الفهرس 
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Abstract
tTushka area represents a small portion of the Western Desert ofEgypt, which is a part of the Sahara Desert. It comprises different
geomorphologic units; Lake Nasser, alluvial plain, Tushka depression,
hilly areas, sandy plain and erosional plains. Eleven lithostratigraphic
sections were measured and sampled from the study area and three
geological cross-sections were constructed. They revealed that the
area consists of a sedimentary succession ranging in age from The
Paleozoic to Quaternary and overlies the Precambrian basement
rocks. Petrographically, the Nubia Sandstones are formed of arenites
and less commonly wackes having well-developed porosity and
permeability. The Nubia Sandstone aquifer system in the studied area
is built up of three water-bearing formations, namely; Gilf, Abu Simble
and Lake Nasser. They are connected directly either laterally or
vertically and range in age from the Paleozoic to the Upper
Cretaceous. In the study area the structural setting plays an important
role in the groundwater configuration. The NW-SE faults are
responsible for the groundwater recharging from Lake Nasser. Local
fault blocks were developed and resulted in the formation of different
types of groundwater aquifers which are laterally and vertically
connected. The obtained results indicate that Nubia sandstone aquifer
system in Tushka- Abu Simbel area receives continuous recharge due
to the difference of heads between the aquifer and the lake. The
hydrogeological impacts of such recent recharge are investigated by
the present work which at the same time confirm the potentials of such
recharge to the Nubia Sandstone aquifer. An increase of the aquifer
saturated thickness associated with the increase of the aquifer
potentials and rising up of the groundwater levels in the area are
defined. The investigated fresh Nile water type mixed with other
groundwater types in storage reflects another sort of the concerned
hydrogeological impacts. The lateral distribution of the natural
isotopes in the groundwater of the aquifer system in the studied area
confirms the potentials of these impacts.