scholarly journals Physical and biological controls on fine sediment transport and storage in rivers

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Martin A. Wilkes ◽  
Joshua R. Gittins ◽  
Kate L. Mathers ◽  
Richard Mason ◽  
Roser Casas‐Mulet ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Fine Sediment ◽  
And Storage

scholarly journals Reintroduced large wood modifies fine sediment transport and storage in a lowland river channel

2017 ◽  
Vol 42 (11) ◽  
pp. 1693-1703 ◽  
Author(s):  
Chris Parker ◽  
Alexander J. Henshaw ◽  
Gemma L. Harvey ◽  
Carl D. Sayer
Keyword(s):  
Sediment Transport ◽  
Fine Sediment ◽  
River Channel ◽  
Lowland River ◽  
Large Wood ◽  
And Storage

Sediment slugs: large-scale fluctuations in fluvial sediment transport rates and storage volumes

1995 ◽  
Vol 19 (4) ◽  
pp. 500-519 ◽  
Author(s):  
A.P. Nicholas ◽  
P.J. Ashworth ◽  
M.J. Kirkby ◽  
M.G. Macklin ◽  
T. Murray
Keyword(s):  
Sediment Transport ◽  
Sediment Supply ◽  
Fluvial Systems ◽  
Event Scale ◽  
Fluvial Sediment ◽  
Sediment Routing ◽  
Basin Scale ◽  
Wide Range ◽  
And Storage ◽  
Fluvial Sediment Transport

Variations in fluvial sediment transport rates and storage volumes have been described previously as sediment waves or pulses. These features have been identified over a wide range of temporal and spatial scales and have been categorized using existing bedform classifications. Here we describe the factors controlling the generation and propagation of what we term sediment slugs. These can be defined as bodies of clastic material associated with disequilibrium conditions in fluvial systems over time periods above the event scale. Slugs range in magnitude from unit bars (Smith, 1974) up to sedimentary features generated by basin-scale sediment supply disturbances (Trimble, 1981). At lower slug magnitudes, perturbations in sediment transport are generated by local riverbank and/or bed erosion. Larger-scale features result from the occurrence of rare high- magnitude geomorphic events, and the impacts on water and sediment production of tectonics, glaciation, climate change and anthropogenic influences. Simple sediment routing functions are presented which may be used to describe the propagation of sediment slugs in fluvial systems. Attention is drawn to components of the fluvial system where future research is urgently required to improve our quantitative understanding of drainage-basin sediment dynamics.

Internal tides as a major process in Amazon continental shelf fine sediment transport

2020 ◽  
Vol 430 ◽  
pp. 106360
Author(s):  
Ernesto Molinas ◽  
Juliane Castro Carneiro ◽  
Susana Vinzon
Keyword(s):  
Sediment Transport ◽  
Continental Shelf ◽  
Fine Sediment ◽  
Internal Tides ◽  
Major Process

scholarly journals Some evidences of northward fine sediment transport in the northern portuguese continental shelf

1998 ◽  
Vol 21 (2) ◽  
pp. 223-231 ◽  
Author(s):  
Teresa Drago ◽  
Anabela Oliveira ◽  
Fernando Magalhães ◽  
João Cascalho ◽  
Jean-Marie Jouanneau ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Continental Shelf ◽  
Fine Sediment

3D numerical studies on stratification and mixing processes affecting fine sediment transport in the pre-dam of the Dhünn reservoir in Germany

2020 ◽  
Author(s):  
Wendy Gonzalez ◽  
Irina Klassen ◽  
Anne Jakobs ◽  
Frank Seidel
Keyword(s):  
Sediment Transport ◽  
Input Data ◽  
Measurement Data ◽  
Fine Sediment ◽  
Transport Processes ◽  
Transport Modeling ◽  
Wind Effects ◽  
Sediment Distribution ◽  
Vertical Diffusivity ◽  
The Impact

<p>Fine sediment transport processes and the thermodynamics in reservoirs are key processes governing the water quality of reservoirs. With regard to a sustainable sediment management of reservoirs, the prediction of sediment transport and deposition is becoming increasingly important.</p><p>The subject of the present work was the 3D numerical simulation of fine sediment transport in a reservoir taking into account stratification and mixing effects which in turn are caused by temperature gradients and wind effects. In order to understand and investigate the driving factors for stratification processes and their impact on fine sediment distribution, the great pre-dam of the Dhünn reservoir in Germany served as case study. The investigations were conducted in sensitivity analyses adopting a 3D sediment transport model with Delft 3D. The impact of various physical and numerical parameters on temperature and fine sediment transport modeling was examined: the number of vertical layers, the input data for the heat model (e.g. relative humidity, air temperature, cloud coverage, solar radiation), the vertical diffusivity and wind effects. The sensitivity studies showed that the input data for the heat model have a minor impact on the temperature and sediment transport modeling within the tested range of parameters. However, the vertical diffusivity and especially the inclusion of wind showed a greater influence on the simulated temperature and suspended sediment concentration gradients. The temperature modeling results by inclusion/exclusion of wind were qualitatively compared with temperature data from literature and with measurement data over a period of one month. Hereby, the simulations showed a good agreement with measurement data by exclusion of wind effects.</p><p>The results of the studies provide a solid basis for the development of further models in fields where fine sediment transport is affected by stratification processes and can also be very useful in terms of a better understanding of the interactions between temperature, wind and fine sediment transport.</p>

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