Soil Conditions of Dakhla Oasis, Western Desert, Egypt
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3.7 Pavement Plain
Pavement plain almost characterized by mixed surface of fragments of gravel, boulders in arid areas and sim arid region in varies geomorphological features and
different level of slope and can recognize in desert areas, fans and also find them in
river terraces that formed during to the Pleistocene Epoch. Pavement plain in Dakhla
Oasis formed by the action of floods, its surface characterized by coarse and medium
sediments materials overlying soil surface
3.8 Playa
Playa are preeminently receptacles for sediment, and water and their nature is in large
measure determined by their old sedimentary and hydrological properties characterized by fine grained clastic and non-clastic sediment (Cook and Warren 1973). Playa
unit is found in low-lying areas in Dakhla Oasis, characterized by the high salinity
of the surface layers, which form a layer or crusts of soluble salts. The surface is
characterized by the high saline water table. The Playa finds in Dakhla Oasis in the
middle of the depression, where the fine clay, silt are mix ed with salt layers and
form Solid layers after the water evaporates, as it is characterized by the presence of
Salt tolerance plants as shown in Fig. 9.
Fig. 9 Playas in Dakhla Oasis. Photo taken by Authors, 2017
133
3.7 Pavement Plain
Pavement plain almost characterized by mixed surface of fragments of gravel, boulders in arid areas and sim arid region in varies geomorphological features and
different level of slope and can recognize in desert areas, fans and also find them in
river terraces that formed during to the Pleistocene Epoch. Pavement plain in Dakhla
Oasis formed by the action of floods, its surface characterized by coarse and medium
sediments materials overlying soil surface
3.8 Playa
Playa are preeminently receptacles for sediment, and water and their nature is in large
measure determined by their old sedimentary and hydrological properties characterized by fine grained clastic and non-clastic sediment (Cook and Warren 1973). Playa
unit is found in low-lying areas in Dakhla Oasis, characterized by the high salinity
of the surface layers, which form a layer or crusts of soluble salts. The surface is
characterized by the high saline water table. The Playa finds in Dakhla Oasis in the
middle of the depression, where the fine clay, silt are mix ed with salt layers and
form Solid layers after the water evaporates, as it is characterized by the presence of
Salt tolerance plants as shown in Fig. 9.
Fig. 9 Playas in Dakhla Oasis. Photo taken by Authors, 2017