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1
Content available Stratigraphy and palaeoceanography of late Pleistocene molluscs from the northern coast of the Persian Gulf
Gholamalian Hossein, Hassani Mohammad-Javad, Keshavarz Musa
Geological Quarterly
|
2022
|
Vol. 66, No. 2
art. no. 17
EN
We report an extraordinary discovery of marine Pleistocene strata from the north of the Persian Gulf. The Dayyer section contains a rich molluscan fauna including 26 bivalve species, Sr87/Sr86 data showing that the succession is not older than 153 ka (late Pleistocene). These strata are time-equivalents of the Bakhtiari Formation, but have a very different fossil content and facies. Comparing the Dayyer molluscan community to the present-day fauna of the Persian Gulf shows that many fossil species are absent in the recent waters. The palaeoceanographic distribution of the identified bivalves shows the presence of many of them in the Plio-Pleistocene strata of the Mediterranean Basin. This may point to a temporary connection between the Persian Gulf and Mediterranean Basin during the late Pleistocene and the extinction of many bivalves in the past 153 ka
2
Content available The Effect of Cold Eddy on Acoustic Propagation (Case Study : Eddy in the Persian Gulf)
Mahpeykar Omid, Ashtari Larki Amir, Akbari Nasab Mohammad
Archives of Acoustics
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2022
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Vol. 47, No. 3
413--423
EN
It is essential for oceanographers to study the effects of marine phenomena such as currents, surface mixed layer, eddies, internal waves, and other ocean features on acoustic propagation, as most marine measurement equipment operates on this basis, like sonar. The eddy impact on acoustic transmission in the marine environment is very significant because changes in temperature and salinity disrupt the sound speed due to the presence of eddy, thus the acoustic propagation in the sea. Although cold eddies are in the Persian Gulf widely, one eddy is selected to study their impacts on acoustic propagation because they have similar properties in terms of temperature and salinity. In this research, after identifying eddies in the Persian Gulf automatically, the effect of a cold eddy on acoustic propagation was investigated at different depths using the BELLHOP model. Most eddies are cyclonic with 5–10 km of radius based on algorithm outputs. Studies on the lifespan of eddies showed that the occurrence of cyclonic eddies with a lifespan of more than three days is more than anticyclonic ones. Examination of the eddy effect on acoustic propagation showed that the transmission loss (TL) during the progress of the acoustic wave across the eddy increases with increasing the depth of the sound source. Also, the presence of cold eddy compared to the conditions it does not exist increases the transmission loss. The study of three-dimensional acoustic propagation also confirmed the obtained results in two-dimensional mode and clearly showed the role of cold eddy in increasing the TL.
3
Content available Requirement of a Ship Breaking Yard at the Arvand Free Zone Area
Yousefi H.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2016
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Vol. 10, no. 3
495--500
EN
In this paper, the author is going to investigate the concept of ship recycling which implies to the materials and equipment including end of ships life. The scraped steel is melted down and is commonly used in the construction industries of ship recycling countries, and some equipment might be re-used in other industries too. A segment of this paper is dedicated to describe about the strategic position of Arvand River and the location of Arvand Free Zone area at the Persian Gulf. It should be noted that ship recycling commonly takes place in developing countries which tend to have a competitive advantage due to the low cost labor, may have weaker environmental protection / worker health and safety regulations, and have national demand for the outputs of the activity. The International Maritime Organization (IMO) adopted the Hong Kong International Convention related to the safety and environmental sound recycling of ships to address the growing about the environment, job health and safety risks related to ship recycling. A part of this paper dedicated to review the role of the Hong Kong Convention in order to ensure the process of ship recycling without risks to human health and to the environment. The main part of this paper is designated to evaluate the role of establishment of a ship scraping yard at the Arvand Free Zone Area, its market at the Persian Gulf and improving the safety of navigation at the Arvand River. The research methodology of this paper will be designated to consider the qualitative part of this research by using interview with the experts in order to find out and select the key factors for further consideration; as a result of that a model will be created which can be tested by a questioner. In addition to the above explanation, relationship between the variables and testing hypothesizes of this research will be analyzed by using SPSS and Lisrel software as quantitative part of this research.
4
Content available remote Shallow gas accumulations and seepage in the sediments of the Northeast Persian Gulf
Hosseinyar G., Moussavi-Harami R., Behbahani R.
Acta Geophysica
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2014
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Vol. 62, no. 6
1373--1386
EN
Shallow gas accumulations and gas seepage may indicate deeper hydrocarbon reservoirs. Sonar and high resolution seismic recordings were carried out to obtain gas migration and accumulation below seabed in Northeast Persian Gulf. Results revealed some structures and reflectivity effects, for example few pockmarks, gas seepage, and other surface structures in sonar and seismic data. Most of the features observed on seismic data were located at depths between 5 and 10 m (sub-sea bed) that include acoustic blanking and turbidity, gas packets, gas chimneys, and enhanced reflection. Most of the gas is accumulated on young and thin parallel layers, but the presence of acoustic effect in Aghajari Formation indicates that the origin of the gas accumulation in shallow strata may be located in a deeper reservoir.
