الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
The present study is going to be divided into two parts; the purpose of the first part is to determine numerically, using Finite Element Method (FEM), the behavior of seawaterfreshwater interface subjected to: 1) Recharging (Injection) wells. 2) Pumping wells. 3) Pumping wells in a domain subjected to uniform rainfall percolation. 4) Recharging and pumping wells. 5) Channel and pumping wells. The purpose of the second part is to achieve optimal control of seawater intrusion problem in coastal aquifers. Some coastal aquifers in Egypt are managed under policy of maximizing the rate of pumping. Also, the unconfined coastal aquifer under the Miami Beach in Spain is managed under two different policies. These two policies are: 1) maximizing the gained benefit from selling the extracted fresh water taking into consideration the expenses of the pumping operation, 2) maximizing the allowed rate of the extracted fresh water from the well system without concern to the cost. Also, the optimization technique is applied on a hypothetical heterogeneous aquifer to determine optimal pumping rate from the well system under the desired policy and the effect of heterogeneity on the maximum safe yield through any pumping well system. from the present results, the following points can be achieved: 1) a good background in guessing the response of coastal aquifers under different pumping/recharging well system, 2) good feeling with the effect of different policies that can be used for the purpose of management, and 3) understanding the effect of availability of hydraulic conductivity data and the influence of uncertainty in these data on final management results.