الفهرس 
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Abstract
The main purpose of the present study is to establish the impact of the global climate change, sea level rise and anthropogenic factors on the groundwater salinization trends due to seawater intrusion.
The area of study lies at the northern part of eastern Nile Delta. It occurs between latitudes 29º 55’ 54.03’’ - 31º 29’ 46.93’’ N and longitudes 31º 3’ 22.69’’- 32º 31’ 39.76’’ E, it is one of the most important developmental areas in Egypt, for its high population density and a prominent watershed having abundant water resources (especially groundwater).
In the present Thesis, the hydrogeological and hydrochemical studies were carried out for the study area. The hydraulic parameters of the Quaternary aquifer were determined by pumping tests of some production wells. Groundwater levels map was constructed by the measured groundwater levels through recent field trips and from the historical data of previous works. Groundwater samples were collected from the observation and production wells tapping the Quaternary aquifer for the purpose of chemical analysis. The resulted hydrochemical data were interpreted by using different hydrochemical softwares for determining the different hydrochemical parameters. The total dissolved solids (TDS) for the Quaternary aquifer in the area of study is varied from 277.5 ppm in Kafr Shokr Well in the southern part (Qalyoubia Governorate) and 35680 ppm in Shirmsah Well in the northern part near El Manzala Lake. Nine water types were differentiated for the Quaternary aquifer according to the analyzed water samples. These water types vary from fresh water types as (Ca-Na-Mg-HCO3 and Na-Mg-Ca-HCO3-Cl-SO4) which occur mainly in the southern parts of the of the study area nearby Ismailia Canal and Damietta Branch, Brackish water types as (Na-Ca-Mg-Cl-HCO3) in the central parts of the study area and saline marine