This paper investigates the changes occurred as a result of the last year (March, 2019) flood in the southern Caspian Sea coasts. To deal with this, some data are collected which was recorded by sentinel 1 in the time of before and after this disaster. The data are processed with different algorithms, filtering and corrections of noise and topography which are obtained from Radar images. The results indicate that the used methods may be suitable to monitor changes in coastal regions when comparing the images with observations. In addition to this, the results show that the eastern parts of the Caspian Sea coasts were under the greatest changes in this period. Simultaneously, analyzing limited cases show that this technique can be beneficial for oceanography proposes, although it should be checked in the future with more detail data including using different polarizations and some extra algorithms for oceanography phenomena.