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

scholarly journals Hidrogeomorfologia em confluência fluvial obtusa, Guarapuava, Paraná

2021 ◽  
Vol 14 (4) ◽  
pp. 2131-2148
Author(s):  
Leandro Redin Vestena ◽  
Alessandro Kominecki
Keyword(s):  
Land Use ◽  
Sediment Transport ◽  
Liquid Mixtures ◽  
Hydraulic Characteristics ◽  
Specific Flow ◽  
River Ecosystems ◽  
River Bed ◽  
River Confluence ◽  
Land Use And Management ◽  
Junction Angle

Solid and liquid mixtures in river courses intensify in areas of river confluence, conditioned mainly by the angular opening of the junction. Knowledge of hydrosedimentological dynamics in bedrock junctions with different angular openings is essential for understanding morphological adjustment at confluences and for supporting actions for the preservation and conservation of river ecosystems. For this reason, this article presents the results of a hydrogeomorphologic study on a river confluence with an obtuse junction angle (>100º), in a plateau bedrock river, in the Serra Geral Formation. The research evaluated a fluvial segment upstream and downstream of the Pedras River and in the Pombas River tributary, in Guarapuava, Paraná, through observations and measurements of morphological and hydraulic characteristics, width, talweg depth, bed declivity and bankfull flow. Morphological adjustment in obtuse confluences is peculiar in that the fluvial junction angle conditions specific flow, erosion, sediment transport and deposition dynamics, mainly resulting from its association with the geological nature of the river bed and types of land use and management upstream of the confluence.

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
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