چكيده به لاتين
Recently, remote sensing has been a successful method in marine researches. Because of the difficulties of insitu observations, handling data in harsh weather conditions and errors in measuring devices, remote sensing provides engineers with great help to earn suitable data about oceanic currents. Caspian Sea is a closed basin with limited tidal forces which has density and wind-induced long waves. In this study, the geostrophic currents of Caspian Sea have been obtained using MIKE21 flow model FM and remote sensing for the years 2018 and 2019. The altimeter sensor of the sentinel-3 satellite has been used to obtain data through remote sensing. The currents were gathered and compared for 3 months namely January, April and August, and also the circulation and currents of Caspian Sea has been analyzed. Also, in the modeling, sea currents were obtained at 2018-2019 and compared with the desired results of the three months in the remote sensing. In the middle part of Caspian Sea, a cyclonic pattern (counter clock-wise) has been observed for the majority of the year. This pattern gradually disappeared in summer and was replaced by an anti-cyclonic pattern (clock-wise). In the southern part, two contrary cycles (cyclonic and anti-cyclonic patterns) often existed. The eastern shore of Caspian Sea flows from south to north, the western shore flows from north to south, and flow of the southern shore is from west to east. Finally, by carefully reviewing the monthly results, it was concluded that the currents and cycles of Caspian Sea don’t have a constant patter through out the year but the patterns repeat in different months and seasons of the next years. In other words, the existing pattern through out the year can be considered for the subsequent years. This pattern is useful as long as no significant changes occur in the direction and speed of the prevailing wind regime in Caspian and the discharge of rivers entering it (e.g. the Volga river).
