SURVEY OF PHYSICAL ELEMENTS FOR IDENTIFICATION OF SEDIMENT TRANSPORT MECHANISM

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

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TRANSPORT OF NILE SAND ALONG THE SOUTHEASTERN MEDITERRANEAN COAST

Coastal Engineering Proceedings ◽

10.9753/icce.v19.87 ◽

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.

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Water flux and sediment transport within a forested landscape: the role of connectivity, subsurface flow, and slope length scale on transport mechanism

Hydrological Processes ◽

10.1002/hyp.9791 ◽

2013 ◽

Vol 27 (26) ◽

pp. 4091-4102 ◽

Cited By ~ 6

Author(s):

Afshin Ghahramani ◽

Yoshiharu Ishikawa

Keyword(s):

Sediment Transport ◽

Transport Mechanism ◽

Water Flux ◽

Subsurface Flow ◽

Length Scale ◽

Slope Length

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

International Journal of Modern Physics C ◽

10.1142/s0129183119500712 ◽

2019 ◽

Vol 30 (09) ◽

pp. 1950071 ◽

Cited By ~ 1

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∘.

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