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El Gammal
EA
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Original Research Article On People Narrow With Agriculture Sewage Water in Closed Oases in Arid Environment, Siwa Oasis, Egypt as a Case Study |
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El Sayed Ahmed El Gammal |
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National
Authority for Remote Sensing and Space Sciences, Cairo, Egypt |
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Abstract |
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The Siwa oasis
sits in a closed structural eroded depression; in North West
Egypt with altitude 18 m below sea level, surrounded by
limestone plateau with altitude to300 m above sea level. This
article postulates the disaster of geo-environmental problem in
both the food and economic delineating the human activities and
the landscape ravine. Aim to rescue Siwa from sinking under
agriculture sewage waters for long life. Hence, deliverance the
continental Nubia sandstone water aquifer under Siwa from
contamination by agriculture sewage and water table rise. Using
of remote sensing and spatial three dimensions models
integrating with geomorphological situation for sewage water
boarding. The current study found that; in case of moving and
extracting the sewage water to the north or the west, the water
will run downward through the limestone fractures again to Siwa
Oasis; the water table in the depression will be raise again
with high calcium carbonate content. In case of moving and
extracting the sewage water to the east where altitude range
from -2 to -6 inside the depression, we will lose a good flat
terrain have old cultivated soil, sabkhas, water bodies,
springs, and mixed soil near to water table ready for
agricultural reclamation. The selected extracting for sewage
water is to the south, in dry valleys and the reservoirs has N-S
trend in flat slope substratum in between the sand dunes in
Great Sand Sea and not covered by sands. The water movement to
the south fixed the movement-sands laying in zero contours which
represent natural hazards. |
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