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Modeling sediment deposition from marine outfall jets.

Abdelali Terfous¹, Samia Chiban^1,2, Abdellah Ghenaim¹

¹a Fluid Mechanics, ICUBE Laboratory , INSA Strasbourg Graduate School of Science and Technology , Strasbourg , France.

Environmental Technology

|January 7, 2016

Summary

A new two-dimensional model simulates sediment deposition from marine outfall jets. The model accurately predicts sediment settling based on entrainment and settling velocities, validated by experimental data.

Keywords:

Turbulent flow deposition marine outfall jets mathematical models suspended sediment

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Area of Science:

Environmental Engineering
Fluid Dynamics
Sediment Transport

Background:

Marine outfall jets are crucial for wastewater discharge.
Understanding sediment deposition is vital for environmental impact assessment.
Existing models may not fully capture complex fluid-sediment interactions.

Purpose of the Study:

To develop and validate a two-dimensional model for sediment deposition from marine outfall jets.
To investigate the influence of fluid-sediment coupling in low-concentration particle-laden jets.
To establish a deposition criterion based on entrainment and settling velocities.

Main Methods:

A unidirectional fluid-sediment coupling model was employed.
The model incorporates the preferential concentration phenomenon.
Sediment deposition is governed by an ordinary differential equation coupled with liquid phase equations.

Main Results:

The model accurately predicts sediment deposition based on entrainment and settling velocities.
Simulations showed good agreement with experimental data for various jet configurations.
The deposition process is influenced by settling velocity, entrainment velocity, volume flux, and sediment concentration.

Conclusions:

The developed two-dimensional model effectively simulates sediment deposition from marine outfall jets.
The unidirectional coupling approach is suitable for low-concentration particle-laden jets.
The model provides a reliable tool for predicting sediment transport and deposition in marine environments.