Fine sediment transport by tidal asymmetry in the high-concentrated Ems River: indications for a regime shift in response to channel deepening

2010 ◽  
Vol 61 (2-3) ◽  
pp. 203-215 ◽  
Author(s):  
Johan C. Winterwerp
Keyword(s):  
Sediment Transport ◽  
Regime Shift ◽  
Fine Sediment ◽  
Tidal Asymmetry

scholarly journals Theoretical Interpretation of the Exceptional Sediment Transport of Fine-grained Dispersal Systems Associated with Bedform Categories

2018 ◽  
Author(s):  
Tian Zhao ◽  
Qian Yu ◽  
Yunwei Wang ◽  
Shu Gao
Keyword(s):  
Sediment Transport ◽  
Regime Shift ◽  
Sedimentary Environment ◽  
Sediment Flux ◽  
Theoretical Interpretation ◽  
Fine Grained ◽  
Transport Regime ◽  
Source To Sink ◽  
Bed Roughness ◽  
Set Up

Abstract. Being a widespread source-to-sink sedimentary environment, the fine-grained dispersal system (FGDS) features remarkably high sediment flux, interacting closely with local morphology and ecosystem. Such exceptional transport is believed to be associated with changes in bedform geometry, which further demands theoretical interpretation. Using van Rijn (2007a) bed roughness predictor, we set up a simple numerical model to calculate sediment transport, classify sediment transport behaviors into dune and (mega-)ripple dominant regimes, and discuss the causes of the sediment transport regime shift linked with bedform categories. Both regimes show internally consistent transport behaviors, and the latter, associated with FGDSs, exhibits considerably higher sediment transport rate than the previous. Between lies the coexistence zone, the sediment transport regime shift accompanied by degeneration of dune roughness, which can considerably reinforce sediment transport and is further highlighted under greater water depth. This study can be applied to modeling of sediment transport and morphodynamics.

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>

On fine sediment transport by a flood surge

2005 ◽  
Vol 543 (-1) ◽  
pp. 239 ◽  
Author(s):  
DAVID PRITCHARD
Keyword(s):  
Sediment Transport ◽  
Fine Sediment

scholarly journals ROLES OF FLOODS AND FINE SEDIMENT TRANSPORT TO WOOD LAND EXPANSION ON A GRAVEL RIVER-BED

1998 ◽  
Vol 42 ◽  
pp. 433-438 ◽  
Author(s):  
Sam-hee LEE ◽  
Koh-ichi FUJITA ◽  
Takao TSUKAHARA ◽  
Satoshi WATANABE ◽  
Koichi YAMAMOTO ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Fine Sediment ◽  
River Bed
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