جستجوی مقالات مرتبط با کلیدواژه « Caspian Sea » در نشریات گروه « مهندسی دریا »

The purpose of this paper is to review the background of Iranrood project studies (the project connecting the Caspian Sea to the South Sea) and to examine other inter-sea channels that have been implemented in the world. The idea of this plan was first proposed in the Qajar era and has since then been criticized and many comments have been made about it, but it has not been studied scientifically about the possibility of implementing it scientifically. Undoubtedly the implementation of such a great plan In addition to many benefits such as commercial and shipping revenues and water problems in the desert areas of the eastern part of IRAN, there will also be problems, but given that canals such as Panama, Suez, and Volga-Don have been built and successfully exploited in the world, with the experience and information about the construction of those canals can be used to investigate and implement the Iranrood project.  Many experts have worked on this plan. According to the conclusion of experts' Idea and the history of implementing such large and large plans, the Majlis Research Centr al also considers the realization of this plan possible despite the existing problems and obstacles, and calls for researchers and researchers to study and research in this field .

After the collapse of the Soviet :union:, the Caspian Sea has become a place of competition between newly independent countries, and the quantitative and qualitative increase of modern sea vessels has been one of the actions of these countries. This research is applied in terms of purpose, descriptive in terms of nature, and survey type in terms of the method of collecting and analyzing information. The obtained data has been analyzed in SPSS software platform. The findings of the research show that there is a significant relationship between the level and class of vessels, the quantity and number of vessels, the equipment and facilities of vessels and the improvement of the security of the borders of the Caspian Sea in Mazandaran province. The obtained results show that the Islamic Republic of Iran had the lowest growth rate of military and security expenses in the matter of navigation among the five countries on the shores of the Caspian Sea, while Russia has the best navigation vessels, equipment and facilities and can It should be a good example for the Islamic Republic of Iran in strengthening the buoyancy of the coast guard and the way of controlling and monitoring the Caspian sea borders.

In this paper the generated eddy in the east part of the Sefidrud river, off the Kiashahr in the Guilan province is studied and discussed and also, effects of this eddy on nutrients are considered. Using a vessel-mounted ADCP and a CTD, water current profiles and, physical oceanographic parameters are measured, respectively. The results show that a small scale anticyclone eddy (warm core) is generated in the area that its core had at least 0.5 ℃ temperature difference from surrounding waters. The main current direction was westward and at location of the eddy, changes in current direction are observable. The minimum quantity of nutrients is observed at the eddy core and this means that at study area downwelling phenomenon is occurred.

The possibility of using SAR radar images to detect and measure the sea surface roughnesses, which are mainly caused by winds and water turbulence, has been investigated. Various images of Sentinel-1 SAR radar data in C band and the incidence angle of 39.16 degree were obtained and processed in both VV and VH polarizations to produce images of backscatter coefficient and intensity for Nowshahr maritime region. According to the results, when the average value of backscatter coefficient at VV polarization is 0.00735, the sea surface roughness in Nowshahr region is low and the wave height is 0.9 m. But when this coefficient is 0.034004, the roughness of the sea level is high and the wave height is 2.7 m. Also, the results confirm that the amounts of backscattering from the sea surface near the shore are higher than the offshore areas in the maritime area of Nowshahr.

In this study nickel and vanadium heavy metals were investigated in sediments and gammarus in Gilan Province. Sampling was carried out from sediments and dominant Gammarus, from 5 stations in Gilan province, in the spring of 2016. Nickel and vanadium analysis was carried out using an ICP/MS instrument. The results were statistically analyzed using one-way ANOVA and Duncan's test. The results showed that the amount of vanadium in sediment and Gammarus was higher compared to nickel and more accumulation of both metals was observed in the western part of the province (Rudsar area) compared to the eastern part. There was no significant correlation between environmental parameters and the concentration of metals. Based on the regression equation, a weak positive correlation was found between the amount of nickel and vanadium in sediments and Gammarus, which was not significant. Comparing results with NOAA standard (2004), the amount of nickel and vanadium in the sediments of the coast of Gilan province were not higher than the permissible range.

The main goal of the present study is to use satellite data to extract bathymetry maps of coastlines and especially the shores of the Caspian Sea. For this purpose, the area between the Neka power plant and Amirabad port in Mazandaran province was selected as a pilot. Landsat-OLI satellite image was used to extract the bathymetry map of the study area. Simultaneously with the path of the satellite, about 2700 points from the depths of 2 to 11 meters of the Caspian Sea, was measurement, of which 500 points were used as control points and the rest as training samples. The polynomial linear regression method was used to extract the bathymetry map. Also, a stepwise regression method was used to identify the best regression model and select the best independent variables to estimate the depth. Comparison between the water depth map extracted from the Landsat-OLI satellite image with the control points showed that the RMSE value of this sensor in estimating the coastal water depth was about 0.4 m with an average standard error of 7.6%. By considering the turbidity and roughness of the seawater of Caspian Sea, the obtained result is an acceptable accuracy.

Waves play an important role in the geometry and composition of beaches. Iran has 700 km of coastline with the Caspian Sea, which is important understanding its waves. By reviewing sources, this study provides a comprehensive and analytical knowledge of the waves of Caspian Sea, so that the Caspian waves are wind-driven waves, and the prevailing waves of the southern Caspian are the western waves at first and then the northern waves (with a maximum height of 5.57 m). The maximum wave height is random due to the number of waves reaching the area and break of waves are more of spilling brakers. The exact pattern of the wind field (at the wave heights of 0.5-1.5 m), and the dimensions of the basin under the wind affect the formation of waves. Among the different simulation methods (JONSWAP, CEM, SPM, SMB, MIKE21 model (SW package), regression decision trees method and artificial neural networks) that can be seen in different studies, the last two methods with close answers have double accuracy in compare with others. However, the latter two methods lowerestimate the height of the wind waves slightly and overestimates the wave period slightly in compare with the measurement in South Caspian Sea.