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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : High resolution 3d model of desalination brine spreading: test cases and field case el-gouna, egypt
High resolution 3d model of desalination brine spreading: test cases and field case el-gouna, egypt
Author : M. SHEHATA (1), M. MAHGOUB (2) & R. HINKELMANN (3)
ABSTRACT
Water scarcity has become a big issue in many parts of the world. For Egypt, water security is now one of the main
concerns because the increasing water demand is stressing the existing water resources. Therefore, finding new sources
of fresh water is essential in facing this challenge. Currently, sea water desalination is one of the promising alternatives.
However, discharging the resulting brine concentrate back to the sea could cause severe damage to the marine
environment, especially if the ecosystem is sensitive like the case of the Red Sea.
In this research, numerical modeling was used to investigate the propagation and spreading of the desalination brine after
being discharged to the sea. TELEMAC-3D modeling system was used to build 3D models of the brine propagation under
different scenarios. Based on experience of similar previous work, the version using non-hydrostatic pressure distribution
was chosen and the impact of different turbulence models was analyzed. Firstly, academic test cases were setup to
examine different numerical and physical parameters and conditions in order to understand their degree of influence over
the brine plume propagation. These parameters and conditions include the bed characteristics, outlet configuration, brine
salinity and the water velocity. Then, a 3D model for a field case representing El-Gouna Region on the Red Sea was
setup, and a study of the influence of the Red sea hydrodynamics on the plume behavior was performed.
The parameters¡¯ study showed that the bed bathymetry (slope and deformations) and the water body hydrodynamics are
the most critical factors. According to the results, the outlet location of a desalination plant should be selected in an area
which is characterized by good mixing conditions. Locations which have steep bed slopes, high velocity field and high
turbulence are favorable, to decrease the plume size and consequently its environmental impact. The 3D model
simulations constructed for El-Gouna region confirmed the previous results and showed that the tidal range in the Red
Sea has minor influence on the brine plume. Velocity fields induced by wind were found to have high influence on the
brine plume, especially if the outlet is located in a relatively shallow area near the coast.
File Size : 2,336,457 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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