5
Content available Distribution of total petroleum hydrocarbons and polycyclic aromatic hydrocarbons in Musa Bay sediments (northwest of the Persian Gulf)
Tehrani G. M., Hashim R., Sulaiman A. H., Sany S. B. T., Salleh A., Jazani R. K., Savari A., Barandoust R. F.
Environment Protection Engineering
|
2013
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Vol. 39, nr 1
115--128
EN
Sediment samples were collected from the coastal area of the Petrochemical Special Economic Zone of Musa Bay. The samples were analyzed to determine the degree of hydrocarbon contamination and identify the sources of PAHs which were evaluated by employing the ratios of specific PAHs compounds and principal component analysis (PCA). The levels of TPH concentration in the studied area were relatively moderate compared to the world-wide chronically oil-contaminated locations. The concentration of total PAHs was lower than those in other parts of the Musa Bay but approached the NOAA sediment quality guideline value.
6
Content available I wojna w Zatoce Perskiej : wojna sieciocentryczna czy klasyczny konflikt zbrojny ery przemysłowej ?
Wójtowicz Tomasz
Wiedza Obronna
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2012
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nr 4
3--14
7
Content available remote Geological importance of luminescence dates in oman and the Emirates: an overview
Glennie K. W., Fryberger S. G., Hern C., Lancaster N., Teller J. T. J. T., Pandey V. P., Singhvi A. K.
Geochronometria
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2011
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Vol. 38, no. 3
259-271
EN
In the Wahiba Sands of eastern Oman, luminescence dating of sands enables us to relate wind activity to climatic variations and the monsoon cycle. These changes resulted from Polar glacial/interglacial cyclicity and changes in global sea levels and wind strengths. Luminescence dates show that development of the Sands began over 230 ka ago when the sand-driving winds were the locally arid, northward-blowing SW Monsoon. During late Quaternary low sea levels, the Tigris-Euphrates river system flowed across the floor of the Persian/Arabian Gulf to the Gulf of Oman SE of the Strait of Hormuz. OSL-dated sands containing calcareous bioclastic fragments deflated from the exposed Gulf floor during glacial low-water periods indicate that during the last glacial cycle, and at least one earlier cycle (~120-200 ka and possibly as far back as 291 ka), the floor of the Arabian Gulf was exposed. This is deduced from the presence of aeolian dune sands containing bioclastic detritus on the coastal plain of the Emirates and south into Al Liwa (Abu Dhabi), which were built by northern "Shamal" winds. Those calcareous sands now locally overlie sabkhas formed during interglacial high sea levels. Within the present in-terglacial, marine flooding of the Gulf occurred between about 12 and 6 ka.
8
Content available remote Echinoids and pectinid bivalves from the Early Miocene Mishan Formation of Iran
Kroh A., Gholamalian H., Mandic O., Ćorić S., Harzhauser M., Reuter M., Piller W.
Acta Geologica Polonica
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2011
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Vol. 61, no. 4
419-439
EN
Shallow marine echinoids and pectinid bivalves from the Early Miocene Guri Member of the Mishan Formation cropping out at the Gery Sheikh section north of Bandar Pohl in the area of the Hormuz Strait, Iran, are reported. The echinoid fauna indicates a Burdigalian age for the Guri Member. This is supported by new calcareous nannoplankton data from this unit, which suggest an age from Aquitanian to middle Burdigalian (NN1-NN3). From a palaeobiogeographic point of view the fauna of the Guri Member is related to the faunas from central Saudi Arabia, southeast Pakistan and northwest India. The absence of Western Tethyan elements supports earlier data suggesting that a faunal separation between Proto-Mediterranean and Proto-Indian Ocean faunas was well developed before the terminal Tethyan Event. The echinoids Fibularia damensis Kier, 1972 and Anisaster arabica Kier, 1972 are new records for Iran, having been known before solely from Saudi Arabia. Brissus daviesi Jain, 2002 is transferred to Rhynobrissus based on the characters of its fascioles, petalodium and plas tron; this constituting the first fossil record of the genus.
9
Content available Wpływ irańskiego programu nuklearnego na region Bliskiego Wschodu
Otłowski Tomasz
Wiedza Obronna
|
2010
|
nr 3
23--30
10
Content available remote Zasada wolności mórz a wojna na morzu
Otłowski T.
Wiedza Obronna
|
2001
|
nr 3
19--24
11
Content available remote Obrona przed rozpoznaniem i uderzeniami z powietrza : rys historyczny
Jauer T.
Wiedza Obronna
|
2001
|
nr 3
120--156
12
Content available remote Obrona przed rozpoznaniem i uderzeniami z powietrza : doświadczenia z wojny w Zatoce Perskiej
Jauer T.
Wiedza Obronna
|
2001
|
nr 4
43--65
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