SEDIMENTATION PATTERN OF SOILS SOUTH EL-AMIRIA, ALEXANDRIA GOVERNORATE, EGYPT

The current study aims to identify the sedimentation pattern of soils south El-Amiria, Alexandria Governorate, Egypt. This includes study of grain size parameters, depositional environments and hydrodynamic conditions of these soils. The study area is located between longitudes 29 o 47` 55``and 30 o 30` 05`` East and latitudes 29 o 29` 30`` and 30 o 30` 05`` North and comprise an area of about 571168 Feddan. The area is characterized by two main physiographic units namely Lacustrine plains and Windblown sand. The obtained results indicated that: I. Soils of lacustrine plains appeared that: 1-Grain size parameters as follows:  The fine silt was the predominant constituent of median (Md) as average size.  Graphic mean (Mz), generally, differed from fine to medium and coarse silt.  Measure of uniformity appeared very poorly sorted values (σ1) which indicated that the sediments are transported and deposited by water.  Measure of symmetry cleared that, the sediments have values of strongly coarse skewed (SKI). These values indicate that, the examined sediments have a tail of coarse grains.  Measure of peakedness showed that, the distribution of grains between platy & very platykurtic and lepto & very leptokurtic. 2The depositional environments of lacustrine plain soils were fluvial or deltaic. 3The hydrodynamic conditions, in general, were pelagic suspension (T). II. Soils of windblown sand showed that: 1-Grain size parameters as follows:  Coarse sand was a median (Md) and graphic mean (Mz).  Moderately and moderately well sorted values (σ1) represented the measure of uniformity. This indicated that, sediments are transported and deposited under a combined action of both water and wind.  Strongly fine skewed class was the measure of a symmetry, which indicated that the examined sediments have a tail of fine grains.  Lepto and very leptokurtic were the measure of peakedness. 2-The depositional environment of soil of windblown sand was either fluvial or deltaic. 3-The mechanism of transportation was rolling (N-O).