الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The growing tourism investments and urban developments at the coastal regions increased the demand on desalinated seawater, especially in the light of fresh water shortage. For the majority of Arab countries, wa-ter desalination became a necessary sector. The number and capacity of desalination units have expanded considerably in the previous decades, particularly in the Gulf States. One of the main stages of desalination is selecting a proper method to dispose undesired brine, which is a by-product from the plant, in a safe and economic manner to ensure the suc-cess and continuity of the desalination process. One of the widely used methods of desalination brine disposal nowadays is using deep injection wells. The construction cost of these wells is relatively high. So the deci-sion of using this method and its success in disposing the entire capacity of brine from desalination plants must be precisely studied prior to well construction in the early planning stages to assess the feasibility of injec-tion.
This thesis investigates the problem of pressurized injection of desali-nation brine into deep aquifers by conducting a numerical modeling ap-proach using SEEP/W software in order to simulate the pressure-discharge relationship in the injection well. The model is then validated using ob-served data from in-situ injection test that was conducted in a coastal area at Zafarana region near the western coast of the Gulf of Suez in Egypt.
The results showed that the model could fairly explain the pressure-discharge relation into the injection well. The validated model was also used to determine the effects of well design parameters on the desalination brine injection capacity. These parameters are the pressure of injection, soil hydraulic conductivity, aquifer thickness, screen length, and well diameter. Our initial assessment of the modeling approach indicates that the developed approach constitutes a valuable tool for the planning and as-sessment of deep injection wells, this is important to assess and determine the injection feasibility early prior to well construction.
Finally, the thesis developed multiple design charts that can help en-gineers in determining the brine injection capacity of wells. The injection capacity is represented in terms of the well design parameters. The study also introduced a non-linear regression model (power equation) that can be used as an alternative to the design charts.