides and suspended sediment concentration to improve methods of evaluating coastal wetlands and how they may respond to future sea level rise.

On the Role of Fine Sediment Behaviour in Pollutant Transfer Modelling

1988 ◽  
Vol 20 (6-7) ◽  
pp. 175-182
Author(s):  
W. R. Parker
Keyword(s):  
Sediment Transport ◽  
Model Calibration ◽  
Fine Sediment ◽  
Transport Cycle ◽  
Available Technology ◽  
Kinetics Of ◽  
Pollutant Transfer ◽  
Dissolved Phase ◽  
Sorbed Phase

The role played by fine cohesive sediment in the transport and recycling of pollutants arises from the often reversible partition of pollutants between the dissolved phase and surface sorbed phase. Adequate prediction requires that a realistic understanding of the physical behaviour of the fine sediment population of an area is coupled with the kinetics of the sorbtion/desorbtion equilibria at crucial stages in the fine sediment transport cycle. This paper examines the physical basis underlying the prediction of fine sediment transport, identifying processes and phenomena which are important in affecting predictions. Parameterisation of source and sink terms are seen to be areas of great uncertainty and model calibration requires the deployment of new, but available, technology.

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