الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
The essence of this research is to bridge the gap between the theoretical and the practical application of groundwater modelling in relation to salt water intrusion problems. This involves investigating the effect of pumping wells on the response of the interface (sharp or dispersive) between salt water.andjresh water. Numerical models have been used in this respect to studv various parameters, including those required to model extensive pumping originating from dewatering s\’Stems. permeability coefficients of the leakage parameter and dispersivit A combination of a trial and error method and an automatic calibration method for parameter optimisation has been utilised In calibrating both areal two dimensional and three dimensional models. Location and shape of the transition zone in the Nile Delta aquifer has been studied. The thesis. orf!anised in seven chapters. gives a concise summary of the theory and application of the numerical mOdels relating to salt water intrusion and a description of the work associated with the solution of two real problems. A brief introduction highlighting the imponance of the study of salt water intrusion is presented in the first Chapter. The second Chapter describes the sharp and dispersive interface approaches which have been used to represent the interaction between saline and fresh groundwater and it tnen sets salt intrusion modelling in its historical context. A review of previous studies undenaken in Egypt on salt water intrusion phenomena is also presented. This is folio wed in the third Chapter by a description of a quasi-three dimensional finite element model that has been developed to locate the sharp interface in the case of group of wells with different arrangements both in confined and unconfined aquifers. The effects of different well discharges. location. and arrangements on the shape and location of the interface has been investigated in lea!..!! aquifers for a stead ••. state. Location of hinge point has been also studied.
A review of two selected density dependent solute transpon modelling problems in porous media is presented in the fourth. Chapter . Some modifications to the models have been introduced to accommodate leakage problems. Parameter optimisation has been supplement by the use of an automatic calibration. Sensitivity analysis has been performed to study the main features of two dimensional and three dimensional models when they are applied to a selected problem.
The two numerical models, presented in chapter four, have been used to investigate the effect of the dewatering process during the different stages of a construction project. The results are presented in hapter .li.”e. Chapter six explores the salt water intrusion phenomenon in the Nile Delta aquifer by using a three dimensional finite element programme. Finally, chapter seven is devoted to the conclusions and recommendations for future work.