عنوان مقاله [English]
Caspian Sea is the largest lake on earth and its normal surface is lower than the free water level of oceans. It is surrounded by the five countries of Islamic Republic of Iran, Azerbaijan, Russia, Kazakhstan and Turkmenistan. Therefore, this sea is of special economic and political importance for these countries as well as other countries of South Asia. Currently, what has concerned these countries about their coastal lines is the advance of water toward their shores since 1977. In this regard, it has been tried to provide a brief discussion about the fluctuating behavior of the sea to determine whether there have been examples of this behavior with such strength in the past, or it is an exceptional state of water surface behavior. Do these fluctuations follow the rules of cyclical behavior common to other phenomena in the nature?
It is hoped that in this way a solution will be found for problems in coastal protective and preparatory planning. In this article, the relationship between climate change and fluctuating behavior of sea level is examined, and then a pattern for describing this behavior in historical periods is proposed.