A microscopic study was done on five samples from the current beach sand at Ra’asShimra beach in order to identify their Foraminifera content and the abundance of the species relative to each other. The micropaleontology analysis showed that the majo
rity of the 17 specified types live on the bottom in shallow marine waters at moderate to hot temperatures. The abundance of the species was noticed in the benthic species such as: Amphistegina, Textularia, and peneroplis, which indicates the availability of suitable environmental conditions for the prosperity of these species, which is close to the current conditions. The samples of sand studied are characterized by their being disjointed, small to medium in size, varying in color, and rich in organic remains, mainly the remains of molluscs, in addition to oval marine-originated stones that vary in size. The X.R.D analysis showed the presence of two phases: a major calcareous phase, and a secondary quartz phase. The study of the thin rock slides taken from rocks located in the region, which can be considered as the source rocks of sand in the study area, showed that it is a sandy limestone.
Concentrations of eight chlorinated pesticides: namely, gamma HCH, Heptachlor,
heptachlore epoxide, aldrin, dieldrin, 4,4-DDE, 4,4-DDD, and 4,4-DDT were studied in
some mollusks species Monodonta turbinata, Brachidontes variabilis , Patella caerule
a,
Trochus erithraeus, Strombus persicus and in sediments taken from five different
locations: Assin estuary, Jobar estuary, Banias Thermal Electricity Station, Albasia, and
Mirkiya River estuary. Sampling was performed at six different times during the period
2006-2007.
Results indicated that Assin estuary contained the highest level of contamination
followed by Jobar estuary and Mirkiya estuary where sampled mollusks species contained
various concentrations of all of the studied pesticides. At Banias Thermal Electricity
Station samples showed contamination with heptachlore and heptachlore epoxide only,
whereas the concentration of pesticides at Albasia location, much lower than the other
locations.
The aim of this study isto determinat the concentration of (Pb, Cu, Cd, Co, Cr , NiZn,
Fe) in storm water and their content of sediments during four seasons, the samples were
collected in four areas along Tartous beach. After make necessary treatme
nt concentrations
of elements determination by flame atomic absorption spectrometry.The results showed a
high levels of elements iron and zinc, in stormwater (138.6 μg/l - 99.7 μg/l) and sediments
(17.863 μg/l – 138.735 ppm), in all samples and there were concentrations another
elements difference between stations and rainfalls related to the human activities.
Water erosion is considered one of the most prominent and dangerous forms of soil erosion, especially in the coastal region, where it rains in large quantities. Consequently, this results in sweeping away tons of soil into the river streams; some of
this will be deposited in the rivers, some in the dam lakes constructed on these rivers, while the rest will be deposited in the sea into which rivers flow. The aims of this study are to calculate the ratio between the amount of sediments related to water erosion of the soil and the amount of the sediments transported in Zgaro River which reach the lake of 16 Tishreen Dam, and to suggest the appropriate solutions which will insure reducing the sedimentation rate and its correlated negative impacts. This study demonstrates the characteristics of the watershed of Zgaro River using Watershed Modeling System (WMS 7.1), and also the calculation of the total amount of sediments related to water erosion of the soil in the area of study, applying the Universal Soil Loss Equation (USLE). The amount of sediments transported by water was also calculated using internationally recognized measuring devices. These devices were manufactured for the purpose of this study. A total of 24886 tons of transported sediments was measured in Zgaro River, constituting 36% of the total annual amount of 69401 tons of sediments resulting from water erosion of the soil. This value comprises the actual amount of sediments deposited in the lake of 16 Tishreen Dam, which is then transported through the river stream. Consequently, this sedimentation has resulted in a downward trend of the reservoir capacity of the dam lake. These findings require feasible solutions to reducing the rate of sedimentation and its correlated negative impacts.
The paper includes in the first stage an estimate of the runoff volume and sediment load,
resulting from rainfall on a watershed of Alkhoser seasonal river, north-eastern Mosul
city/Republic of Iraq, which has an area of up to 725 km2. There is a p
roposal for construction of
a rainwater harvesting dam for the supplementary irrigation in the region which is exploited by
planting wheat and barley crop widely. Digital elevation model (DEM) was adopted in order to
describe the topography of the region, which is one of the main factors affecting the water flow
direction and velocity. It also adopted the daily data of rainfall, maximum and minimum
temperature, for the period 1989 to 2007 for Mosul to estimate the volume of runoff and
sediments resulting from each effective rainstorm. The applied model includes the Geographical
Information System (GIS).
Clay mineralogy of the Miocene successions taken from northern Iraq
constitute an important paleoenvironmental indication for the evolution of
these sediments. Palygorskite is a common mineral especially in the lower
Miocene sediments of Euphrates
formation and the upper detrital part of the
Fat'ha Formation belonging to the middle Miocene. Scanning Electron
Microscope (SEM) study indicated that this mineral, was formed authigenically
by neoformation in suitable chemical conditions within the evaporitic
environments. Other minerals (kaoloinite and illite) have been most probable
formed in detrital system and were preserved in those evaporitic conditions.
Common kaolinites in the Injana clastic Formation (Upper Miocene) as well as
its habit in SEM images are indicators for its detrital origin in such continental
sediments.
Samples of surface sediment of St. Johns River Basin were collected,
extracted and their aliphatic hydrocarbons (AH) were determinated
quantitatively and qualitatively by GC-FID and GC-MS Techniques, were used
to characterize the (AH) hydrocarbons
homologous and biomarker
compounds.The sediments contained high organic matter content, while the
hydrocarbons AH represented ٠,٣٥-٢,٧٢٪ of the total organic matter (TOM)
found in sediments.
