scholarly journals Flow Distribution and Sediment Transport Mechanism in the Estuarine Systems of Ganges-Brahmaputra-Meghna Delta

2016 ◽  
Vol 7 (1) ◽  
pp. 22-30 ◽  
Author(s):  
Anisul Haque ◽  
◽  
Sumaiya ◽  
Munsur Rahman ◽  
◽  
...  
Keyword(s):  
Sediment Transport ◽  
Transport Mechanism ◽  
Flow Distribution ◽  
Estuarine Systems

Numerical modelling of sediment transport in a channel bend with floating units

2021 ◽  
Author(s):  
Diwash Lal Maskey ◽  
Nils Ruther
Keyword(s):  
Transport Phenomenon ◽  
Sediment Transport ◽  
Numerical Modelling ◽  
Velocity Distribution ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Deposition Pattern ◽  
Bed Deformation ◽  
Channel Bend ◽  
Conceptual Study

<p>Floating units/booms are used to trap or guide floating debris in watercourses. In a relatively shallow depth, these floats could affect the velocity distribution, sediment transport and channel bed deformation.  A three-dimensional non-hydrostatic numerical modelling was performed in a 180 degree channel bend with floats to see the effects in flow distribution and bed deformation as a conceptual study. Different configurations of the floats were simulated. The results showed that the flow velocity increased and deposition decreased at the inner bank of the bend. Use of floating units could be studied to alter sediment deposition pattern and sediment transport phenomenon in watercourses.</p>

scholarly journals The Properties of Sediment Transport Mechanism in River Mouth of Rupat Strait

2020 ◽  
Author(s):  
Mubarak Mubarak ◽  
Rifardi Rifardi ◽  
Ahmad Nurhuda ◽  
Albert Sulaiman
Keyword(s):  
Sediment Transport ◽  
Transport Mechanism ◽  
High Tide ◽  
River Mouth ◽  
Ocean Current ◽  
Anthropogenic Factors ◽  
Explicit Method ◽  
Transport Modelling ◽  
Sediment Transport Modelling ◽  
Malacca Strait

The Rupat Strait, a part of the Malacca Strait, is recognized as semi-closed waters and shows a high activity; thus, discovering the transport sediment mechanism of the strait as a consequence of ambient and anthropogenic forces is essential. Hydrodynamic and sediment transport modelling was constructed using the 2-Dimensional Explicit method which is averaged over depth. The results show that the dispersion of sediment at high tide is longer than that at low tide. This follows the hydrodynamic model in which current velocity at high tide is greater than the ocean current at the low tide. The previous sediment observation supports the results of transport sediment modelling, indicating that the anthropogenic factors are highly associated with the sedimentation in the Rupat strait

scholarly journals TRANSPORT OF NILE SAND ALONG THE SOUTHEASTERN MEDITERRANEAN COAST

1984 ◽  
Vol 1 (19) ◽  
pp. 87
Author(s):  
Zev Carmel ◽  
Douglas L. Inman ◽  
Abraham Golik
Keyword(s):  
Sediment Transport ◽  
Transport Mechanism ◽  
Nile Delta ◽  
Mediterranean Coast ◽  
Longshore Sediment Transport ◽  
Transport Path ◽  
Directional Wave ◽  
Wave Induced ◽  
Annual Transport ◽  
Good Agreement

The potential for longshore sediment transport (LST) is estimated from a three-year set of directional wave data measured off Haifa, Israel. The resulting annual cycle of LST, together with an analysis of the wave and shore characteristics, suggests a wave-induced sediment transport mechanism with a uni-directional annual transport that gradually decreases along the transport path from the source (Nile delta) to sink (Haifa Bay). Existing estimates of the rates of transport of Nile sediment are in good agreement with this result.

Numerical simulation of sediment transport in a U-shaped channel with lateral intake: Effects of intake position and diversion angle

2019 ◽  
Vol 30 (09) ◽  
pp. 1950071 ◽  
Author(s):  
Keivan Tavakoli ◽  
Hossien Montaseri ◽  
Pourya Omidvar ◽  
Stefania Evangelista
Keyword(s):  
Sediment Transport ◽  
Numerical Model ◽  
Transport Mechanism ◽  
Discrete Phase Model ◽  
Reference Time ◽  
Bed Topography ◽  
Discharge Ratio ◽  
Discrete Phase ◽  
Sediment Particles ◽  
Good Agreement

In this work, the mechanism of sediment transport in a U-shaped channel with a lateral intake is investigated experimentally and numerically, together with the processes of sediment entry into the intake itself and formation of bed topography. Dry sediment is injected into a steady flow in a rigid channel with a bend and sediment particles are traced in time. In order to validate the numerical model, the three components of the flow velocity, as well as the sediment path in time and the diverted sediment ratios, are measured experimentally. A numerical Discrete Phase Model (DPM) is then applied to study the effect of the intake position and diversion angle on the sediment transport mechanism in the bend. The DPM has, in fact, the capability of specifying for each particle its position relative to a reference time and space and, thereby, it is used in this study to analyze the phenomenon evolution and determine the sediment particles diverted into the intake. The comparison between the experimental data and the DPM numerical results shows a good agreement. In order to investigate the mechanism of sediment transport and to evaluate the percentage of the diverted sediments, a parametric study is then conducted through the numerical model, with different positions of the outer bend of the channel, diversion angles of the lateral intake and diversion discharge ratios. The results show that the mechanism of sediment entry into the lateral intake is affected by the diversion discharge ratio. For low discharge ratios, the mechanism of sediment entry to the lateral intake only consists of continuous entrance from the upstream edge of the intake. With the increase of the discharge ratio, it consists of a continuous entrance from the downstream edge and a periodic entrance from the upstream edge of the intake. The DPM results show that, for all diversion discharge ratios, the minimum percentage of sediment entered into the lateral intake corresponds to the position of 120∘ and diversion angle equal to 50∘.

scholarly journals Morphodynamics and Evolution of Estuarine Sandspits along the Bight of Benin Coast, West Africa

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 2977
Author(s):  
Stephan Korblah Lawson ◽  
Hitoshi Tanaka ◽  
Keiko Udo ◽  
Nguyen Trong Hiep ◽  
Nguyen Xuan Tinh
Keyword(s):  
Sediment Transport ◽  
West Africa ◽  
Large Scale ◽  
River Mouth ◽  
Storm Surges ◽  
Longshore Sediment Transport ◽  
Standards Of Living ◽  
Estuarine Systems ◽  
Study Sites

It is well known that estuarine systems are significantly affected by hydrodynamic conditions such as river discharge, storm surges, waves and tidal conditions. In addition to this, human interferences through developmental projects have the capability of disrupting the natural morphological processes occurring at estuaries. In West Africa, the goal to improve standards of living through large-scale dam construction, offshore ports and coastal erosion countermeasures has triggered alarming changes in the morphodynamics of estuarine systems. The estuaries at the Volta River mouth (Ghana) and “Bouche du Roi” inlet (Benin), located along the Bight of Benin coast, West Africa, were selected as two case study sites to examine their long-term morphodynamics and sandspit evolution. In this study, we primarily analyzed estuarine morphology using remotely sensed images acquired from 1984 to 2020. We further estimated the longshore sediment transport for this region using results from the image analysis and the depth of active sediment motion. Our results reveal that the longshore sediment transport rates for this region are in the magnitude of 105–106 m3/year. Comparative analysis with other estuaries and sandy coasts suggests that the longshore sediment transport along this coast has one of the largest rates estimated in the world.

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