الفهرس 
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Abstract
The present study deals with the integration between two geophysical methods
which are the Electromagnetic and the Electrical surveys with the objective of
delineating the conditions of groundwater occurrence in the carbonate rocks. The
investigated area is located in the Northwestern coastal zone of Egypt. It lies
between Longitudes 27º 20 \ to 27º 50\ E and Latitudes 30º 55\ to 31º 24\ N. It is
bounded by the Mediterranean sea in the North and extends for about 20 to 30 km
southwards. It extends from Ras El Hekma in the East to Ras Alam El Roum in the
West. The study area covers about 1200 km2.
The main objective of the present study is to delineate the conditions under which
groundwater occurs by identifying the vertical and horizontal extensions of the
sedimentary succession, especially water bearing formations and the structural
elements (faults) which affect the sedimentary succession and contribute to
groundwater occurrence.
In order to achieve the objective of this work, different geophysical measurements
were carried out in the area. The conducted geophysical measurements include 1-D
resistivity Vertical Electrical Sounding, 2-D resistivity imaging with different
configurations and 3-D resistivity domain). The integrated geophysical data
allowed plausible visualization and detection of the complex geologic and
hydrogeologic settings.
The interpretation of the geophysical measurements reveals the subsurface layering
succession with its horizontal and vertical extensions along with the water bearing
layers. The structural features which affect the area and contribute to groundwater
occurrence have also been delineated. The results are represented in the form of
geoelectrical cross sections and maps. Generally, the interpretation of the
geophysical measurements led to the detection of two main water bearing layers.
The upper one is composed of fractured sandy limestone with a maximum
thickness of about 29m, whereas, the lower water bearing layer is composed of
ABSTRACT II
sand. The lower water bearing layer has been only detected at VES No. 8. The
upper water bearing layer is characterized by relatively higher resistivity than the
lower one which may be attributed to higher water salinity in the lower water
bearing layer.